Association of okra (Abelmoschus esculentus (L.) Moench) yellow vein mosaic incidence with population of its vectors under Kerala conditions
Keywords:
okra, Abelmoschus esculentus, germplasm, yellow vein mosaic, vectors, whitefly, leaf hopper, Bemisia tabaci, Empoasca devastans, association, populationAbstract
One hundred and one accessions of okra (Abelmoschus esculentus (L.) Moench), collected from various parts of India, were scored for Yellow vein mosaic disease (YVM) incidence and population of two vectors of the disease during summer season during four stages of the crop. The accessions differed significantly for whitefly population during all the three stages of the crop (30, 50 and 70 DAS), while leaf hopper count showed significance only during 50 DAS. Time of infestation differed significantly for white fly at 30 DAS whereas in all other cases, time mean square was non-significant. Correlation coefficients of YVM incidence with vector population computed during different crop stages revealed that morning and evening population of both whitefly and leaf hopper (except for morning population with YVM during final harvest) at 30 DAS had significant association with disease occurrence from 50 DAS to final harvest. Besides, white fly population during both the time at 50 DAS also had influence on YVM incidence during final harvest.
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