Bagworms are beginning to hatch. Most often bagworms are seen on Eastern red cedar and junipers, but can be found on arborvitae, spruce and pine. They also can be found on many species of broadleaf trees and shrubs. The insect hatches from mid-May to mid-June.
The newly emerged bagworm is 1 millimeter long, which is hard to see. Within one week the insect is 3 to 4 millimeters long. The young larvae immediately begins to feed and construct a bag around itself. As the insect grows, the bag increases in size and eventually will be large enough to encompass the larvae.
To control the insect it is essential to get a thorough coverage of chemical throughout the host plant. In trees and shrubs with dense foliage extra care should be taken to get chemicals on the inside of the plant. Heavily damaged evergreens may not recover from the damage. Deciduous trees will normally recover. Early detection and treatment are essential for control of the bagworm.
An organic product Bacillus thuringienses (Bt) is effective and marketed under the names of DiPel, Thuracide, Cutlass, Crymax, Condor and Mattch. Other chemicals that effectively control the insect include such products as Orthene, Turcam, Talstar, Sevin and Dursban. There are other products that will also control bagworms. Read the label before purchasing a product to be sure it is registered for the bagworms. Follow the label's directions.
-- The Garden Calendar is sponsored by K-State Research and Extension-Douglas County and written this week by Extension Director Dennis Bejot. For more information call the Master Gardener Hotline, 843-7058, 1 p.m. to 4 p.m. Monday through Friday.