Efficacy of Thiamethoxam Seed Treatments to Control Cabbage Root Maggot in Broccoli, 2014: Table 1

Abstract

Because the feeding by cabbage root maggot (CRM) larvae causes stunting and collapse of cultivated brassicas, stands of spring transplants may be reduced and damage to root crops may occur in the spring and fall. Seed treatments offer a simpler way for growers to apply insecticides compared to soil drenches which require much time and water to apply. We evaluated efficacy of different formulations and rates of thiamethoxam seed treatments compared to imidacloprid applied as a soil drench banded over the row post-transplant. The experiment was conducted at the University of Massachusetts Research and Education Farm in Deerfield, MA in a field with soil classified as Hadley silt loam. Soil was amended with 50 lb urea (46-0-0) (N-P-K) and was further amended with 20 tons/acre of a manure-based compost to increase attractiveness of the site to CRM flies for oviposition. A RCB design was used with 4 replications of 5 insecticide treatments and an untreated check, with 60 broccoli plants per replicate …