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Bt Kurstaki is for caterpillers... Bt Israliensis is for skeeters... :)

BtK is an insecticide that killls caterpillers only. it gives them somethin akin to a stomach flu. They eat a bit of leaves with BtK on them, get ill, stop eating and die a few days later. There is also BtI for mosquitos ;)

BtK works well for most caterpillers in their feeding stage. :)