Vegetable Production Guide

Parsnips
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Table 1 Parsnip Weed Control

This section was updated - 08 May 2021

Table 1 Parsnip Weed Control

 

Product

Rate

PHI*

Comments

Pre-emergence

Linuron 400L


(linuron)

Group 7		 Loam or clay soil with low organic matter:
1.5 to 2.0 L/ha
(600 to 800 mL/acre)

Muck or clay Soils with med. organic matter:
2.0 to 2.75 L/ha
(0.8 to 1.1 L/acre)		 N/A
  • Plant seeds at least 1.5 cm deep.
  • Apply after planting.
  • Apply once per season.
  • Rain or irrigation is needed for good control.
  • Do not apply on coarse textured soils with less than 2% organic matter.
  • Do not replant to other crops within 4 months of last application.
  • May cause damage to turnips grown the following year.

Lorox L


(linuron)

Group 7		 Loam or clay soil with low organic matter:
1.3 to 1.9 L/ha
(520 to 760 mL/acre)

Muck or clay Soils with med. organic matter:
1.9 to 2.5 L/ha
(0.76 to 1.0 L/acre)		 60
  • Plant seeds at least 1.3 cm deep.
  • Do not apply more than 1.9 L/ha if following with a post-emergence application of Lorox L. Check label for pre-emergence plus post-emergence directions.
  • Do not use on sandy or coarse-textured soils low in organic matter.
  • Rain or irrigation is needed for good control.

Post-emergence

Guardsman/ Agricultural Weedkiller No. 1


(mineral spirits)		 Whole field treatment:
600 to 800 L/ha
(243 to 324 L/acre)

Row treatment:
300 to 400 L/ha
(121 to 162 L/acre)		 30
  • Controls annual grasses, redroot pigweed, lamb’s quarter, purslane, and cottontop.
  • Crop damage may result if sprays are applied in hot, dry weather or when plants are wet with rain or dew.
  • Apply when plants are in 2 to 4 leaf stage and before weeds are 10 cm high.

Lorox L


(linuron)

Group 7		 1.9 to 4.7 L/ha
(0.7 to 1.9 L/acre)

Apply in 220 to 440 L/ha (90 to 175 L/acre) of water at 275 kPa 		60
  • Rate is for parsnips not treated pre-emergence.
  • Apply when crop has 2 or more fully developed leaves.
  • On muck soils, plants must be more than 8 cm tall when spraying.
  • Apply before annual grasses are 5 cm tall and before broadleaved weeds reach 15 cm.
  • Will not control atrazine resistant weeds.
  • Do not tank mix with herbicide oil or surfactants.
  • Do not use on sandy soils with less than 2% organic matter.
  • Do not replant to other crops within 4 months of last application.
*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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