SUMMARY Field caged populations of Metopolophium dirhodum were established on winter wheat (cv. Norman) during the late spring and summer of 1983. An early (G. S. 30–41), middle (G. S. 41–65) and late treatment (G. S. 65–77) were compared. Yield losses were 5, 8 and 27% respectively, although aphid indices were similar in the three treatments. For other field cage populations, all established at G. S. 38 and allowed to develop freely, a significant negative relationship existed between aphid index and yield.
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Holt et al. (1984) studied this question.