Integrated Pest Management Guide

Section	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22

BLACK VINE WEEVIL, Otiorhynchus sulcatus (F.)

Note: All weevils are usually found on dry-pick farms or those not regularly flooded at harvest:

Adult weevils feed on foliage from mid-June until mid-July before egg-laying begins. Eggs are laid in mid-July at the soil surface beneath the vines and hatch 2 - 3 weeks later in August. The newly emerged larvae descend to feed on rootlets and later on the larger roots and root bark. Larvae feed and grow in the soil from the time they emerge from the egg until pupation the next spring.

Monitoring: On warm, still nights after dusk, in early July, sweep beds once or twice a week until eggs begin to mature within the adult weevil and egg-laying begins. To determine the presence and maturity of eggs within an adult weevil, pinch the abdomen of about 10 weevils and look for spherical white eggs. When ready to lay eggs, the weevil's entire abdomen contains eggs and little else. If weevils are found, treatment is recommended. Refer to the section "KEY PESTS: DORMANT TO PRE-BLOOM" for more information on control.


Black vine weevil