Studies on mosaic disease of soybean variety MACS-13

A. mosaic disease of soybeall (Glycine max (L.) Merrill) was ohserved on variety MACS-13 in Pune. The virus produced characteristic symptoms of vein clearing, puckering, mottling, distortion of leaves, leaf curling and stunting of plant. The virus has a limited host range in the family Leguminoseae inducing different types of systemic symptoms, whereas chlorotic local leasions were induced on Chenopodium amaranticolor and C. quinoa. The virus was transmitted by sap, seed (8 per cent) and four aphid species viz., Myzus persicae, Aphis cracciuora, Aphis glycines and Aphis gossypii. The virus has longevity in vitro 96 hours at room temperature, dilution end point between 10⁻⁴ to 10⁻⁵ and thermal inactivation point betwecn 65 to 70°C. Purified virions consist of flexotus rods of 750–769 nm in length and 15–17 nm in breadth. Studies further indicated that virus under study belonged to Potyvirus group.