Evaluation of Insecticides for Carrot Weevil Control, 1980

Celery was transplanted on Apr 24, 1980, at the Muck Crops Research Station, OARDC, Willard, Ohio. Two row plots,. 25 ft long on 24 inch centers, were replicated 3 times in a completely randomized block design. Soil type was organic muck. Rows were planted in a north-south direction perpendicular to an east-west row of willows used as a wind break where the carrot weevil overwinters. Each plot was bordered by 6 rows of onions planted as a non-host crop border to minimize between plot movement by the carrot weevil. Traps baited with carrots were placed along the willow row and sprays were initiated on May 8, 1980 coinciding with first capture of adult carrot weevils. Directed sprays were applied with a tractor driven sprayer at 2 mph delivering 50 gal of spray at 30 psi. Damage was evaluated on Jun 11, 1989 by digging 10 celery plants/row (20/plot) at the south end of the row nearest the willow row and counting numbers of plants infested with carrot weevil.