Agriotes obscurus is a major soil-dwelling pest in Europe and parts of North America. Like other wireworms, it is the larval stage of a click beetle.<\/p>\r\n
The larvae live hidden in the soil for several years and feed on germinating seeds and plant roots. Their long life cycle and underground feeding habit make them difficult to detect and control.<\/p>\r\n
This species is highly polyphagous and can cause significant losses in root crops and field crops.<\/p>","at_a_glance":{"host_plants":"Potato, maize, grasses, legumes, carrot, lettuce, onion","where_you_see_it":"In soil near roots and germinating seeds","seasonality":"Larvae present year-round; adults emerge mainly in spring","typical_damage":"Poor germination, root feeding, wilting plants, tuber tunneling"},"difficulty":"high: High","virus_risk":"none","sections":{"identification":"
Larvae are similar in appearance to other Agriotes species and are difficult to distinguish without detailed examination.<\/p>\r\n
Larvae<\/p>\r\n\r\n
Slender, cylindrical, hard-bodied<\/p>\r\n<\/li>\r\n \t
Shiny yellow to brown<\/p>\r\n<\/li>\r\n \t
Up to 20 mm long<\/p>\r\n<\/li>\r\n \t
Live several years in soil<\/p>\r\n<\/li>\r\n<\/ul>\r\n
Adults<\/p>\r\n\r\n
Brown click beetle<\/p>\r\n<\/li>\r\n \t
7\u20139 mm long<\/p>\r\n<\/li>\r\n \t
Produces clicking sound when flipping over<\/p>\r\n<\/li>\r\n<\/ul>\r\n
Key Clues<\/p>\r\n\r\n
Patchy plant stand<\/p>\r\n<\/li>\r\n \t
Seedlings collapsing after emergence<\/p>\r\n<\/li>\r\n \t
Feeding holes in tubers<\/p>\r\n<\/li>\r\n \t
Larvae present when digging around roots<\/p>\r\n<\/li>\r\n<\/ul>","damage":"
Larvae feed on underground plant parts, including seeds, roots, and tubers.<\/p>\r\n
In potatoes, feeding creates deep tunnels that reduce market value. In cereals and maize, seedlings may fail to establish due to seed destruction.<\/p>\r\n
Damage is often more severe following conversion of grassland into crop production.<\/p>","life_cycle":"
Eggs are laid in soil at shallow depth.<\/p>\r\n
Larvae hatch and develop over 3\u20135 years in soil.<\/p>\r\n
Larvae move vertically in response to soil moisture.<\/p>\r\n
Pupation occurs in the soil, lasting several weeks.<\/p>\r\n
Adults emerge and may overwinter underground.<\/p>","monitoring":"
Inspect fields with poor plant establishment.<\/p>\r\n
Use pheromone traps to monitor adult beetle populations.<\/p>\r\n
Dig around damaged plants to confirm larval presence.<\/p>\r\n
Monitoring before planting is essential in high-risk fields.<\/p>","management":"
Cultural control: Avoid planting susceptible crops directly after grassland and use crop rotation to reduce risk.<\/p>\r\n
Soil management: Improve drainage and avoid persistently moist soils that favor larval survival.<\/p>\r\n
Chemical control: Soil-applied insecticides may reduce damage but are often limited due to the long larval lifespan.<\/p>"}},"_links":{"self":[{"href":"https:\/\/cubescircle.de\/en\/wp-json\/wp\/v2\/organisms\/5365","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cubescircle.de\/en\/wp-json\/wp\/v2\/organisms"}],"about":[{"href":"https:\/\/cubescircle.de\/en\/wp-json\/wp\/v2\/types\/organism"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cubescircle.de\/en\/wp-json\/wp\/v2\/media\/5379"}],"wp:attachment":[{"href":"https:\/\/cubescircle.de\/en\/wp-json\/wp\/v2\/media?parent=5365"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}