![]() Several Btk formulations are available from Arbico Organics.Īnother strain of Bt, Bacillus thuringiensis aizawai (Bta) kills the larvae of wax moths in honeycombs. There are even formulations designed to control Indian meal moth larvae in stored grain. Other caterpillars commonly controlled by Btk include the European corn borer, tent caterpillars, gypsy moths, and other forest caterpillars. This includes many types of caterpillars more commonly known as “worms” that feed on broccoli, cabbage, and other crucifers. This means that you can control most caterpillars with Btk. It kills the larvae of many types of moths and butterflies. How to Kill Caterpillars With Btīacillus thuringiensis kurstaki (Btk) is the best known and most widely used strain of Bt. ![]() The insects are usually the most susceptible when the larvae are small. Typically, the insect remains on the plant as it is dying, so don’t be alarmed if there are still insects on your plants even after treatment. It can take the insect hours or days to die. The contents, including the toxin and normal gut bacteria, spill out into the rest of the insect’s body, and it dies of infection and starvation. This switch (a receptor) activates a reaction that makes holes in the stomach. Once eaten, the toxin affects a specific switch in the stomach – like a lock and a key. This is not a toxin that will kill on contact like most insecticides. Bt will only kill insects that eat the toxin and are susceptible to it.
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