The male moths have two pairs of wings and three pairs of legs. Several days later, males will emerge in search of females who are still in their bags. The young bagworms are hard to see at first; stare intently and watch for the wiggling bags made of bits of plant material. Females never develop wings or leave their bags. The Iowa State University Plant & Insect Diagnostic Clinic will identify your insect, provide information on what it eats, life cycle, and if it is a pest the best ways to manage them. Contact information for each states diagnostic laboratory for U.S. residents. Here is a glimpse into the various Bagworm life stages – The eggs of Bagworm moths hatch in end of May and beginning of June. A mated female lays between 500 and 1000 eggs within the bag, after which she dies. Immediately after hatching, some of the caterpillars release a streamer of silk and are blown by the wind, establishing new infestations on nearby trees. They feed and construct their case for about three months. Eggs hatch and caterpillars crawl out of the bag, forming a shelter over their bodies with silk and plant material … They are easiest to identify by the bags they construct as they feed. Treatment in late June to early July before bags exceed 1/2-inch long is recommended. Life Cycle and Habits Bagworms spend the winter as eggs inside the female's bag. Very young larvae may carry their bags in a snail-like manner for a short time (Figure 3). Pupal case exposed after male bagworm emergence. Ames, IA 50011-2031 (800) 262-3804, Iowa State University | PoliciesState & National Extension Partners, Like us at Plant and Insect Diagnostic Clinic, Like us at Department of Plant Pathology and Microbiology. Bagworms complete their growth in August or early September. Figure 1. When a suitable host plant is found the young larva immediately begins to form a new bag over its body. Once the larvae hatch, they spin a case of silk and coat it with debris to protect them. Will the bare areas green back up in spring? When they reach a suitable host, the larvae begin to feed and produce silk to construct individual bags around their bodies (Figure 2). Young larvae hatching from the eggs are approximately two mm long, glossy black on the back and dull amber on the undersurface of their bodies. 2150 Beardshear Hall Small larvae are more vulnerable to insecticides, and feeding damage is relatively minor. Mating occurs with the male outside the bag and female inside. The caterpillars crawl part way out of the bags to feed. They spin down on a thin strand of silk (a habit known as “ballooning"). It is important to watch for the tiny caterpillars and treat only when caterpillars are present. They are easily blown to other plants. Soon after hatching, a worm about the size of a pencil lead starts eating the foliage. Although many plants are dormant in winter, your yard still needs some TLC during the winter months. Nebraska Extension Entomologists Jonathan Larson and Jody Green identify bagworms and talk about what you can do to control them. The silken texture of the bag is hidden and strengthened by layers of leaves, twigs and bark fragments arranged in a crosswise or shingle fashion. Contact information for each states diagnostic laboratory for U.S. residents. Adult male bagworm adhered to a pheromone-baited sticky trap. In late May through mid-June, eggs hatch and the larvae crawl out the bottom of this bag. Bagworms have a single generation per year and overwinter as eggs inside the female bag. These larvae on a string are often picked up by the wind and ballooned to nearby plants. Larvae will settle to feed on lower branches or may be blown to nearby plants during the ballooning stage. Remove and burn or finely chip severely infested trees within and around the plantation. Once the eggs hatch, the larva spins a silk strand that hangs down it. The lifecycle of a bagworm is nothing special. Bagworms complete their life cycleby going through four stages: The eggs are deposited inside the female’s bag where they will overwinter. There may be 300–1,000 eggs in a bag. The bag is attached to branches of the host with loose strands of silk and can be moved to get to fresh plant material (Figure 5). Like other moths, they progress from egg to caterpillar (this species has 7 caterpillar instars, or stages), and full-grown caterpillars pupate, then become sexually mature adults. The female moth will lay her eggs and then plug the bottom hole to protect the eggs. [citation needed] Systematics. By entering your email, you consent to receive communications from Penn State Extension. Inspect new seedlings for signs of bags; remove bags. In the early fall, the male bagworm emerges as a moth and goes in search of female bagworms. Bagworm life cycle in Kansas City Bagworm eggs hatch in late May or early June, which makes this the ideal time to eradicate them. Each female can produce 300–1,000 eggs before dying. Courtesy of Tracey Olson, PDA, Figure 8. Since some bags contain only males, not all bags examined will contain eggs during the winter. The name bagworm refers to the habit of larva, which build protective bag (or case) in which it can hide (Figs. You must have JavaScript enabled in your browser to utilize the functionality of this website. Along with the silk they produce, bagworms use twigs and needles to create their bags. The eggs will remain inside the female's mummified body, inside her bag, through the winter. Each constructs a small bag around its … Deer have eaten the foliage on the bottom portions of several arborvitae. until they pupate. The Case of the Indian Pipes. The robust body of the caterpillar is pale yellow, mottled with black, and may be up to 1½ inches (38 mm) long when mature. This bag is only about 1/8 inch lon… Bagworms overwinter as eggs inside the bag constructed by the female (Figure 1). See All Pest, Disease and Weed Identification, See All Beer, Hard Cider, and Distilled Spirits, See All Community Planning and Engagement, Pollinators and Pesticide Sprays during Bloom in Fruit Plantings, Orchard IPM - Integrating Neonicotinoid Insecticides, All species of Christmas trees and ornamental conifers, Occasionally found on deciduous trees and shrubs, Host list includes more than 120 species of trees and shrubs, Brown, conelike bags hanging from branches, Gypsy moths occasionally defoliate some Christmas trees, Grass bagworm and snail-cased bagworm occasionally found on conifers but do not cause damage.

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