Loxostege

Hübner, 1825

webworms, meadow moths

Species Guides

20

Loxostege is a of in the Crambidae, commonly known as webworms or meadow moths. The genus includes economically significant agricultural pests, particularly L. sticticalis (beet webworm/meadow moth), which is a causing substantial crop damage across North America, Europe, and Asia. Species in this genus exhibit complex including larval , long-distance capabilities, and high reproductive potential. Many species are characterized by dynamics with cyclic explosions.

Loxostege by (c) Catherine C. Galley, some rights reserved (CC BY), uploaded by Catherine C. Galley. Used under a CC-BY license.Loxostege commixtalis by no rights reserved, uploaded by Robbie Hannawacker. Used under a CC0 license.Loxostege munroealis by (c) jimeckert49, some rights reserved (CC BY). Used under a CC-BY license.

Pronunciation

How to pronounce Loxostege: //lɒkˈsɒstɪdʒi//

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Habitat

Agricultural fields, meadows, and areas with abundant herbaceous vegetation; includes cultivated crops such as sugar beet, corn, potato, cotton, tobacco, alfalfa, clover, pea, sunflower, vegetables, and grains; also colonizes field edges, roadsides, and uncultivated areas with wild plants including Chenopodium and Convolvulus. Larvae of diapausing overwinter in soil cocoons near the surface.

Distribution

Holarctic distribution encompassing North America, Europe, and Asia. Documented from Canada (Alberta, Ontario), United States (widespread including Vermont, Montana, Colorado), Mexico, Northern Europe (Denmark, Norway, Sweden), and across Eurasia including Russia, Ukraine, Mongolia, China, Turkey, Iraq, and Azerbaijan. Some show transcontinental patterns.

Diet

Larvae are herbivores feeding on over 250 plant . Major include sugar beet, corn, potato, cotton, tobacco, alfalfa, clover, peas, sunflower, barley, wheat, sorghum, rapeseed, flax, grapes, melons, gourds, and various vegetables. feed on nectar and compete with such as honey bees for floral resources.

Life Cycle

Complete with variable time depending on latitude and temperature. Development includes , larva (typically 5-6 instars), pupa (in soil cocoon), and stages. Generations per year range from 1 in cold regions to 3-4 in southern areas. Embryonic development: 7-15 days at 28°C. Larval stage: 10-30 days (14-17 days at optimal 25-30°C). : 14-30 days. Adult lifespan: 4-20 days (typically 4-5 weeks). Larval occurs in response to short-day ; larvae cold- to -30°C.

Behavior

Mass cycles occur every 6-10 years. Two distinct strategies: active for 20-25 km seeking flowering plants and oviposition sites, and passive long-distance via air currents up to 900-1000 km. are and , hiding in dense vegetation during hot sunny days. Adults easily disturbed during daytime. Young larvae web leaves together; older larvae feed openly and are highly mobile, capable of migrating between fields.

Ecological Role

Major agricultural pest causing 50-100% crop loss during mass . Serves as for diverse natural enemies including (Braconidae, Ichneumonidae), tachinid flies, parasitoids (Trichogamma), and predatory mites. Preyed upon by birds and ground beetles (Carabidae). Competition with honey bees for nectar resources may reduce honey yields.

Human Relevance

Significant economic impact as agricultural pest; L. sticticalis added to China's National Class I list of crop insect pests in 2020. Subject of research including agents, -based monitoring, and resistance studies. Pheromone chemistry characterized for and trapping programs. Climate change may be expanding frequency and geographic range.

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