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Efficacy of using seed and foliar insecticides to control Chaetocnema pulicaria and Stewarts disease of corn

Menelas, B.; Esker, P.D.; Nutter, F.W.J.

Phytopathology 93(6 Suppl): S61

2003


ISSN/ISBN: 0031-949X
Accession: 034836227

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Chemical seed treatments have been widely used to control early season infection by Pantoea stewartii, the causal agent of Stewart's disease of corn. The pathogen is vectored by Chaetocnema pulicaria. To assess the efficacy of combining seed and foliar insecticides to control Stewart's disease in seed corn fields, experiments were conducted at Crawfordsville and Johnston, IA in 2001 and 2002. Seed insecticides Gaucho(R) or Cruiser(R), and the foliar insecticide Warrior(R) were evaluated. Applications of Warrior(R) were timed according to corn growth stage, a degree-day model, or an action threshold based on beetle numbers. Combinations of seed treatments with Warrior(R) reduced disease incidence by 42.0% and 39.9% in 2001 and by 66.7% and 56.3% in 2002, compared to the nontreated control. These reductions, however were not significantly different than Gaucho(R) or Cruiser(R) used alone (Pltoreq0.05). Therefore, applying foliar insecticides in addition to insecticide seed treatments may not further reduce incidence of Stewart's disease of corn.

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