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In 1970 and in 1971, 15 and 18 acaricidal treatments, respectively, were compared for effectiveness in controlling Panonychus ulmi (Koch) on apple trees. A comparison of the results for the 2 years indicates that populations of 10 to 20 mites per leaf may be brought under control with several of the tested acaricides almost as quickly as populations ranging from 0.80 to 5.5 mites per leaf. Only Stauffer R-JO044 (N-[(1,1,2,2-tetrachloro-2-Auoroethyl) thio] methanesulfonanilide) caused serious injury to foli- age of ‘Golden Delicious' and 'York Imperial' trees, the apple cultivars in the test. Formetanate monohydro- chloride caused slight yellowing of the leaves of Golden Delicious trees. In 1970, Bay 37344 (4- (methylthio) -3,5- xylyl methylcarbamate) did not control P. ulmi effective- ly. In 1971, dinocap and Dikar® (74% a coordinated product of zinc ion and manganese ethylene bisdithio- carbamate plus 6% dinocap) exhibited only mite popula- tion suppression activity. In both years, of the rest of the acaricides tested, Acarol® (isopropyl 4,4-dibromo- benzilate), Acaralate® (isopropyl 4,4' dichlorobenzilate), and Shell SD-17250 (N-[ (methylcarbamoyl) oxy]thioaceti- midic acid ester with 3-mercaptopropionitrile) exhibited the least residual toxicity to P. ulmi. There were some indications in 1971 that some of the acaricides tested may be less toxic than others to the predatory mites Zetzellia mali (Ewing) and Amblyseius fallacies (Gar- man).
Document Type: Research Article
Publication date: February 1, 1973
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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.