Weed Management Updates for Berry Crops

By Mackenzie Lespérance, Weed Management Program Lead - Horticulture, OMAFRA

Ontario raspberry growers have some new weed control options for the 2016 growing season. In addition to the list of herbicides in Publication #75 Guide to Weed Control 2016-2017 "Berry Crops" section, there are two more herbicide options registered on raspberries:

  1. Post emergent grass and broadleaf herbicide: Prism SG
  2. Post emergent broadleaf herbicide: Aim EC

Myth Busting Time: herbicides labelled for raspberries are also legal to use on blackberries?

Wrong - blackberries are not always on the same herbicide label as raspberries. Please be careful when choosing herbicide options for use on blackberries. Products registered for the caneberry crop group can be used on both raspberries and blackberries.

In order to reduce the confusion, a new "Blackberry" section has been proposed for the next edition of Pub 75. Please see the blackberry section below for labelled herbicides available to you this season!

Also - for those of you who are growing specialty berry crops such as edible honeysuckle/haskap - Poast Ultra is available for post emergent grass control. See below for details.

Raspberry - newly registered products

Trade Name (concentration)
Product Rate
Precautions

Prism (25 DF)

+ Agral 90 or Ag-Surf or Citowett Plus (2L/1,000L)

60 grams/ha
  • Established plantings only
  • Make an early postemergent application to actively growing weeds
  • Use a directed spray application while minimizing the amount contacting the raspberry plants
  • only use ground equipment
  • Use a minimum of 100 L of water/ha
  • Recommended spray volume is 140-190 L/ha
  • Do not apply more than 60 grams/ha per year if broadcast spraying
  • If applied as a banded treatment (50% band or less) Prism can be applied twice per year
  • Pre-harvest interval is 21 days

Aim EC (240 g/L)

+ Agral 90 or Ag-Surf (0.25L/100L) or Merge (1L/100L)

37-117 mL in 100 L/ha spray solution
  • Hooded sprayer application only
  • Between the rows, apply to actively growing weeds less than 10cm tall
  • Do not allow spray contact with raspberry leaves or canes or injury will occur
  • Applications should not be made within 6-8 hours of rain or irrigation or when heavy dew is present on the crop
  • only one application per year
  • Pre-harvest interval is 15 days

Blackberry - registered products

Trade Name (concentration)
Product Rate
Precautions
Devrinol DF XT (50 DF-XT) or Devrinol DF (50 DF) 9 kg/ha
  • New and established plantings however, established plantings is recommended
  • Do not apply to frozen ground
  • Apply in the fall through early spring prior to weed emergence
  • If rainfall does not occur 24-72 hours after application, shallow incorporation (2.5-5cm) or irrigation (5-10cm) is necessary
  • Use as a directed spray and avoid contact with fruit and foliage
  • Do not apply at harvest
  • Do not graze treated areas
Princep Nine-T (90 WG) 2.5-3.75 kg/ha in 300L of water
  • Established planting only
  • Apply to base of canes in early spring
  • Do not apply by air
  • Do not spray young shoots
  • Apply only once per year
Poast Ultra (450 g/L)

+ Merge or Assist (0.5-2.0 L/ha)

0.32-1.1 L/ha
  • Do not apply by air
  • Prior to full application, apply to a small area to confirm crop tolerance
  • Consult your plant supplier for more information on varietal tolerance pertaining to blackberries
  • Do not apply during periods of dead calm
  • Apply as a directed spray application to the base of the blackberries
  • only use ground equipment
  • Pre-harvest interval is 37 days
  • For annual grass use 0.32 L/ha. Apply at the 1-6 stage ( 2-5 is optimum)
  • For volunteer grains use 0.47 L/ha. Apply at the 1-6 stage ( 2-5 is optimum)
  • For quackgrass, use 1.1 L/ha. Apply up to the 3 leaf stage.
Prism (25 DF)

+ Agral 90 or Ag-Surf or Citowett Plus (2L/1,000L)

60 grams/ha
  • Established plantings only
  • Make an early postemergent application to actively growing weeds
  • Use a directed spray application while minimizing the amount contacting the blackberry plants
  • only use ground equipment
  • Use a minimum of 100 L of water/ha
  • Recommended spray volume is 140-190 L/ha
  • Do not apply more than 60 grams/ha per year if broadcast spraying
  • If applied as a banded treatment (50% band or less) Prism can be applied twice per year
  • Pre-harvest interval is 21 days
Aim EC (240 g/L)

+ Agral 90 or Ag-Surf (0.25L/100L) or Merge (1L/100L)

37-117 mL/ha in 100 L spray solution
  • Hooded sprayer application only
  • Between the rows, apply to actively growing weeds less than 10cm tall
  • Do not allow spray contact with blackberry leaves or canes or injury will occur
  • Applications should not be made within 6-8 hours of rain or irrigation or when heavy dew is present on the crop
  • only one application per year
  • Pre-harvest interval is 15 days

Edible Honeysuckle (Haskap) - registered products

Trade Name (concentration)
Product Rate
Precautions
Poast Ultra (450 g/L)

+ Merge or Assist (0.5-2.0 L/ha)

0.32 L/ha or 0.47L/ha or 1.1 L/ha
  • Do not apply by air
  • Prior to full application, apply to a small area to confirm crop tolerance
  • Consult your plant supplier for more information on varietal tolerance pertaining to edible honeysuckle
  • Do not apply during periods of dead calm
  • Pre-harvest interval is 15 days
  • For annual grass use 0.32 L/ha. Apply at the 1-6 stage ( 2-5 is optimum)
  • For volunteer grains use 0.47 L/ha. Apply at the 1-6 stage ( 2-5 is optimum)
  • For quackgrass, use 1.1 L/ha. Apply up to the 3 leaf stage.

For more information:
Toll Free: 1-877-424-1300
E-mail: ag.info.omafra@ontario.ca