Abstract
SUMMARY Feeding aphids on plants infected with carnation etched ring virus (CERV) or figwort mosaic virus (FMV) prior to feeding on plants infected with aphid non-transmissible isolates of cauliflower mosaic virus (CaMV) facilitated transmission. This indicates that CERV and FMV code for aphid transmission factors which can substitute for the defective factors in the non-transmissible CaMV isolates.
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