Species and Variety Differences in Resistance to Aphid Injury in Vetch12

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Abstract
Infestations of the pea aphid, Illinoia pisi Kalt., which have occurred frequently on the winter legume plots at Auburn, have brought to light striking varietal differences in the resistance of vetches to aphid injury. Recovery from such attacks resulted if the infestations occurred during the warm periods of midwinter or early spring; but when they occurred in late May, which was more common, they served to hasten the maturity of the crop. Observations indicated that these late infestations might have been responsible in a measure for reductions in seed yields. Low seed yields, along with the high cost of seed produced elsewhere, have been the principal obstacles to the progress of the winter legume program in Alabama.

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