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Bacillus Thuringiensis

A few days ago you talked about control of bagworms. What was the spray that we should use to control them? Thanks.

The spray I mentioned for killing bagworms is BT, Bacillus thuringiensis. This is actually a concentration of bacteria and you can find it in most garden centers.

The active ingredient in BT is actually a toxin produced by the bacteria that kills caterpillars. But it won’t harm other beneficials to the garden such as bees and earthworms. It’s best to spray as soon use you see or suspect any damage and it may require several applications before you get them under control.

That main thing to remember about this pest is that it is the caterpillar that does all of the damage in the spring. One of the best ways I have found to deal with these little devils is to hit them when they are most vulnerable, as caterpillars.

Anytime you are dealing with these tent caterpillars it’s important to tear into the webbing and spray inside. The worms ingest the bacteria, which makes them sick and they eventually die.