Management of chilli leaf and stem necrosis caused by tomato spotted wilt virus
2000
Upadhyay, S. (Assam Agricultural University, Jorhat (India). Department of Plant Pathology)
Severe leaf and stem necrosis caused by Tomato spotted wilt virus (TSWV) is an emerging problem for chilli (Capsicum annuum L.) in Assam. A native chilli variety Krishna P was resistant to TSWV under natural infection. This resistant reaction of Krishna P was verified by employing tests with transmission of virus using sap and thrips (Scirtothrips dorsalis Hood). The variety, Krishna P did not show any sign of the disease. This led to the conclusion that the above variety was resistant to TSWV. The susceptible check LCA 305 developed numerous local lesions on leaves. An integrated management of the disease was tested employing non-chemical method viz. mulching with spent mushroom beds and yellow polyethylene sheets. Chemical control treatments were carbofuran in seed bed, quinalphos, bioneem and malathion as spraying in the main field. Quinalphos could delay the onset of the disease upto 80 days after transplanting as compared to 30 days in control plots. Quinalphos gave significantly higher yield (120.76 q ha-1) and the lowest (20.33%) disease incidence. The two mulches viz. spent mushroom beds and yellow polythene could not reduce the disease when compared to chemical treatments. The maximum incidence of 77.03 per cent disease was seen in untreated check plots.
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