Systemic Insecticides as Lygus Bug Controls Compatible with Bee Pollination on Alfalfa1
Authors: JOHANSEN, CARL; EVES, JACK
Source: Journal of Economic Entomology, Volume 60, Number 6, December 1967 , pp. 1690-1696(7)
Publisher: Entomological Society of America
Abstract:Two low-bee-hazard methods of control, the use of granular insecticides and application of insecticides through a sprinkler irrigation system, were tested against Lygus Hesperus Knight and L. elisus Van Duzee in alfalfa grown for seed. Only dimethoate provided control of lygus bugs when applied through irrigation sprinklers. However, such applications at higher than normal dosage rates to blooming alfalfa apparently caused a low mortality to alfalfa leafcutting bees, Megachile rolundala (F.), by nectar contamination. Dimethoate applied after hay cutting and before development of seed crop blooms was non-hazardous to bees. Temik® (2-methyl-2- (methylthio) - propionaldehyde O-(methylcarbamoyl)oxime), Baygon® (0- isopropoxyphenyl methylcarbamate), and NIA-I0242 (Furadan® (2,3-dihydro-2,2-dimethyl-7-benzofuranyl methylcarbamate) granules provided nearly 7 weeks control of lygus bugs at 2 to 3 lb per acre in both aerial broadcast and ground side-dressed applications. Temik at 5 lb per acre gave from nearly 7 weeks to more than 3 months control of lygus bugs and also controlled pea aphids Acyrtho siphon pisum (Harris). Granular systemic insecticides were not effective until irrigation was applied, but either sprinkler or rill irrigation sufficed. Beneficial predators either were not seriously reduced or were able to recover in time to keep aphids below economic levels. Trichlorfon performance was improved by timing the second application about 10 days after the first, killing the early lygus instars winch had hatched out in the meantime, Abate®(O,O-dimethyl phosphorothioate O,O diester with 4,4'-thiodip.henol) provided 3 weeks control of lygus bugs, but was highly toxic to the alfalfa leafcutting bee and moderately toxic to the alkali bee, Nomia melanderi Cockerell.
Document Type: Research Article
Publication date: December 1, 1967
- 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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