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Night spraying: Pesticide efficacy with night time applications

Lead Researcher Ken Coles
Co-Researcher(s) Alyssa Krone, Vance Yaremko
Start Date April 2012
End Date March 2015
Funding Partners WGRF
Status Complete

The Challenge

Growers are farming more acres with a seemingly smaller window of application due to environmental factors. With an increased reliance on pesticides under zero-till systems, recommended pesticide applications can sometimes be stretched.

The Project

Evaluate the efficacy of pre-seed burndown and in-crop herbicide applications on LL canola, RR canola, wheat and peas at three different spray times; day 12-2 pm, night 12 pm-1 am, & early morning 4-5 am. Determine whether night and/or early morning herbicide applications are viable as an alternate spraying time compared to the day, while uncovering challenges and successes of each.

The Results

Day application of herbicides yielded the best results, with early morning application being the least effective. A substantial advantage of day and night applications over early morning application.

Grower Benefits

Although not optimal, night applications (12 pm-1 am) can serve as an alternative time to apply herbicides when day (12-2pm) applications are limited. Avoid spraying fungicides in the early morning (4-5am).


Keywords: Night time spraying, Herbicide application, Weed control

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