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Affected Grasses: In northern areas, the bluegrass billbug favors Kentucky bluegrass. In the south, the hunting billbug favors zoysia, and occasionally Bermuda. Central and Midwestern states have both species of billbugs. Identification: Billbug larvae are legless white grubs. They measure about 3/8” long and are very fat, with a larger tail end than head end. The head capsule can vary from orange to brown in color. Adult billbugs are weevils that can vary in color from dark gray to black. They are also 3/8” long and have a long snout. Damage: Damage occurs in the larval stages. The larvae burrow downward inside the grass stems and chew on the stem base, crowns and roots. Injured plants break off easily at the crown when pulled. A fine, light brown “sawdust” is visible in the root zone and on the broken stems of affected plants. Damage can be seen as spotty patches of yellow or dead grass. Injury frequently occurs near sidewalks and driveways, but entire lawns can be affected. The bluegrass billbug does its damage from July to August. The hunting billbug does its damage from June through October. Control and Management: This insect is controlled in the larval and adult stage through an application of surface insect control. It is important however, to remember to water this product in ensure control.
Billbug damage in July
Adult Billbug