Onion Maggot Control in Onions, 1983

Abstract

Onions were planted with a veebelt seeder in 18 in rows at three locations. Plots were: 10 ft of double row x four replications at Grant, (1-in planter shoe, planted 6 May); 19 ft of single row x five replications at the M.S.U. Muck Crops Experimental Farm (1-in shoe, planted 13 May); and 10 ft of double row x six replications at Hudsonville (2-in shoe, planted 5 May). Treatments were arranged in a randomized complete block design and applied in the furrow at planting (granular materials) or in a 2- to 3-in band over the row (soil drenches). Soil drenches were applied at 50 gal/acre with a hand sprayer with the initial application date corresponding to the first appearance of onion maggot eggs. Pydrin 2.4EC (0.1 lb. (AI)/acre) was applied to all plots twice during Aug. for thrips control. After plant emergence, but before onion maggot oviposition, 100-plant sections of row were marked out in each plot. Counts of onion maggot damaged plants within those 100-plant sections were made weekly through the end of the first generation damage (5 July). Stand counts within the 100-plant section were taken on 20 to 21 June and 5 July. Yields were taken from 5 ft of double row per plot at Grant and Hudsonville and 10 ft of single row at the M.S.U. Muck Farm on 29 Sept. and 1 Sept., and 4 Oct., respectively.