PMRA consultation on Thiamethoxam (Actara 25WG) and Clothianidin (Clutch 50WDG)

Wednesday, January 3, 2018

On December 19, 2017 PMRA announced a re-evaluation of and opened consultations on the neonicotinoid pesticides - Thiamethoxam (Actara 25WG) and Clothianidin (Clutch 50WDG) citing concerns about the effects of neonicotinoid pesticides on bees and other pollinators.

These consultations are open for comment from 19 December 2017 to 19 March 2018 (90 calendar days).  Comments can be provided to PMRA at: http://www.hc-sc.gc.ca/contact/cps-spc/pmra-arla/pmrapub-eng.php

In summary, the following mitigation measures are being proposed respecting Thiamethoxam (Actara 25WG) use in berries on weevils:

Strawberry
          Remove pre-bloom foliar use
          Maintain post-bloom foliar use with renovation after harvest 
          Remove soil use
Bushberry (incl. highbush blueberry) and Caneberry (incl. raspberry and blackberry)
          Remove pre-bloom and during bloom foliar use
          Maintain post-bloom application

In summary, the following mitigation measures are being proposed respecting Clothianidin (Clutch 50WDG) use in strawberries on tarnished plant bug (Lygus bug):
           Remove pre-bloom application timing based on potential for risk
           Restrict timing to post-bloom application

Other crops will also be effected by this re-evaluation.  Complete information on the re-evaluation consultation is available at: https://www.canada.ca/en/health-canada/services/consumer-product-safety/pesticides-pest-management/public/consultations/neonicotinoid-pesticides.html

Fall strawberry management

Friday, November 17, 2017

Well, after a long drawn out fall it looks like the weather is finally changing and most growers are itching to put their strawberries to bed for the winter. 
Before throwing on that mulch consider doing a late fall, dormant weed spray.  For information on products available check out Perennia’s Guide to Weed Management in Strawberry or New Brunswick’s StrawberryIPM Weed Management Guide.
A frequent question from growers this time of year is when to apply mulch to strawberries.  In short – let your plants tell you when it’s time.  It can be very site specific.  After several hard frosts, leaves begin to turn red (it's not time yet!); then the leaves collapse around the crown or fall over and will eventually flatten completely to the ground.  Now it’s time!  Typically dormancy in strawberries will occur after several consecutive days of frost.   

Plants mulched too early in the fall do not harden off well, while unmulched plants can result in crown damage.  Mulch not only insulates from severe cold, but it lessens frost heaving of crowns through freeze and thaw cycles, and desiccation from dry winter winds.
Be sure to obtain clean straw for mulching and AVOID HAY, as it is littered with weed seeds. The last thing you need is to create a weed problem in your own field from using dirty straw. 
In Nova Scotia common mulches include wheat, barley, or oat straw.  To apply mulch, break up the bale completely, spreading loose straw on the strawberry raw a few inches deep.  Also, by covering any exposed soil between rows can help prevent erosion. 
For more info on mulching strawberries, check out this great video on strawberry mulching is available from University of Maine Berry expert David Hadley: https://youtu.be/cjK1kZ1FmrE