The Q&A Archives: Tent Worms

Question: I have tried ortho's systemic and the tent worms keep coming back to 2 blue spruce trees. I have been picking them off by hand which helps but what is the cure?

Answer: You can control tent worms with sprays of Bt (Bacillus thuringiensis). Bt is a bacterium which acts as a stomach poison and is fatal to caterpillars. Best wishes with your spruce trees.

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