Bt Insecticides for Home Gardeners and Small Scale Growers Less concentrated, home-scale version of Dipel DF, but in convenient ready-to-use dusting powder. Contains Bacillus thuringiensus v. kurstaki, a naturally occurring bacterial insecticide. Use in late afternoon or on cloudy days as Bt breaks down in sunlight. After ingesting the treated portion of the leaf, caterpillars stop feeding within a few hours and death occurs in a few days. Can be used the same day as harvest, and does not harm beneficial insects. Effective against a wide variety of worms and caterpillar larvae including tent caterpillars, inch worms, gypsy moth larvae, tomato hornworm, cabbageworm, corn earworm, oakworm, webworm, and many more. Dust adheres best when plants are moist.
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