Bagworms Bagworms
can damage juniper, arborvitae, pine, and spruce. Description, life history, and
control are discussed in this publication.The bagworm is native to the United States and is found in eastern Nebraska. Bagworms feed on many species of trees and shrubs, but are most common on junipers. They are rarely a serious problem on deciduous trees, except when larvae move away from evergreens. Damage In urban areas, bagworms are most common on evergreen trees and shrubs. Juniper, arborvitae, pine, and spruce may be killed if completely defoliated. Less severe attacks can slow growth. Bagworms feed on shade, orchard, and forest trees of nearly every kind, as well as many ornamental shrubs and perennials. Severe attacks are unusual. Since deciduous plants grow new leaves, damage to them is usually not serious. The growth of small or newly planted trees, however, could be slowed by leaf feeding. Description Newly hatched larvae begin to spin silken bags around themselves shortly after hatching. The first evidence of infestation is the presence of 1/4 inch bags which are carried almost on end by the young caterpillars inside. As larvae grow, leaf fragments are added to the bag, which may reach a length of 2 inches by the end of summer. The adult female moth is wingless and never leaves the bag. Adult males are small, grey moths with clear wings. Life History Bagworms overwinter in the egg stage inside female bags fastened to twigs. Eggs hatch in late May and early June, and larvae feed until late August or early September. Males emerge in September and mate with females through the bag entrance. Cultural Control Control infestations on small trees and shrubs by removing bags during the winter and spring before the eggs begin to hatch in late May. Destroy bags by burning, immersing in kerosene or by crushing. If bags containing larvae are discarded on the ground, the larvae can return to host plants. Chemical Control  Chemical controls are effective if applied during early stages of bagworm development. For most effective insecticidal control and prevention of damage, apply sprays from mid- to late-June. Talstar
You can also use Generic brand Bifen and save money. It has the same ingredient as Talstar One.
Issued in furtherance of Cooperative Extension work, Acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture. Elbert C. Dickey, Director of Cooperative Extension, University of Nebraska, Institute of Agriculture and Natural Resources. University of Nebraska Cooperative Extension educational programs abide with the non-discrimination policies of the University of Nebraska-Lincoln and the United States Department of Agriculture. |
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