Differential Amounts of Material Taken up by Four Biotypes of Corn Leaf Aphids from Resistant and Susceptible Sorghums1

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Abstract
Measurement was made of the differential amounts of the plant material taken by individuals of four biotypes of the corn leaf aphid, Rhopalosiphum maidis (Fitch), from resistant Piper Sudan 428–1 and susceptible White Martin sorghums. All the biotypes gained significantly more weight on susceptible plants than on resistant plants, and also had reduced fecundity on resistant plants. Weight lost on resistant plants was significantly less than the loss when the aphids were kept without access to food. Biotype KS-2 differed from others in its ability to take significantly more material from the resistant plants, on which it also had a greater fecundity than any of the others. The aphids, after being kept overnight without food, took some material from resistant plants in their first three hours of feeding, but lost weight later. In contrast, the fecundity of the biotypes and the amount of plant material taken were not positively related on susceptible plants, where biotypes taking in the most material reproduced the least.

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