Many Blue Spruce, are showing infestations of bagworm. Bagworms tend to blend in with other parts of the tree. At first, it may look like a spruce or fir cone. 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. Other evergreen showing symptoms of bagworms were Arborvitae,
Now is a great time to get out and scout for bagworm. As mentioned, if only a couple of bags are observed, just remove them and burn them, unless the tree is too tall. The best way to remove the bags is to cut them off with pruning shears. Pulling the bags off by hand can damage the cambium tissue on the stem since the silk from the bagworm is very strong.
Fairly 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. Insecticides applied in mid- to late June are the most effective.
Colorado blue spruce in Ohio seem to be encountering more issues in the landscape. Bagworms can be found on Arborvitaes, deciduous and evergreens, although damage on evergreens can be more lethal since they defoliate the tree and they will not grow needles until the next year. Several years of defoliation can kill the tree.
Please contact any Weybridge Board member and report any sightings so we can let Brightview Landscaping know so action can be taken.