Yield reductions, maturity delays, and stunting due to injury to seedling sorghum by yellow sugarcane aphid (YSCA), Sipha flava (Forbes), were investigated in field trials in Central Texas in 1983 and 1984. Regression analysis indicated that yield reductions were significantly related to both YSCA density and plant discoloration symptom ratings. Per panicle yield reduction of plants infested when they averaged 4–6 cm tall was 1.1 g or 2.5% per aphid and 6 g or 15% per unit increase in discoloration rating. Plant height was reduced 2.7% per aphid or 6% per unit increase in discoloration rating. Maturity was delayed 0.5 days per aphid and 1.5 days per unit increase in discoloration rating. Tolerance to YSCA injury increased greatly with very slight increases in plant height. Seedling sorghum plants 3.5, 4.5, and 5.5 cm tall infested with an average of six aphids per plant had mean yield losses of 67, 30, and 7% respectively.
Document Type: Research Article
Publication date: August 1, 1986
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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.