Listronotus maculicollis
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Listronotus maculicollis (Kirby, 1837) - (annual bluegrass weevil)
The weevil is a serious pest of annual bluegrass (Poa annua) on golf courses in north-eastern North America, where it can reach densities of 5000 larvae per m2 and can kill patches of the turf. It also feeds on some other grass species. Although the weevil is considered to be native to that region, it was only noticed to cause damage to annual bluegrass since 1931. By the late 1950s and early 1960s it was responsible for extensive damage to golf courses in Connecticut.
The adults feed on the leaves, 1st to 3rd instar larvae feed on the stems and 4th and 5th instar larvae on the plant crowns. The mature larvae pupate on the soil surface. The life cycle from egg to adult lasts about 2 months. There are normally 3 generations per year. The adult is 3-4 mm long, dark grey to black and overwinters in protected areas like leaf litter.
- Other images of Listronotus maculicollis (by Tim R. Moyer and Tom Murray - click to enlarge)
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