Oligonychus pratensis (Banks) exhibited no differential preference response for SC 599-6, a previously identified mite resistant sorghum line, when given a choice of that sorghum or a susceptible grain type (Tx 7000), a grassy sorghum (KS 30), or a sweet sorghum (Honey). However, a greater preferential response was recorded for any sorghum line at plant growth stages 2–6 vs. stage 1, 7, and 8. Life span duration did not significantly differ when the mite was reared on SC 599-6, SC 56-6, Tx 7000, B Tx 378, KS 30, 'Sweet Sudan' or Honey sorghums. Mites reared on intact sorghum leaves at growth stages 1–6 had a longer life span (25.7 days) and ovipositional period (11.6 days) than mites reared on sorghum leaf discs at growth stages 6–8 (19.1 and 8.9 days, respectively). However, fewer eggs (4.3) were oviposited daily by females on sorghums at growth stages 1–6 than on sorghums at growth stages 6–8 (11.1). Tolerance appeared to be a major resistance mechanism of SC 599-6 sorghum as test results indicated less damage occurred to that line even when infested with mite populations equal to that on susceptible Tx 7000 or Honey sorghum.
Document Type: Research Article
Publication date: April 1, 1977
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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.