Appraisal of Insecticidal Granules in the Row Against Damage by the Northern Corn Rootworm

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Abstract
A small-plot (single row 40 ft. long) experiment was used to evaluate granular insecticidal formations in the corn row against the northern corn rootworm, Diabrotica longicornis (Say). Previously weighed quantities of granules were drilled into the soil above the seed by means of a V-belt seeder. A rootworm population of 45 insects per untreated plant on late-planted (May 25-26) corn resulted in plant lodging ranging from 0.6% to 100% among the various treatments. Untreated plots had 96.6% lodging. Twenty per cent heptachlor on attapulgite granules was less effective than 5% and 10% formulations and heptachlor on 8/15 mesh particles provided less protection from lodging than formulation prepared with 15/30, 20/35 and 30/60 mesh granules. These differences were demonstrated with one-half the recommended 0.5 pound per acre rate of toxicant. Attaclay, Florex,and Creek-O-Nite clays were found to be satisfactory granular carriers for heptachlor. Telodrin Insecticide (1,3,4,5,6,7,8,8 octachloro 3a,4,7,7a-tetrahydro-4,7-methanophthalan) and phorate of 13 candidate insecticides provided a high degree of protection against the rootworm when used at 1 pound per acre. Untreated corn in this test produced 16% barren stalks while protected corn averaged 2% unproductive stalks.

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