Abstract
SUMMARYField‐caged populations of the rose‐grain aphid Metopolophium dirhodum were established on winter wheat (cv. Bounty) during the summer of 1981. An early wheat growth stage (G.s.) (40 to 69) and a late (G.s. 65 to 73) aphid infestation treatment were compared; only the early infestation resulted in a significant reduction in grain weight (15%), although the infestation sizes were similar in the two treatments. Baking quality of the flour was unaffected by both treatments. Caged populations were also established on winter wheat (cv. Avalon) in 1982 but, in spite of aphid numbers as large as in 1981, no significant yield loss was recorded. An infection of take‐all fungus Gaeumannomyces graminis developed during the course of this experiment and may have masked the effect of the aphids.
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