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they can be difficult to control with anything. By mid-August, they quit feeding and pupate in the bags. Male moths are strong fliers and emerge in early fall. They mate with the female moths, which lay eggs in their bags, then crawl out and die. Bags can be hand picked from fall through spring to reduce overwintering eggs.
Another common insect this year is the fall web worm. The web worm constructs a loose, ugly nest over the ends of branches of many deciduous trees and shrubs. The young larvae feed on foliage within the webbing, and the nest increases in size as the larvae grow. The first generation is active in June, a second generation will be out in August.
The webbing is more unsightly than damaging, and can be cut out of affected plants. Sprays are also an option. Again, Bt works when the nests are small and the larvae young, however, diazinon is recommended for larger nests and caterpillars. In addition to the fall web worm, the mimosa web worm is a frequent pest of honey locust. It too, is primarily cosmetic in its damage, but it can render trees very unsightly.
To keep up with current pests in the home landscape, check out the Bi-weekly Horticulture Update at http://www.ext.vt.edU/offices/fauquier/h ortupdate.
Chuck Hoysa is the Extension Agent, Horticulture for PD 9, and is located at 24 Pelham Street in Warrenton. Gardening questions may be directed to the Fauquier Master Gardeners at 3417950, extension 19. You may reach Hoysa at crhoysa@vt.edu.
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