Abstract
In greenhouse studies, corn (maize) was the least preferred host for the yellow sugarcane aphid, Sipha flava (Forbes) and had little damage and supported few and small nymphs. Oats had extremely low nymphal production and survival but was moderately preferred and damaged. Rye had intermediate antibiosis but high nonpreference and tolerance. Triticale was intermediate between the parental rye and wheat. Pearl millet was non preferred but had poor antibiosis and tolerance. Feed barley was relatively susceptible, but low levels of resistance were found. All tested entries of common wheat and Sorghum bicolor (L.) were susceptible. The yellow sugarcane aphid on sorghum and barley takes ca. a week longer than the green-bug, Schizaphis graminum (Rondani), to mature sexually, and it reproduces at slower rates. However, it causes even greater plant necrosis and must be considered a serious outbreak pest of sorghum, wheat, and barley.
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