What are these worms on my pine tree? - Knowledgebase Question

Minneapolis, MN (Zone 4)
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Question by galerg1185
May 11, 2007
I have a new White Pine tree in my yard, I went to look at it today and it was

Answer from NGA
May 11, 2007
There are two caterpillars that feed on pine needles; both are specific to pines so you don't need to worry about them feeding on other plants in your garden. The Pine Butterfly larvae are dark green with two stripes down each side. The Pandora Moth larvae are large, heavy-bodied, and have spines on them. Both caterpillars are susceptible to Bt (Bacillus thuringiensis), a bacterium that acts as a stomach poison. These two insects are present in small numbers most of the time but when the populations surge, you'll notice the feeding damage. Monitor what happens over the next few days to a week. Generally no control is necessary; the population of natural predators (birds love succulent caterpillars) will increase and take care of the problem.

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