Facts, Identification & Control
Approximately 12 mm in length, black vine weevils are ovoid in shape and are covered with tiny hairs. They range from brown to gray in color and possess short snouts. The antennae of these weevils feature elbows, and their wings bear small pits.
Behavior, Diet & Habits
The black vine weevil (Otiorhynchus sulcatus) is present in much of the northern United States and is found throughout the state of Ohio.
Black vine weevils are known to attack various plants, trees, shrubs and herbs. Adults feed on leaves and stems of plants, while larvae feed on fine and main roots. The feeding behavior of black vine weevil larvae causes more damage to affected plants than that of adults.
Females emerge in early summer and will feed for about a month before laying eggs. She may lay almost 200 eggs in her life. The eggs hatch and the larvae feed on the roots of the plant. Larvae spend the winter in a dormant state and will pupate the following spring.
Signs of a Black Vine Weevil Infestation
Adults cause damage to the foliage of the plant, which may show notches from their activity. Larval activity is more difficult to detect since they are underground.
Black vine weevils can be challenging to control. There are very few natural predators of this weevil species. They are also nocturnal in nature and tend to dwell in subterranean environments. Pesticides may be sprayed upon the leaves of infected plants in order to address adult specimens. Contact a local agricultural specialist for guidance.