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drift of the spray.

Just the right size of volume and the droplet will stick to the leaf. Otherwise, the droplets could dribble off. You need fine droplets to stick; and not too much or it will run off. More is not better, he added. When you halve the diameter of the

droplet, you have eight times the number of droplets. Larger droplets will bounce off the insect and be ineffective. There’s a much better chance the smaller droplets will impact the insect in a contact spray, but there is a tendency for drift when you use the smallest size.

Another issue is that nozzles do get plugged and if you ream them out you increase the size of the nozzle and the the droplet that comes out of it. He advised that modern nozzles are coded by colour which makes it easy to see which one you have.

As well, Landers warned that excess air transports droplets through and past the canopy, past the target. As well, excessive shaking of the canopy results in removing droplets already present on the target. This can happen when you hit the canopy from

the other side.

He suggests using a tower because it is ideal for penetration of the canopy. It moves horizontally, reaching the tree at different levels and improving deposition of the


“Adjust the airflow to match the canopy size, so the spray hovers like a fog in the canopy,” he explained. For more information, go to:


British Columbia FRUIT GROWER • Summer 2016

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