Update: Taking steps to control winter moths

A few weeks ago I blogged about how to prevent winter moths from damaging — or destroying — your flowering trees, fruit trees and blueberries. And while that advice fit the strategy for a typical spring, we’ve not had a typical spring. So here’s an update on what to do, given the unusual weather conditions we’ve had.

What’s been unusual? It’s been far colder than normal, and we’ve had a lot of precipitation. This has made it hard to employ the first major step in an anti-winter-moth campaign: applying insecticidal soap or dormant spray oil. Both of these compounds need to be applied when its cold but the weather is also dry for a period of days, and that combo hasn’t happened.

So now it’s too late to apply them. We’re approaching mid April and buds are starting to swell. Both of those sprays will damage your fledgling buds.

Time to move to phase 2 — applying Bacillus thuringiensis, or bt for short. It’s an organic compound that can be sprayed directly onto your bushes and trees. It won’t hurt the buds at all; instead it will help to kill any winter moth larva that try to eat your buds.

This is a perfect time to apply it. The next few days will be unseasonably warm and dry, which will cause buds to accelerate their growth. It will also be a wake-up call for winter moth eggs to hatch. Best to get them while they are young. For details on what to buy and how to spray, check out my previous blog on the matter.

You may be able to get a couple of sprayings in before the rains return near the end of next week. That  will put a nice dent in the winter moth infestation. After that, try to spray every 3-4 days. It will be worth it!

John Macone operates Farmer John’s Organic Foods, a neighborhood farm stand in Amesbury. To keep on top of what the farm is offering, like the Facebook page https://www.facebook.com/Farmerjohnsfoods

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