Be Sure to Follow Pre-harvest Intervals of Insecticides

While much of Manitoba’s canola crop is already in the swath or being combined, Alberta and Saskatchewan fields are at or approaching proper swath timing. Unfortunately, late season pests like bertha armyworm are also building substantially in many areas. Why is this an issue? Because of the pre-harvest interval (PHI) required for many insecticide products.

The PHI is days between application and the crop being CUT, not harvested. For some actives, like Lambda-cyhalothrin (Matador/Silencer) or Deltamethrin (Decis 5EC), the PHI is seven days but with chlorpyrifos (Lorsban/Citadel/Pyrinex/Nufos) the PHI is 21 days. For some products, it’s as much as 30 days. The decision to spray and the decision on swath timing have to jive; which is the greatest risk? Spraying but extending the stand time or not spraying but cutting at optimal timing? Either way, if you’ve already sprayed, you must wait the required days before cutting — even if the swath will sit for two to three weeks. Why? The Canola Council of Canada spells out the risks on its website: tests for detecting residues are very sophisticated. One part per billion is equivalent to about nine seeds of canola in a ‘Super B’ grain trailer, says the Canola Council; finding the residue either here or overseas could result in serious fines.

 

RealAgriculture Agronomy Team

A team effort of RealAgriculture videographers and editorial staff to make sure that you have the latest in agronomy information for your farm.

Trending

Yes, you can build your own autonomous tractor

Many situations have two scenarios: one where a problem is looking for a technology, or the other where technology exists and is looking for a problem to solve. In the case of farming, often it's the problem that comes first, but when it comes to autonomy, the technology has been leaps and bounds ahead of…Read more »

Related

Leave a Reply

 

This site uses Akismet to reduce spam. Learn how your comment data is processed.