BIOLOGICAL STUDIES OF APHIS RUM WIS LINN. REPRODUCTION ON VARIETIES OF VICIA FABA.

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Abstract
SUMMARY.: The reproduction of Aphis rumicis was tested on 18 varieties of field beans and the results compared with the reproduction on Prolific Longpod broad beans.The aphids used in the experiments were the offspring from one Fundatrix.The experiments were all carried out under similar conditions. Five plants of each variety were tested, and the total number of aphids produced on each plant, from one a. v. ♀, in 14 days was counted.The mean values of infestation for the varieties range from 37 to 1037, vide Tables I and II.These mean values allow of the varieties being grouped into classes representing various grades of susceptibility, ranging from 98 per cent. to 3 per cent, vide Table III. Vicia narbonensis has a very low susceptibility. The results obtained indicate that resistance or susceptibility may be largely determined by genetic factors in the plant.

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