The furrowed weevil (also rag weevil) belongs to the family of weevil and occurs in large parts of Europe, North America and Australia. The long-known insect occurs as an important pest of many plants and also of vines on. The flightless beetle is about a centimeter long, gray-black colored and has a spatially elongated and clearly furrowed head with long, bent antennae, which gave it its name. The hibernation takes place in the ground as a beetle, pupa or larva. The females, which live for two to three years, can develop up to 800 eggs in the course of their life, which they lay superficially in the soil in the vicinity of the plant throughout the season. After one to three weeks, the ivory-colored and brown-headed, the Engerling the cockchafer very similar larvae and attack the roots.
This can lead to the death of the vines, in young plants and nurseries this can be devastating. After the larvae have reached a certain size, they go into hibernation as a pupa. In the spring, the pest (female only) migrates to the surface of the earth and usually climbs the vines at night to feed on the buds that are still closed or on the bottom leaves. But this is less dangerous than the root damage. The leaves are gnawed from the edge, which results in a typical feeding pattern (U-shaped pitting) with round spots. Black droppings around two millimeters long are also typical. A similar, also vine-infested species is the lovage weevil . Conventional pest control is usually carried out by insecticides, The larvae in the soil are also made using special nematodes combated biologically. See also under Vine enemies,
Images: © Thomas Lohrer