Bacillus thuringiensis, subsp. kurstaki, strain ABTS-351. One bite and they lose their appetite. B.t. kills leaf-eating caterpillars of lepidopteran moths. Slow acting but effective, they die in two days.The B.t. bacteria paralyzes their digestive system and are harmless to beneficial insects, animals and humans.
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Our corner of the county got hit hard by gypsy moths this year. The heat was keeping me from using the oil that I had, but the Bt did the job beautifully while leaving other critters alone. Sprayed for my neighbors too, and they were very happy with the results. Top of my annual stock list now!
Mixed up one heavy batch of BT in my backpack sprayer, and sprayed my apple and cherry trees. Within two to three days my leaf roller infestation was no more. Great stuff!!!