INVESTIGATION ON THE TRANSMISSION EFFICIENCY OF CUCUMBER MOSAIC VIRUS BY TWO BIOTYPES OF APHIS SPIRAECOLA ON CUCUMEROPSIS MANNII IN CALABAR
Abstract
ABSTRACT
The transmission efficiency of two biotypes of Aphis spiraecola involving Cucumber mosaic virus was studied in the university screenhouse. Aphid number per plant was the parameter adopted to measure the transmission efficiency of the virus. The experimental design for the study was 1 × 2 × 4 factorial arranged in a complete randomized design with four levels of treatments and three replications. The results showed that when a single aphid biotype I was used per plant, a 40% transmission efficiency was achieved. When the number of aphids per plant were increased to 3, 5 and 7, the percentage increased 60%, 100% and 80% respectively. When the same test was carried out with aphid biotype II for 1, 3, 5 and 7, the transmission efficiency was 40%, 80%, 100% and 80% respectively. When the means of aphid biotypes I and II were separated, there were no significant differences in aphid number 1, 5 and 7. There was however a significance difference when aphid number 3 was used in the transmission experiment.
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