SURVEY AND ESTIMATION OF YIELD LOSS DUE TO STEM NECROSIS VIRUS OF POTATO GROWING AREAS OF SOUTH-EASTERN RAJASTHAN

Abstract

Stem necrosis disease seemed as dim brunet necrotic parts at the nodes and caused girdling of the petiole foremost to leak dropping and necrosis. Stem necrosis disease ranged from 8.5 to 22.5 per cent was recorded in Kota, Baran and Bundi districts of Rajasthan. Significantly tuber yield reduction was recorded at grade wise. Maximum yield reductions (63.16%) were observed under more than 75% disease severity in Southern Eastern Rajasthan.