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Message: [QUOTE="Chuck, post: 63285, member: 944"] Spinosad is great stuff, an excellent all around organic pesticide. Bt is much more effective on caterpillars however. With Bt, after one bite of a sprayed leaf the caterpillar immediately stops feeding and is dead within 4-6 hours. Since caterpillars chew completely through a leaf spraying both sides is not mandatory. Bt is selective as it only kills caterpillars. Spinosad is non selective and therefore one must be careful as to what all is going to be affected. Every serious gardener should have both and Neem Oil too [/QUOTE]