Most of the larvae are unsuccessful and simply land on the plant on which their bag was attached. Each larva spins down on a strand of silk and attempts to balloon. These eggs remain in the body of the mummified female and seem to be surrounded by some insulation-like material.įairly late in the spring, late May into early June, the eggs hatch and the tiny larvae emerge through a hole in the bottom of the bag. (Bagworm on the right, Douglas Fir cone on Left below)īagworms overwinter as eggs. The bags are surprisingly difficult to see when they are covered with fresh, green plant material. When this turns brown, homeowners often think that they are seeing cones of some sort. On conifers, especially junipers, arborvitae and spruces, the larvae can defoliate branches and even entire trees. However, on close inspection, multiple bags may begin to appear, holding many eggs that will hatch in the spring and infest the tree the following spring. It can also look like Cooley Spruce Gall Adelgid. Bagworms tend to blend in with other parts of the tree.Īt first, it may look like a spruce or fir cone. Many Blue Spruce, Picea pungens ‘Glauca’,are showing infestations of bagworm. Ever drive by a tree and say to yourself, something doesn’t look right.
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