Abstract
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 poplars. 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 6 replications. Plots measured 1 row × 60 m. Surviving stand was evaluated 14 Jun by counting all live plants; wilting, severely stunted, or “dead heart” plants were excluded. Final stand, ear number and yield, adjusted to 15.5% moisture, were measured at harvest on 23 Oct. Because a thrown chain caused insecticide misapplication on some plots, a GLM was used and least-square means were calculated.
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