Bt Insecticides for Home Gardeners and Small Scale Growers Less concentrated, home-scale version of Dipel DF, but in convenient liquid spray concentrate. 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. Use 1-2 tsp concentrate per gallon water.
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