Cabbage Maggot Control, 1983

The plot was planted and treated 22 Jun. at our vegetable crops research farm near Geneva, N.Y. in a lima silt loam soil. Seeds (planted at 10 per ft) and treatments were applied using cone seeders. Germination counts were made 14 July. The crop was then thinned to approximately one plant every 18 in. Plots consisted of a single row, 20 ft long, replicated four times in randomized complete block. Insecticide applications were based on a 36-in. row width. In-furrow liquid applications were made with a gravity system mounted on a cone seeder delivering 50 gal/acre. Incorporated treatments were applied at 75 gal/acre using a CO2 powered sprayer mounted on a cone seeder. The 4-in. wide band of spray was then planted through, resulting in a slight mixing of the insecticide into the seed-furrow. Drench treatments timed for the third fly peak were applied on 15 and 19 Aug., using a tractor-mounted sprayer delivering 93 gal/acre through two nozzles per row directed to the bases of the plants. Injury ratings were made 29 Sept. by pulling 10 roots per plot, washing them, and counting the number of tunnels present.