Billbug Vs Bluegrass Weevil

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Sphenophorus parvulus or commonly known as the bluegrass billbug is part of the weevil family under the order coleoptera. It gets the name billbug because of the long snout and extended thorax. This insect is considered as a turfgrass pest causing destruction primarily to Kentucky bluegrass, but also perennial ryegrass, fine fescues, and tall fescue. Description The bluegrass billbug and the bluegrass weevil are very similar, but there are distinct differences between the two such as the size difference and the antennae occur at the base of the snout rather than the tip. Billbugs become active and cause most of there destruction in summer time between June to August when the are adults, larvae and pupae. The third-instar larvae are about ¼-3/8 inches long and have brown head, white, and legless. Adult billbugs are difficult to locate in turf, but during the spring time, they can be found crossing driveways and sidewalks. They are about 3/8 inch long and are gray to brown to black. Life Cycle …show more content…

The adults overwinter in leaf litter and thatch until spring time when the temperature warm up. The adults become active seeking new areas to lay eggs and can be seen walking across pavement. The females lay white, kidney shaped eggs with in grass stems that are hollowed out. It takes about 7-14 days for the white larvae to hatch from the eggs and proceed to live and feed within the grass stem until its third-instar. During the second instars cycle, the larvae eat their way through the grass stem, breaking themselves out. The larvae go on to complete their third instar cycle in the thatch feeding roots and crowns. The larval stage takes about 5 to 8 weeks to complete before pupation occurs in the soil. The pupae are about 1 to 2 inches long and emerge as adults in about 7-10 days. They continue feeding on grass until they find their new overwintering site before temperatures begin to drop

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