Abstract
The experimental insecticide carbofuran provided outstanding control of Diabrotica longicornis (Say) larvae when applied on 3 dates. Each of 5 approved corn rootworm insecticides were applied to separate plots on 9 successive dates to compare the relative merits of cultivation-time treatment (June) as opposed to planting-time treatment (May). Phorate, Dasanit® (O, O -diethyl O-[p-(methyl-sulfinly) phenyl] phosphorothioate), and BUX® 3:1 mixture of m -(1-methylbutyl) phenyl methylcarbamate and m -(1-ethylpropyl) phenyl methylcarbamate) gave equally good protection applied in either May or June. Dyfonate® (O -ethyl S -phenyl ethylphosphonodithioate) performed better when applied at planting time in May, but diazinon gave best results when applied at cultivation time in June. Overall, there was an 82.5% reduction of corn rootworm larvae in corn roots from these treatments.
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