Vegetable Production Guide

Lettuce
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Table 1 Lettuce Weed Control

This section was updated - 16 June 2021

Table 1 Lettuce Weed Control

 

Product

Rate

PHI*

Comments

Kerb 50 WSP


(propyzamide)

Group 15
2.2 kg/ha
(900 g/acre)

Apply in 300 to 500 L/ha (120 to 200 L/acre) of water
Direct seeded:
55
  • Direct seeded – apply pre-plant incorporated, pre-emergence or post-emergence.
  • Transplanted – apply 7 to 10 days after transplanting.
  • Do not make more than 1 application per year.
  • Is not effective on high organic matter soils.
  • Do not replant lettuce in treated fields in the same year. See label for more plant back restrictions.
  • Does not control dandelion or Canadian thistle.

Post-emergence

Aim EC

(carfentrazone-ethyl)

Group 14

37 to 117 mL/ha
(15 to 47 mL/acre)

Apply in 100 L/ha (40 L/acre) of water

 

1
  • Controls annual weeds.
  • Must be applied using hooded sprayers to actively growing weeds between the rows of the emerged crop.
  •  Use an adjuvant such as Agral 90 or Agral-Surf at 0.25% v/v (0.25 L/100 L of spray solution) or Merge at 1% v/v (1 L/100 L of spray solution).
  • PRECAUTION:  crop injury will occur when spray drift is allowed to come in contact with green stem tissue or leaves.
  • Apply only once per growing season.

Poast Ultra plus Merge at the following rates:

 

Poast Ultra

Merge

Annual grasses (incl volunteer cereals) 320 mL/ha
(130 mL/ac)
0.5 - 1.0 L/ha
(0.2-0.4 L/ac)
Annual grasses & quackgrass suppression 470 mL/ha
(190 mL/ac)
0.5 - 1.0 L/ha
(0.2-0.4L/ac)
Quackgrass 1.1 L/ha
(445 mL/ac)
1.0–2.0 L/ha
(0.4-0.8 L/ac)
30
  • For transplanted lettuce, apply 1 time per year.
  • For direct-seeded lettuce, 2 applications per year can be made to a total maximum application rate of 1.1 L/ha (445 mL/ac).
  • Apply when annual weeds are in the 1 to 6 leaf stage and quackgrass is in the 1 to 3 leaf stage.
  • For direct-seeded lettuce, make 2nd application 14 to 21 days after thinning.
  • Annual bluegrass is not controlled.
  • Apply in 50 - 200 L/ha (20 - 80 L/ac) water.
  • Pressure varies with various water volumes, see label for detail.
  • Observe a plant back interval of 30 days for all crops not listed on label.
  • Group 1 herbicide.

Stale Seedbed

Ignite 15 SN


(glufosinate ammonium)

Group 10
2.7 to 5.0 L/ha
(1.1 to 2.0 L/acre)

Apply in 110 to 330 L/ha (45 to 135 L/acre) of water at 275 to 310 kPa
N/A
  • May be used for annual grasses and broad leaf weeds.
  • Do not handle with bare hands or with leather or cloth gloves.
  • Rainfall within 4 hours may reduce effectiveness.
  • See section on stale seed bed technique (Pest Management section of this guide).
*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.

 

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