Vegetable Production Guide

Potatoes
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Table 3 Potato Disease Control

This section was updated - 11 September 2021
Table 3 Potato Disease Control
Group

Product

Rate

PHI*

Comments

Early and Late Blight Control
M
(chloronitrile)

Bravo 500

(chlorothalonil)

Early Blight:
1.6 to 2.4 L/ha
(0.6 to 1.0 L/acre

Late Blight:
1.2 to 2.4 L/ha
(0.5 to 1.0 L/acre)
1
  • Apply every 7 to 10 days.
  • Use the higher rate for the 10 day interval.
  • This is the preferred product for Interior areas where early blight is a serious problem.
  • Do not enter treated area for 48 hours.
  • Do not apply Echo 90 DF more than 12 times per season.

Echo 90DF

(chlorothalonil)

Early Blight:
0.9 to 1.3 kg/ha
(400 to 500 g/acre)

Late Blight:
0.7 to 1.3 kg/ha
(300 to 500 g/acre)

Echo 720

(chlorothalonil)

Early Blight:
1.1 L/ha
(400 mL/acre)

Late Blight:
0.8 to 1.7 L/ha
(300 to 700 mL/acre)
M
(phthalimide)

Maestro 80 DF

(captan)

2.5 to 3.75 kg/ha
(1.0 to 1.5 L/acre)
7
  • Use sufficient water volume to obtain thorough coverage.
  • Begin treatment when conditions are favourable for disease.
  • Repeat at 7 to 10 day intervals.
  • Do not apply more than 7 times per season.
  • Do not enter treated area for 48 hours.

M

(dithiocarbamate)

Dithane DG
Rainshield NT

(mancozeb)

1.1 to 2.25 kg/ha
(450 to 900 g/acre)
1
  • Use low rate when plants are 10 to 15 cm high, increase to 1.75 kg/ha (0.7 kg/acre) as plant size increases, and use high rate at row closure.
  • Repeat at 7 to 10 day interval.
  • During periods of wet weather favouring late blight and/or vigorous crop growth, spray intervals may be reduced to 5 to 6 days using the medium rate after row closure until conditions allow return to the regular spray schedule.

Dithane F-45

(mancozeb)

1.8 to 3.8 L/ha
(0.7 to 1.5 L/acre)
1
  • Use low rate when plants are 10 to 15 cm high, increase to 3.0 L/ha (1.2 L/acre) as plant size increases, and use high rate at row closure.
  • Repeat at 7 to 10 day intervals.
  • During periods of wet weather favouring late blight and/or vigorous crop growth, spray intervals may be reduced to 5 to 6 days using the medium rate after row closure until conditions allow return to the regular spray schedule.

Penncozeb 75DF

(mancozeb)

1.1 to 2.25 kg/ha
(450 to 900 g/acre)
1
  • Apply every 7 to 10 days, shorten to 5 to 6 days if conditions are severe.
  • Apply 1.1 kg/ha when plants are 10 to 15 cm high, increase to 1.75 kg/ha as plant size increases, and to 2.25 kg/ha at row closure.
  • Begin applications early using the low rate and increasing as the vines increase in size.
  • Do not enter treated area for 24 hours.

Penncozeb 75DF Raincoat

(mancozeb)

M
(dithiocarbamate)

Polyram DF

(metiram)

1.1 to 1.75 kg/ha
(450 to 700 g /acre)
1
  • Apply at 7 to 10 day intervals using 1.1 to 1.75 kg/ha (0.45 to 0.7 kg/acre) until plants cover the row.
  • Use 1.10 to 1.75 kg/ha (0.45 to 0.7 kg/acre) at 5 to 7 day intervals starting when plants are 15 cm high and continuing until top killing.

Manzate DF

(mancozeb)

1.1 to 2.24 kg/ha
(450 to 900 g/acre)

Apply in 200 to 1000 L/ha (80 to 405 L/acre) of water
1
  • Apply 1.1 kg/ha when plants are 10 to 15 cm high, increase to 1.75 kg/ha as plant size increases, and to 2.25 kg/ha at row closure.
  • Apply at 7 to 10 day intervals.
  • During periods of wet weather favourable for disease development, spray intervals may be reduced to 5 to 6 days.

4 M
(acylamines/

dithiocarbamate)

Ridomil Gold/

Bravo Twin Pak

(metalaxyl-M/ chlorothalonil)

Ridomil MZ 68 WP

(metalaxyl/ mancozeb)

See label for specific rates
 
  • Due to widespread resistance development in BC, these products may not effectively control blight. They are recommended for suppression of leak and pink rot (see Pythium Leak and Pink Rot section of this table).
  • Do not contaminate water.
  • Do not use on gravelly soils, soils with a high water table or less than 2% organic matter.
  • Do not tank mix with a top-killer.

11 M2

(strobilurin/

dithiocarbamate) 

Cabrio Plus

(pyraclostrobin/

metiram)

2.25 to 3.35 kg/ha
(0.91 to 1.36 kg/acre)
 
Apply in 200 L/ha (80 L/acre) of water. 
3
  • For early blight apply on a 7 to 14 day interval.
  • For late blight apply on a 7 to 10 day interval.
  • Do not apply more than 3 times per season.
  • Do not enter treated area for 12 hours.
  • Observe a plantback interval of 14 days for all crops not listed.
  • Crop can be fed or grazed to livestock.

11
(strobilurin)

Headline EC

(pyraclostrobin)

450 to 670 mL/ha
(200 to 270 mL/acre)
3
  • For late blight, apply at 5 to 7 day intervals.
  • For late blight, tank mix with Bravo 500 or Polyram DF.
  • For early blight at 7 to 14 day intervals.
  • No more than two consecutive applications before alternating to a fungicide with a different mode of action.
  • Do not apply more than 3 times per season.
  • Do not enter treated area for 12 hours.
11
(strobilurin)

Reason 500SC

(fenamidone)

Plus:

Dithane DG

Rainshield NT

(mancozeb)

Or

Bravo 500

(chlorothalonil)

200 mL/ha
(81mL/acre)

Plus:

1.25 kg/ha
(500 g/acre)


Or

1.25 L/ha
(500 mL/acre)
14
  • Begin application when plants are 15 to 20 cm high, or when disease threatens (whichever comes first).
  • Tank mix with Dithane DG or Bravo 500.
  • Do not apply more than 6 times per year.
  • Observe a 30 day plant back interval for all crops.
  • Do not enter treated area until residues have dried.

11 U
(strobilurin/

miscellaneous)

Tanos 50 DF

(famoxadone /

cymoxanil)

560 to 840 g/ha
(224 to 326 g/acre)

Apply in at least 250 L/ha (100 L/acre) of water
14
  • Maximum of 6 applications per year.
  • Make the first application of Tanos following one or two applications of a preventative, broad spectrum fungicide such as chlorothalonil or mancozeb.
  • Apply at 7 day intervals.
  • Observe a minimum plant back interval of one year for crops not on the label.
  • Do not enter treated area for 24 hours.
  • Harmful to beneficials.
  • Do not apply to stressed plants.

22
(benzamide)

 

 

M
(dithiocarbamate)

 

22
(benzamide)

 

 

 

M
(dithiocarbamate)

Zoxium 80W

(zoxamide)
 

Plus:

Dithane DG

Rainshield NT

(mancozeb)
 

Or

Zoxium 80W

(zoxamide)
 

Plus:

Dithane DG

Rainshield NT

(mancozeb)

175 g/ha
(70 g/acre)

 
 
Plus:

1.5 kg/ha
(600 g/acre)


 
Or

235 g/ha
(94 g/acre)

 
 
Plus:

2.0 kg/ha
(800 g/acre)
3
  • Always tank mix with Dithane DG.
  • Repeat at 7 day intervals.
  • Maximum of 6 applications per season.
  • A 30 day plant back interval (PBI) is required for leafy vegetables and root and tuber vegetables. For all other crops not included on the label, the PBI is 140 days.
  • Do not enter treated area for 48 hours.

22 & M3
(dithiocarbamate/

benzamide)

Gavel DF

(mancozeb / zoxamide)

Late blight:
2.25 kg/ha
(900 g/acre)

Early blight:
1.7 kg/ha
(700 g/acre)
3
  • Repeat at 7 day intervals.
  • Maximum of 6 applications per season.
  • A 30 day plant back interval (PBI) is required for leafy vegetables and root and tuber vegetables. For all other crops not included on the label, the PBI should be 140 days.
  • Do not enter treated area for 48 hours.
M
(inorganic)

Parasol F

(copper hydroxide)

0.8 to 1.8 L/ha
(320 to 720 mL/acre)
1
  • Combine with 1.75 to 2.25 kg/ha (700 to 900 g/acre) mancozeb 80%.
  • Apply at 7 to 10 day intervals, starting when plants are 15 cm high.
  • Maximum 10 applications per season.
  • Apply at vine kill with a desiccant, or alone after vine kill at 2.4 L/ha (960 mL/acre). This may prevent late blight infection of tubers during harvest.

Kocide 2000

(copper hydroxide)
 
Used in organics.
0.8 to 1.6 kg/ha
(300 to 350 g/acre)
1
  • Apply at 7 to 10 day intervals, starting when plants are 15 cm high.
  • Apply 2.4 kg/ha (1 kg/acre) at vine kill with a desiccant or just prior to harvest. This may reduce Late Blight infection of tubers during harvest.
  • Can be combined with Manzate DF at 1.75 to 2.25 kg/ha (700 to 900 g/acre).
  • Kocide 2000 (PCP# 27348) is OMRI-Canada listed.  Check with your certification body before using in an organic operation.

Copper Spray

(Fixed Copper)

4.0 kg/ha
(1.6 kg/acre)
1
  • Apply every 7 to 10 days beginning when plants are 10 to 20 cm high, increasing the rate as the vines increase in size.
  • Apply in 1000 L of water per hectare (405 L of water per acre).
  • Maximum 10 applications per season.
  • Do not enter treated area for 48 hours.

Copper Oxy-chloride 50

(copper hydroxide)

Copper 53W

(tri-basic copper sulphate)

3.8 kg/ha
(1.5 kg/acre)
1
  • Apply when plants are 12 to 18 cm high.
  • Repeat at 7 to 10 day intervals.
  • Maximum 10 applications per season.

Cueva

(copper octanoate)

Group M1

Use a 0.5%  to 2%  solution at 470 to 940 L/ha (190 to 380 L/acre)
1
  • For a 0.5% solution, mix 1 part Cueva to 200 parts water.
  • For a 2% solution, mix 1 part Cueva to 50 parts water.
  • Repeat at 7 to 10 day intervals.
  • Repeat at 5 to 7 day intervals following heavy rain or when disease pressure is high.
  • Do not make more than 15 applications per year.
  • Time applications so that 12 hours of dry weather follow application.
  • Do not re-enter treated area for 4 hours.
Late Blight Control Only
(biofungicide)

Timorex Gold

(tea tree oil)
 
Used in organics.
2.25 L/ha
(910 mL/acre)
 
Apply in 200 to 400 L/ha (80 to 160 L/acre) of water.
2
  • Suppression only.
  • Apply as a foliar spray until runoff.
  • Repeat using a 7 to 14 day interval.
  • Do not apply with captan or sulphur.
  • Timorex Gold (PCP# 30910) is OMRI-Canada listed.  Check with your certification body before using in an organic operation.

21
(benzamide)

Ranman 400SC

(cyazofamid)
100 to 200 mL/ha
(40 to 80 mL/acre)
7
  • Tank mix with Sylgard 309 at 150 mL/ha (60 mL/acre).
  • Repeat at 7 day intervals.
  • Do not apply more than 6 times per year.
  • Use the high rate for the last 2 or 3 applications prior to dessication.
  • Do not enter treated area for 12 hours.
  • Observe plant back interval of 30 days.

 

27
(cyamoxanil)

 

M
(dithiocarbamate)

Curzate 60 DF

(cymoxanil)

Plus: 

Manzate DF

(mancozeb)

225 g/ha
(90 g/acre)

Plus:

1.35 to 1.6 kg/ha
(0.5 to 1.6 kg/acre)
8
  • Apply as a tankmix in 200 to 1000 L/ha (80 to 405 L/acre) of water.
  • Repeat every 5 to 7 days.
  • Do not apply more than 7 times per season.
  • Do not apply within 2 hours of rainfall.
  • Do not re-enter treated area for 24 hours.

28 M

(carbamate/

chloronitrile)

Tattoo C

(propamocarb HCl &

chlorothalonil

Note:  No longer produced. 

2.7 L/ha
(1.1 L/acre)

Apply in 200 to 300 L/ha (80 to 120 L/acre) of water.
7
  • Repeat at 7 to 14 day intervals.
  • Do not apply more than 3 times per season.
  • Wait a minimum of 7 days after treatment before applying any product containing chlorothalonil (i.e. Bravo, Echo).
  • Do not re-enter for 48 hours after treatment.  If required, re-entry is permitted within 48 hours of treatment for short term tasks not involving hand labour provided that 4 hours have passed since application and that long pants and a long-sleeved shirt are worn.
  • Observe a plantback interval of 30 days for root and leafy vegetables and 120 days for winter wheat and all other crops not on the label.

29

(pyradinamine)

Allegro 500F

(fluazinam)

400 mL/ha
(160 mL/acre)
14
  • Spray volumes vary with plant growth, see label.
  • Begin applications when plants are 15 to 20 cm tall or when conditions favour disease development.
  • Repeat using a 7 to 10 day interval.
  • Do not make more than 10 applications per year.
  • Do not make more than 3 sequential applications before alternating to a fungicide with a different mode of action.
  • Do not enter treated area for 24 hours.
  • Areas treated may be replanted to potatoes as soon as practical. For other root crops and leafy vegetables, observe a 30 day plant back interval (PBI). For all other crops the PBI is 70 days.

33

(phosphonate)

Confine Extra        

(mono- and di-potassium

salts of phosphorous acid)

Foliar: 
5 to 10 L/ha  
(2.0 to 4.0 L/acre)
 
Apply in 100 L/ha (40 L/acre) of water.
1
  • Suppression of late blight and pink rot.
  • Repeat using a 7 to 14 day interval.
  • Do not make more than 5 applications per growing season.
  • Tankmixing with pesticide products containing a metal base and/or micronutrients may not be compatible and could potentially cause plant injury.  See label for details.

Phostrol

(mono- and dibasic sodium, potassium, and ammonium phosphites)

Foliar: 
2.9 to 11.6 L/ha
(1.2 to 4.7 L/acre)
 
Apply in 200 L/ha (80 L/acre) of water.
0
  • Apply as a foliar spray on a 7 to 14 day interval.
  • Do not make more than 7 applications in a season.
  • May be applied as a tankmix with Bravo 500 or Echo 720 or Echo 90DF or Ridomil Gold/Bravo Twin Pack or Dithane F-45 or Dithan DG 75 or Dithan DG Rainshield NT or Gavel 75DF or Penncozeb 75 DF.  Read and follow the use directions including PHI and re-entry interval on the individual product labels.
  • Do not re-enter treated area for 12 hours.
0.42 L water to 1 tonne tubers
N/A
  • Post-harvest control of late blight and pink rot.
  • Apply directly to tubers.
  • Ensure complete coverage.
  • Do not re-enter treated area for 12 hours.

Confine

(mono- and di-potassium

salts of phosphorous acid)

Post-harvest:  dilute at a 1:4.3 ratio with water

N/A

  •  Post-harvest storage treatment.
  • Suppression of late blight, pink rot and silver scurf.
  • NOT RECOMMENDED FOR USE ON SEED POTATOES.
  • Apply 2 L of this solution as a spray to 1000 kg of potatoes prior to storage.
  • Ensure thorough coverage.

Confine Extra        

(mono- and di-potassium

salts of phosphorous acid)

Post harvest:  dilute at a 1:5.13 ratio with water
 
(equivalent to 326 mL product mixed with 1674 mL water to treat 1000 kg potatoes)

 

Rampart

(mono- and dipotassium

salts of  phosphorous acid)

 N/A

Post-harvest:  dilute 190 mL of product in 1 L of water
  • Post-harvest storage treament.
  • Also controls pink rot.
  • Do not apply more than once per year.
  • Apply as soon as possible after harvest.
  • Prior to storage:  Apply 2 L of solution as a spray rinse to 1000 kg of harvested tubers prior to storage.
  • Stored potatoes:  Inject 2 L of solution per 1000 kg of stored tubers into water used for the post-harvest storage humidification system.

40

(carboxylic acid

amide)

Revus

(mandipropamid)

400 to 600 mL/ha
(160 to 240 mL/acre )
14
  • Use a non-ionic adjuvant (0.25% v/v).
  • Repeat at 7 to 10 day intervals.
  • Do not apply more than 4 times per year.
  • May be tank-mixed with Bravo 500. Check Bravo Label for re-entry intervals.
  • Apply in at least 100 L/ha (40 L/acre) of water
  • Do not enter treated area for 12 hours.

Forum

(dimethomorph)

450 mL/ha
(182 mL/acre)
 
For concentrated sprays:
apply in 50 to 100 L/ha (20 to 40 L/acre) of water. 
 
For diluted sprays:
apply in 225 to 1600 L/ha (90 to 645 L/acre) of water.
4
  • Must be tank mixed with either: Polyram DF, Dithane DG Rainshield NT, or Bravo 500 (see labels). Follow the most restrictive applications directions for number of applications, timing, PHI*, plantback interval, re-entry and buffer requirements.
  • Under high level of blight infection apply after topkill to reduce tuber blight.
  • Repeat using a 5 day interval.
  • Do not apply more than 3 times per season.

43

(acylpicolide)

Presidio

(fluopicolide)

220 to 292 mL/ha
(89 to 118 mL/acre)
 
Apply in 200 to 500L/ha (80 to 200 L/acre) of water.
7
  • Tank-mix with a product that has a different mode of action listed in this table for late blight, such as Bravo 500. Follow most restrictive directions including rate, PHI and re-entry interval.
  • Repeat using a 7 to 10 day interval.
  • Do not make more than 4 applications per season.
  • Maximum of 880 mL/ha (356 mL/acre) per season.
  • Do not combine in-furrow/soil applications with foliar applications of Presidio.
  • Do not enter treated area for 12 hours.
  • Also controls pink rot when used in-furrow or as a soil application.  See Pythium Leak and Pink Rot section of this table for details.

45 & 40

(triazolopyrimidylamine/

carboxylic acid amide)

Zampro

(ametoctradin &

dimethomorph)

0.8 to 1.0 L/ha
(300 to 400 mL  /acre)

Apply in 200 L/ha (80 L/acre) of water.
4
  • Repeat at 5 to 10 day intervals.
  • Do not apply more than 3 times per season.
  • Use a spreading/penetrating  adjuvant.
  • For reduction in tuber blight, use the high rate immediately prior to or after vine kill.
  • Do not re-enter for 12 hours.
  • Observe a plantback interval of 30 days for all crops not on the label.

49

 

Orondis

(oxathiapiprolin)

120 to 350 mL/ha
(49 to 140 mL/acre
 
Apply in 110 L/ha (45 L/acre) of water.
5
  • Repeat at 7 to 14 day intervals.
  • Do not use following a soil application of Orondis (see Suppression of Pythium Leak and Pink Rot section of this table).
  • Where multiple crop cycles are produced in the same year, do not make more than 6 applications/ha/year.
  • Do not apply more than 1.40 L/ha (570 mL/acre) per season.
  • Do not re-enter treated area for 12 hours.
  • Also suppresses Pink rot (see Suppression of Pythium Leak and Pink Rot section of this table).
Early Blight Control Only
(biological)

Serenade Opti

(Bacillus subtilis)

Used in organics.

1.1 to 2.2 kg/ha
(450 to 900 g/acre)
0
  • Suppression only.
  • Repeat using a 7 to 10 day interval.
  • Serenade Opti & Serenade Max (PCP# 31666, 28549) are OMRI-Canada listed.  Check with your certification body before using in an organic operation.

Serenade Max

(Bacillus subtilis)

Used in organics.

Note:  no longer produced.

 

2.0 to 4.0 kg/ha
(0.8 to 1.6 kg/acre)

3

(triazole)

Quash

(metconazole)

175 to 280 g/ha
(70 to 115 g/acre)
 
Apply in 200 L/ha (80 L/acre) of water
1
  • Repeat using a 7 to 14 day interval.
  • Do not make more than 3 applications at the high rate or more than 4 applications at the low rate.
  • Do not apply more than 840 g/ha (340 g/acre) per season.
  • Application should not be made if rain is expected within 2 hours of application.
  • Observe a 30 day plantback interval for all crops not listed on label.
  • Do not re-enter treated area for 12 hours.

7
(pyridine-

carboxamide)

Lance WDG

(boscalid)

175 to 315 g/ha
(170 to 126 g/acre)

Apply in at least 100 L/ha (40 L/acre) of water.
30
  • Repeat at 14 day intervals.
  • Maximum of 4 applications per season.
  • No more than two consecutive applications before alternating to a fungicide with a different mode of action.
  • Do not enter treated area for 12 hours.
  • For crops not on the label, observe a plant back interval of 14 days.

Cantus WDG

(boscalid)

7

(carboxamide)

Vertisan

(penthiopyrad)

1 to 1.75 L/ha
(400 to 700 mL/acre)
Apply in 110 L/ha (45 L/acre) of water
7
  • Suppression only.
  • Repeat at 7 to 14 day intervals.
  • Do not apply more than 5 L/ha (2 L/acre) per season.
  • Do not re-enter treated area for 12 hours.

7

(pyridinyl-ethyl-

benzamide)

Luna Privilege

(fluopyram)

150 to 300 mL/ha
(60 to 120 mL/acre)
7
  • Repeat at 7 to 12 day intervals.
  • Do not apply more than 800 mL/ha (325 ml/acre) per season.
  • Observe a plantback interval of 30 days for cereals and corn.
  • Do not enter treated area for 12 hours.

7

(carboxamide (SDHI))

Sercadis

(fluxapyroxad)

167 to 333 mL/ha
(68 to 135 mL/acre)

Apply in 100 L/ha (40 L/acre) of water
7
  • Use with a non-ionic surfactant (0.125% v/v).
  • Repeat at 7 to 14 day intervals.
  • Do not make more than 3 applications per season.
  • Do not apply more than 1.0 L/ha (405 mL/acre) per season
  • No more than 2 consecutive applications before alternating with a fungicide with a different mode of action.
  • Do not enter treated area for 12 hours.
  • For crops not listed, observe a plantback interval of 1 year.
  • Also controls Rhizoctonia canker when applied in-furrow at planting.  See Soil-Borne Diseases and Nematodes section of this table. 

3 & 7

(amide/triazole)

Aprovia Top

(benzovindiflupyr/

difenoconazole)

643 to 967 mL/ha
(260 to 391 mL/acre)
 
Apply in 150 L/ha (60 L/acre) of water.
14
  • Apply as a foliar spray.
  • Repeat using a 7 to 14 day interval.
  • Do not make more than 4 applications per season.
  • Do not apply more than 3.9 L/ha (1.6 L/acre) per season.
  • Observe a plantback interval of 60 days for sweet corn and 6 months for crops not listed.
  • Do not re-enter treated area for 12 hours.

9

(anilnopyrimidine)


(chloronitrile)

Scala SC

(pyrimethanil)

Plus: 

Bravo 500

(chlorothalonil)

750 mL/ha
(305 mL/ acre)

Plus:

1.6 to 2.4 L /ha
(650 to 970 mL/acre)
7
  • Begin applications when plants are 15 to 20 cm tall, or when disease threatens (whichever comes first).
  • Repeat at 7 day interval.
  • Do not apply more than 6 times per year.
  • Wheat may be planted 30 days following the application of Scala SC.
  • For all crops not listed on the label, observe a plant-back interval of 30 days.
  • Apply in 300 L/ha (121 L/acre) of water.
11
(strobilurin)

Quadris F

(axosystrobin)

500 to 800 mL/ha
(200 to 300 mL/acre)
1
  • Also controls black dot.
  • Do not use when late blight is present.
  • Repeat applications at 7 to 14 day intervals.
  • Do not make more than 3 applications per season.
  • Do not re-enter treated area for 12 hours.
  • Can also be tank-mixed with 2 L/ha (800 mL/acre of Bravo 500.
  • Observe a plant back interval of 30 days for potatoes and other root crops.

11 & 3

(strobilurin/

triazole)

Quadris Top

(azoxystrobin/

difenoconazole)

566 to 1000 mL/ha
(229 to 405 mL/acre)
 
Apply in 150 L/ha (60 L/acre) of water.
14
  • Also controls black dot.
  • Do not apply more than once for black dot.
  • Repeat at 7 to 14 day intervals for early blight.
  • Do not make more than 3 applications per year.
  • Do not re-enter treated areas for 12 hours.
  • Observe a plant back interval of 60 days for all crops not registered on this label or the Inspire label.

11 & 7

(amide/

strobilurin)

Elatus

(benzovindiflupyr/

azoxystrobin)

417 to 500 g/ha
(169 to 204 g/acre)
 
Apply in 150 L/ha (60 L/acre) of water.
14
  • Also controls black dot.
  • Apply as a foliar spray.
  • Repeat at 7 to 14 days.
  • Do not make more than 3 applications per season.
  • Do not apply more than 1.5 kg/ha (0.6 kg/acre) per season.
  • Observe a plantback interval of 6 months for crops not listed.
  • Also controls soil-borne diseases at planting.  See Soil-Borne Diseases and Nematodes section of this table for details.
19
(polyoxin)

Diplomat 5SC /

Polyoxin D Zinc Salt 5SC

(polyoxin D zinc salt)
537 to 926 mL/ha
(217 to 375 mL/acre)
0
  • Suppression only.
  • Repeat using a 7 to 14 day interval.
  • Do not apply more than 2.8 L/ha (1.1 L/acre) per season.
44

Double Nickel 55

(Bacillus amyloliqufaciens strain D747)

0.5 to 2 kg/ha
(200 to 810 g/acre)
 
For smaller plants or low disease pressure:  
0.5 to 1 kg/ha
(200 to 400 g/acre)
0
  • Suppression only.
  • Apply as a foliar spray at row closure to tuber formation.
  • Repeat at 3 to 10 day intervals.
  • Do not use highly alkaline or highly acidic water to mix sprays.
  • If necessary, use a buffering agent to maintain a pH of 6 to 8 in the water of the tank. 
  • Do not re-enter treated area for 4 hours.
  • Also suppresses Black scurf.  See Soilborne Diseases and Nematodes section of this table.

Double Nickel LC

(Bacillus amyloliqufaciens strain D747)

2.5 to 10 L/ha
(1.0 to 4 L/acre)
For smaller plants or low disease pressure:   
2.5 to 5 L/ha
(1.0 to 2 L/acre)
Pythium Leak Suppression and Pink Rot

4 M (phenylamide/

chloronitrile)

Ridomil Gold/Bravo

Twin Pak

(metalaxyl-M /

chlorothalonil)

1 jug per 4 ha
(1 jug per 10 acres)
 
  • Suppression.
  • Do not use more than 3 times per season
  • Use in 225 – 1600 L/ha (90-640 L/acre) of water at 275 KPa (40 psi).
  • Apply when the largest tubers are nickel-sized and repeat at 10 to 14 day intervals for up to two more treatments. Check label for details.
  • Apply a contact fungicide for late blight 5-7 days after each Ridomil application.
  • Do not tank mix with a top-killer.

Ridomil Gold MZ 68WP

(metalaxyl-M/ mancozeb)

2.5 kg/ha
(1.0 kg/acre)
4 (phenylamide)

Ridomil Gold 480 SL

(metalaxyl-M)

4 to 6 mL of product per 100 m of row
90
  • Pink rot suppression only.
  • Does not suppress pythium leak.
  • Apply 4 ml per 100 m of row directly over the seed pieces in furrow as a 15-20 cm band prior to row closure.
  • Apply in 30 L/ha (12 L/acre) of water.
  • Apply only one time per season.
  • For control of Rhizoctonia stem and stolon canker and black scurf, tankmix with Quadris F at 4 to 6 mL per 100m of row. Note: observe 90 day PHI for this use.
  • For control of Colorado potato beetle, potato leafhopper and aphids, tankmix with Actara 240SC (see label for details).
  • Do not enter treated area for 12 hours.
  • Observe a plant back interval of 30 days.

33

(phosphonates)

Phostrol

(mono- and dibasic sodium, potassium, and ammonium phosphites)

In Furrow: 
5.8 to 11.6 L/ha
(2.3 to 4.7 L/acre)
 
Apply in 30 L/ha (12 L/acre) of water.
0
  • Pink rot suppression only.
  • Does not suppress pythium leak.
  • Apply in a band at planting over the seed pieces priro to row closure.
  • May be applied as a tankmix with Ridomil Gold 480 SL.  Read and follow the use directions on the individual product labels.  Check PHI on Ridomil 480 SL label.
  • Do not re-enter treated area for 12 hours.
Foliar: 
5.8 to 11.6 L/ha
(2.3 to 4.7 L/acre)
 
Apply in 200 L/ha (80 L/acre) of water.
  • Pink rot suppression only.
  • Does not suppress pythium leak.
  • Apply as a foliar spray on a 7 to 14 day interval.
  • Do not make more than 7 applications in a season.
  • May be applied as a tankmix with Ridomil gold MZ 68WP or Ridomil Gold /Bravo Twin Pack.  Read and follow the use directions on the individual product labels.
  • For late blight control see Late Blight Control Only section of this table.

43

(acylpicolide)

Presidio

(fluopicolide)

292 mL/ha
(118 mL/acre)
 
In-furrow:  
Apply in 50 to 100 L/ha (20 to 40 L/acre) of water.
 
Soil application:  
Apply in 200 to 400L/ha (80 to 160 L/acre) of water.
30
  • Does not suppress pythium leak.
  • Tank-mix with a product that has a different mode of action listed in this table for pink rot, such as Ridomil Gold 480 SL or Phostrol. Follow most restrictive directions including rate, PHI and re-entry interval.
  • Apply in-furrow using a 15 to 20 cm band directly over the seed piece, or in the furrow where the seed piece is to be dropped, prior to covering with soil.
  • Repeat at hilling and tuber initiation, as either a banded spray directly to the soil at the base of plants, or as a broadcast spray.
  • Do not combine in-furrow/soil applications with foliar applications of Presidio.
  • Do not make more than 2 applications of Presidio per season.
  • Maximum of 880 mL/ha (356 mL/acre) per season.
  • Do not enter treated area for 12 hours.
  • Also controls late blight when applied as a foliar spray.  See Late Blight Control Only section of this table.
49

Orondis

(oxathiapiprolin)

6.4 ml/100 m row length
 
Apply in 40 L/ha (16 L/ac) of water
N/A
  • Pink rot suppression only.
  • Apply once as an in-furrow spray at planting.
  • Direct the spray into the furrow as a 15 to 20 cm band just before the seed is covered.
  • Do not follow with foliar applications of Orondis (see Late Blight Only section of this table).
  • Do not apply more than 1.40 L/ha (570 mL/acre).
  • Do not re-enter treated area for 12 hours.
  • Also controls Late Blight (see Late Blight Control Only section of this table).
Soilborne Diseases and Nematodes (Rhizoctonia Stem and Stolon Canker, Black Scurf and Silver Scurf)

7
(carboxamide)

succinyl dehydrogenase inhibitor (SDHI) class

Velum Prime

(fluopyram)

500 mL/ha 
 
or
 
4.5 mL of product per 100 m of row (based on 90 cm row spacing)
N/A
  • Suppression of root lesion nematode, root knot nematode and potato cyst nematode.
  • Apply in 50 to 150 L/ha (20 to 60 L/acre of water.
  • Apply in a 10 to 15 cm band in-furrow at planting, directing the spray to the seed and soil just before the seed is covered.
  • Use a another mode of action or group number for the first foliar fungicide application.
  • Observe a plant back interval of 14 days for alfalfa.
  • Do not re-enter treated area for 12 hours.
  • Also suppresses early blight.

7

(carboxamide) (SDHI)

Vertisan

(penthiopyrad)

15.5 to 31 mL per 100 m row
N/A
  • Suppression only of Rhizoctonia solani.
  • Does not control or suppress silver scurf.
  • Apply in furrow at planting, using 1.4 to 1.75 L water/100 row meters.
  • Do not apply more than 1.75 L/ha (710 mL/acre).
  • Do not apply more than 5 L/ ha (2 L/acre) per season.
  • Do not re-enter for 12 hours.

7

(carboxamide) (SDHI)

Sercadis

(fluxapyroxad)

Based on 36 inch row-spacing, use 30 mL per 1000 m of row (333 mL/ha or 135 mL/acre).
 
See label for other row-spacing. 
N/A
  • Apply at planting as an in-furrow spray just before the seed is covered with soil.
  • Direct spray pattern as a 10 to 20 cm (4 to 8 inch) band to uniformly cover seed pieces and surrounding soil.
  • Do not apply more than 1.0 L/ha (405 mL/acre) per season
  • No more than 2 consecutive applications before alternating with a fungicide with a different mode of action.
  • Do not enter treated area for 12 hours.
  • For crops not listed, observe a plantback interval of 1 year.
  • Also controls Ealry Blight when applied as a foliar spray.  See Early Blight Control Only section of this table. 

7

(carboxamide) (SDHI)

Aprovia

(benzovindiflupyr)

500 to 750 mL/ha
(200 to 300 mL/acre) 
 
or
 
4.5 to 6.8 mL per 100 m of row (based on 90 cm row spacing)
 
Apply in 50 to 150 L/ha (20 to 60 L/acre) of water
N/A
  • Suppression only.
  • When used at the high rate, also suppresses verticillium wilt.
  • Apply as an in-furrow spray, directing the spray into the furrow as a 15 to 20 cm band just before the seed is covered.
  • Do not aply more than 750 mL/ha (300 mL/acre) per application.
  • Do not apply more than 100 g a.i./ha (40 g a.i./acre) of benzovindiflupyr-containing products on potato crops per season if an in-furrow application is made.
  • Observe a plantback interval of 6 months for crops not listed.
  • Do not re-enter treated area for 12 hours.
11
(strobilurin)

Quadris F

(axosystrobin)

4 to 6 mL of product per 100m of row
90
  • Apply in 50 to 140 L/ha (20 to 55 L/acre of water.
  • Apply once as an in-furrow spray as a 15 to 20 cm band just before the seed is covered.
  • Observe a plant back interval of 30 days for potatoes (root crops).

11 & 7

(amide/strobilurin)

Elatus

(benzovindiflupyr/

azoxystrobin)

See rate conversion chart of label for rates per 100 m row.
 
Apply in 50 to 150 L/ha (20 to 60 L/acre) of water.
N/A
  • Make an in-furrow application at planting.
  • Do not apply more than 1.5 kg/ha (0.6 kg/acre) per season.
  • Observe a plantback interval of 6 months for crops not listed.
  • Also controls ealry blight and black dot when used as a foliar spray.  See Early Blight control Only section of this table for details.
 

Serenade Soil

(QST 713 strain of
dried Bacillus subtilis)
 
Used in organics.

 

2.7 to 14 L/ha
(1.1 to 5.7 L/acre)
0
  • Suppression only.
  • Also suppresses pink rot.
  • Serenade Soil (PCP# 30666) is OMRI-Canada listed.  Check with your certification body before using in an organic operation.

In-Furrow Application:

  • Apply in a narrow band with the spray directed at the seed and surrounding soil  before covering the seed or seed piece.

Post-plant applications:

  • After crop germination, additional applications may be made to the soil as a drench or spray directed towards the base of the plant.
  • Irrigate to move material into the seed or root zone within 24 hours.
  • Repeat at 21 to 28 day intervals.
44

Double Nickel 55

(Bacillus amyloliqufaciens strain D747)

Soil application:  
0.2 to 1 kg/ha
(80 to 400 g/acre)
N/A
  • Suppression of Black scurf (Rhizoctonia solani) only.
  • Apply as a 10 to 15 cm (4 to 6 inch) wide banded spray directly over the seeds in-furrow just before they are covered with soil.
  • See banded/in-furrow rate conversion chart of label for the amount of product per 100 meters of row that will provide the desired application rate based on row spacing. 
  • Do not use highly alkaline or highly acidic water to mix sprays.
  • If necessary, use a buffering agent to maintain a pH of 6 to 8 in the water of the tank. 
  • Do not re-enter treated area for 4 hours.
  • Also suppresses Early Blight.  See Early Blight Control Only section of this table.

Double Nickel LC

(Bacillus amyloliqufaciens strain D747)

Soil application:
1 to 5 L/ha
(0.4 to 2 L/acre)
*PHI = Pre-harvest interval
BUFFERS – Refer to product label for buffer requirements. See also Pesticide Regulations and Safety section of this guide.
PESTICIDE GROUP DETAILS – see Pesticide Toxicity Table of this guide.
OMRI- Canada = Organic Materials Review Institute of Canada

 

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