Abstract
Cucurbit crops are economically important crops for small land holders and family farmers. Cucurbit crops are grown worldwide as a rich source of nutrients in the human diet. The FAO estimates that cucurbits in India are grown on about 4,290,000 ha, with a productivity of 10.52 t/ha. The production of cucurbits is significantly threatened by plant viruses that affect plant growth and fruits. More than 90 viruses can infect cucurbits, and approximately 15 of them belong to the genus Potyvirus, family Potyviridae. The most prevalent potyviruses that threaten cucurbit production worldwide include papaya ring spot virus (PRSV-W), watermelon mosaic virus (WMV), and zucchini yellow mosaic virus (ZYMV). The symptoms of potyvirus disease in cucurbits include mosaicking, yellowing, shoestring leaves, stunting, and fruit and seed deformation. Potyviruses can be transmitted by several different modes, including vegetative propagation of infected plant material, by vectors such as aphids, through seed from infected plants, and by contact of infective sap with wounded leaves. Plant virus-resistant or -tolerant varieties, aphid control, and on-farm biosecurity are only effective ways of potyvirus management.
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