Toxicity of Some Herbicidal Sprays to Honey Bees1,2,3

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Various formulations and combinations of herbicides and carriers were sprayed on small cages containing Apis mellifera L. Daily counts of dead bees were made for 14 days after treatment to determine toxicity. Monosodium methanearsonate (MSMA), paraquat (1,1'-dimethyl-4,4'- bipyridinium dichloride salt), and cacodylic acid (hydroxydimethylarsine oxide) were highly toxic. Diesel oil and Mobilsol 100® (phytobland oil) caused high mortality the 1st 24 hr after treatment and very little the following days. Combinations of diesel oil-water and diesel oil-water-dimethylsulfoxide (DMSO) were less toxic than diesel oil alone but more toxic than water. Several formulations and combinations of 2,4-D ((2,4-dichlorophen. oxy) acetic acid) ; 2,4,5-T ((2,4,5-trichlorophenoxy) acetic acid); silvex (2- (2,4,5-trichlorophenoxy) propionic acid) ; and picloram (4-amino-3,5,6-trichloropicolinic acid) were nontoxic when applied in a water carrier as were endothall (amine salt of 7-oxabicyclo (2.2.1) heptane-2,3-dicarboxylic acid), and a 1:1 mixture of the triethylamine salts of 2,4,5-T and picloram.

Document Type: Research Article

Publication date: February 1, 1972

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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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