Predisposition to Pythium Seedling Disease and an Activated Charcoal- Fungicide Interaction as Factors Influencing Emergence of Cotton Seed Treated with Phorate1

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Abstract:

Seed treated with Ceresan 100 or 200 (mixtures of ethyl mereury 2,3-dihydroxypropyl mercaptide and ethyl mercury acetate) and subsequently treated with proprietary ph orate (formulated as 44% chemical on charcoal) showed less protection against pre-emergence damping-off in unsterilized soil than seed treated only with Ceresan. This effect was more evident and severe at soil temperatures of 6 than at 21 to 24. No re- duction in emergence of seed treated with phorate-Ceresan occurred in steamed pathogen-free soil except when it was artificially infested with pathogenic Pythium spp. In naturally infested soil, treatment of seed with charcoal in addition to Ceresan reduced emergence but not so severely as treatment with phorate-Ceresan. This suggested that the charcoal carrier interacted with Ceresan and that the active chemical in phorate predisposed the seed to pathogenic Pythium spp. The emergence-reducing effect was less marked at 2 pounds of proprietary phorate per 100 pounds of seed than at 8 pounds. When seeds treated with Di-Syston® (O,O-diethyl S-2-(ethylthio)ethyl phosphorodithioate), a similar systemic insecticide, and Ceresan were planted in naturally infested sci', the emergence ,,'as not reduced. Emergence was delayed, however, and seedlings were temporarily stunted in steamed pathogen-free soil.

Document Type: Research Article

Publication date: October 1, 1961

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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