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Annual variation in the abundance of Metopolophium dirhodum, Sitobion avenae, and Rhopalosiphum padi on leaves of winter wheat at the time of peak abundance. (A) Average (±SE) abundance (n individuals/tiller). In 1992, average abundance of M. dirhodum was 191 ± 121.4 aphids/tiller. (B) Percentage of particular species in the total aphid population at the time of maximum abundance.
