Cabbage Maggot Control in Transplanted Cabbage, 1990

Abstract

Abstract Two plots were transplanted for testing of insecticides for cabbage maggot control using a 2-row transplanter dispensing about one cup of dilute fertilizer solution/plant. The directed insecticide sprays were applied to the bases of the plants using a CO2 backpack sprayer delivering 255 gal/acre. The diazinon transplant treatment was planted by hand using the same rate (1 cup) of the dilute fertilizer solution but with the addition of diazinon to the solution. Injury ratings were made on 14 Aug and 30 Oct by pulling 10 roots/plot, washing them, and counting the number of tunnels present. The first plot, transplanted on 15 Jun, was established on the Robbins Farm using the variety 'Atria.' These plants were pulled in Maryland during the last week in May and remained in cold storage (38°F) for at least 2 wk prior to planting. Soil conditions at the time of the planting of this plot were extremely poor, the soil being parched and tilth consisting mainly of large, dry clods. Directed sprays were applied on 20 Jun. The second plot, transplanted 22 Jun, was established on the Hansen Farm using the variety Titanic.' These plants were pulled locally on the day prior to planting and spent no time in cold storage. Soil conditions at the time of the planting of this plot were extremely good, the soil possessing both adequate moisture and good tilth. Directed sprays were applied on 28 Jun.