White Grub Control with Soil Insecticides—Large Plot Trial, 1990

Abstract

A natural white grub infestation in a corn/soybean rotation near Boyd, MN, provided the opportunity to evaluate soil insecticide performance. The site, typical of severe P. implicita infestations, was associated with a sandy loam soil near a windbreak of populars. Insecticides were applied at planting on 4 May using planter-mounted Noble granular applicators calibrated to deliver the desired rates at 6.4 km/ha. Treatments were arranged in a randomized complete block design with 4 replications. Plots measured 4 rows × 180 m. Surviving stand was evaluated 27 Jun by counting all live plants; wilting, severely stunted, or “dead heart” plants were excluded. Yield, adjusted to 15.5% moisture, was measured on 23 Oct.