Bacillus thuringiensis (Bt) is a natural microbial insecticide that can control many kinds of insects. Read now on Gardener’s Path for tips on using Bt.
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@InTheShed heres some reading on Different BT uses
How Does Bt Kill Insects?
Bt will only kill insects that eat the toxin and are susceptible to it. This is not a toxin that will kill on contact like most insecticides.
Once eaten, the toxin affects a specific switch in the stomach – like a lock and a key. This switch (a receptor) activates a reaction that makes holes in the stomach.
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.
It can take the insect hours or days to die. 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. They are probably on their deathbeds.
The insects are usually the most susceptible when the larvae are small.
How to Kill Caterpillars With Bt
Bacillus thuringiensis kurstaki (Btk) is the best known and most widely used strain of Bt. It kills the larvae of many types of moths and butterflies.
You might already have this knowledge on BT but I thought it was interesting and I wanted to share
Brother