Three manageable factors that affect spray drift

It’s not only field sprayers that drift. Photo Credit – G. Amos and D. Zamora, Washington State.

In 2014 one of our OMAFRA summer students designed a short-and-gritty demonstration using a backpack sprayer, a variable-speed fan and some water-sensitive paper positioned downwind at 1.5 metre intervals. The intent was to illustrate how sprayer operators could reduce the potential for off-target drift by recognizing and accounting for three factors: Apparent wind speed (i.e. […]

Read More… from Three manageable factors that affect spray drift

Ten Tips for Spraying in the Wind

Choosing the right time to spray can be tricky. Our gut tells us that spraying when it’s windy is wrong.  The experts tell us that spraying when it’s calm is wrong. So when can you actually spray? I’ve always advised my clients to spray in some wind, because it has a few advantages. The main […]

Read More… from Ten Tips for Spraying in the Wind

Mode of Action and Spray Quality

The decision on application method for herbicides boils down to two main factors: (a) target type and (b) mode of action. In general, It’s easier for sprays to stick to broadleaf plants on account of their comparatively larger leaf size and better wettability compared to grassy plants. There are exceptions, of course – at the […]

Read More… from Mode of Action and Spray Quality

Fundamentals of Spray Drift

The year 1989 marked my first spray drift trial under the watchful eye of Dr. Raj Grover and John Maybank. We evaluated the performance of several spray shrouds, Flexi-Coil, AgShield, Brandt, and Rogers, and wanted to measure just how effective they were. But in my heart I wasn’t interested in drift. I wanted to study […]

Read More… from Fundamentals of Spray Drift

What’s the Relationship Between Vapour Drift and Inversions?

Drift symptoms can take a few weeks to be discovered, and to figure out the cause, people need to reconstruct the conditions during the application in question. Wind direction is the easiest. But when we consider factors like inversions, volatility, calm conditions, and others used to explain the movement of pesticides, it can quickly become […]

Read More… from What’s the Relationship Between Vapour Drift and Inversions?