Efficacy of Liquid Starter Fertilizer-Insecticide Combinations for Control of Resistant Northern Corn Rootworm Larvae

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Granular and spray formulations of several insecticides alone and in combination with liquid starter fertilizer were evaluated during 1970–72 in Ohio for control of resistant larvae of Diabrotica longicornis (Say). Insecticides and formulations included in one or more tests were: Bux® (m-(1-ethylpropyl) phenyl methylcarbamate mixture (1–4) with m-(1-methyl = butyl) phenyl methylcarbamate), 10G and 2E; diazinon, 14G and AG500; Dyfonate® (O-ethyl S-phenyl ethylphos = phondithioate), 20G, 4E, and 2F; and phorate, 15G and 4EC. All insecticides were applied at 34 g AI/0.305 km of corn row.

Spray and granular formulations of all insecticides performed significantly better in all years and over all planting dates than the liquid starter fertilizer-insecticide combinations placed on one or both sides of the corn row and 5.08 cm below and 5.08 cm to the side of the seed. Excessive rainfall in combination with very early planting contributed to unacceptable performance of all treatments in 1971. Although liquid starter fertilizer-insecticide combinations provided some protection, they were inconsistent. An insecticide must be evaluated in combination with liquid starter fertilizer prior to being recommended.

Document Type: Research Article

Publication date: October 1, 1974

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