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THE SUITABILITY OF SOME CROPS TO INFESTATION BY THE WHEAT APHID, SCHIZAPHIS GRAMINUM (HOMOPTERA: APHIDIDAE)

The suitability of some crop cultivars, planted in the Orange Free State province of South Africa, as hosts for the wheat aphid, Schizaphis graminum (Rond.), was examined in the laboratory by giving aphids tethered flight and releasing them on individual plants. Comparisons made between wheat, oats and rye and between differently aged wheat foliage, showed that wheat was more readily infested by “alighting” aphids than either oats or rye, on which subsequent longevity was moreover adversely affected, and that mature wheat was just as readily infested as young wheat.