Vegetable Production Guide

Parsnips
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Table 1 Parsnip Weed Control

This section was updated - 06 July 2018

Table 1 Parsnip Weed Control

 

Product

Rate

PHI*

Comments

Pre-emergence

Linuron 400L

(linuron)

Group 7
 
Note:  no longer available. Registration expires December 2019
Loam or clay soils 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 soils 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.

Dual II Magnum

(S - metolachlor)

Group 15
Mineral soils:
1.2 to 1.5 L/ ha
(500 mL to 600 mL/ acre)
 
Muck soils (>20% OM):
1.5 to 1.75 L/ ha
(600 to 708 mL/ acre)
 
Apply in 150 to 300 L/ha (60 to 120 L/acre) of water at 200 to 300 kPa
60
  • Apply after planting prior to emergence of crop and weeds.
  • For mineral soils, controls nightshade, foxtail and barnyard grass and suppresses redroot pigweed.
  • For muck soils, suppression only of listed weeds.
  • On muck soils, irrigate immediately after appplying with 0.5 inches of water.
  • Use in soils with high organic matter may result in reduced efficacy.
  • Make only one application per year.
  • Do not follow with a post-emergent spray of Dual II Magnum later in the season (see Post-emergence section of this table).
  • Pre-emerge treatment sometimes gives better control of nightshade than post-emerge treatment.
  • Do not apply in areas where water is likely to pool.
  • May cause significant injury to carrots resuting in stand loss, delayed maturity and reduced yields.
  • Rain is required within 10 days of application, or a shallow cultivation.
  • Do not apply to soils with less than 1% organic matter.
  • Do not re-enter for 12 hours.

Post-emergence

Select

(clethodim)
 
Group 1

0.19 to 0.38 L/ha                   (75 to 155 mL/acre)

Apply in 110 L/ha (45 L/acre) of water at 275 kPa

30
  • Apply post-emergence of weeds and crop.
  • Controls annual grasses and suppresses quackgrass at the 2 to 6 leaf stage.
  • Use only with the adjuvant Amigo at 0.5 to 1.0% v/v.
  • Apply early, prior to tillering.
  • Repeat using a 14 day interval.
  • Maximum of 2 applications per year.
  • Do not apply more than 0.38 L/ha (155 mL/acre) per crop season.
  • Allow 4 days after treatment before applying any other chemical not listed on the label.
  • Do not enter treated area for 12 hours.

Centurion

(clethodim)
 
Group 1

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
  • Apply when plants are in 2 to 4 leaf stage and before weeds are 10 cm high.
  • Controls annual grasses, redroot pigweed, lamb’s quarter and purslane.
  • Pineappleweed and wormseed mustard are not controlled consistently.
  • Crop damage may result if sprays are applied in hot, dry weather or when plants are wet with rain or dew.
  • Note: Other solvents may cause crop damage.

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.

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 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.

Dual II Magnum

(S - metolachlor)

Group 15
Mineral soils:
1.2 to 1.5 L/ ha
(500 mL to 600 mL/ acre)
 
Apply in 150 to 300 L/ha (60 to 120 L/acre) of water at 200 to 300 kPa
60
  • Apply when the crop is at the 3 to 5 leaf stage and to weeds prior to the 2-leaf stage.
  • Controls nightshade, foxtail and barnyard grass.
  • Make only one application per year.
  • Do not follow with a post-emergent spray of Dual II Magnum later in the season (see Post-emergence section of this table).
  • Pre-emergent treatments sometimes gives better control of nightshade than post-emergent treatments.
  • Do not apply in areas where water is likely to pool.
  • May cause significant injury to carrots resuting in stand loss, delayed maturity and reduced yields.
  • Rain is required within 10 days of application, or a shallow cultivation.
  • Do not apply to soils with less than 1% or more than 10% organic matter.
  • Do not re-enter for 12 hours.
*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.

 

Viewing Section 8 of 10