Abstract
Aphid transmission tests from the epidermis and exposed subepidermal tissues were conducted for five consecutive weeks after inoculation of the virus source plants with cucumber mosaic virus. The transmission rates from the subepidermal tissues (corrected for effects of exposure) were not significantly different from those of the epidermis. The hypothesis that transmission rates after brief feedings (epidermis) are generally higher than after prolonged feedings (during which aphid stylets penetrate into the subepidermal tissues), because of unequal distribution of virus in the tissues would not be consistent with the results obtained in this experiment.
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