Seed Treatment with Systemic Insecticides for Control of Spotted Alfalfa Aphids under Kansas Conditions1
Authors: BISHOP, JACK L.; BURKHARDT, C. C.
Source: Journal of Economic Entomology, Volume 52, Number 4, August 1959 , pp. 714-719(6)
Publisher: Entomological Society of America
Abstract:Seed was treated with demeton at the concentration-time combinations of 0.25% for! hour soaking, 0.5% for! and 1 hour soaking. Ronnel, Thimet® O,O-diethyl S-(ethylthio)methyl phosphorodithioate), and Di-Syston® (O,O-diethyl S-2-(ethylthio) ethyl phosphorodithioate) were tumbled with seed as dry treatments at the rates of 1, 2, and 4 pounds of toxicant per 100 pounds of seed.No significant reduction occurred in germination or emergence when seed was treated with Thimet or Di-Syston. Slight emergence reduction occurred in seed treated with Ronnel. Both germination and emergence were reduced after 6 months of storage of seeds treated with demeton, probably resulting from inadequate drying of seed following soak treatment.Seed was planted immediately, 1 week, 1 month, 6 months, and 1 year after treatment. Treatments showed no reduction in aphicidal effectiveness after storage. No visible phytotoxic effects were observed in any of the treated alfalfa except for a temporary browning of the leaf margins of alfalfa treated with ronnel.The best over-all results were obtained using Di-Syston at the rates of 2 and 4 pounds toxicant per 100 pounds of Seed. These rates gave 100% control for the entire 6-week period. The 1- pound rate of Di-Syston gave above 95% control throughout the period. Thirnet at 4 pounds gave 100% control through the fourth week and good control for the remainder of the 6-week period. The 2 pound rate proved to be 100% effective through the fourth week, 85% effective through the fifth week, and over 75% effective through the sixth week. The 1-pound rate gave satisfactory control only through the fourth week.Statistical analyses indicated no significant differences occurred between any rates used in Di-Syston or between the 4-pound rate of Thimet and any rate of Di-Syston. Ronnel and demeton were generally ineffective beyond the second week.
Document Type: Research article
Publication date: 1959-08-01
- 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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