Abstract
Bhendi Yellow Vein Mosaic Virus (BYVMV) incidence caused by white fly is the main bottleneck for cultivation of the okra. The present investigation was carried out in three major okra-growing districts of Tamil Nadu viz., Coimbatore, Dharmapuri and Dindugul on whitefly incidence and occurence. A field survey on these districts revealed that the mean whitefly population of 1.82 per plant was observed while the incidence of BYVMV in the Coimbatore district was 13 per cent. The least mean population was observed in the Dharmapuri district with a mean of 0.48 whiteflies per plant and BYVMV incidence of 15.75 %. In order to gain insight into whitefly genotypes occurring on Okra (Abelmoschus esculentus L. (Moench), whitefly samples were collected from 8 locations of Tamil Nadu, and their mitochondrial cytochrome oxidase subunit I (mtCOI) gene was molecularly characterized for species identification. sequences results revealed that the whitefly belongs to Asia I genotype. Thus, the present study confirmed the presence of Asia 1 genotype in B. tabaci throughout Tamil Nadu okra growing regions.
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