Abstract

Experiments were conducted in the field over a period of 2 years to assess the extent of loss in soybean due to yellow mosaic which appears in high incidence at Kanpur. The inci- dence ranged from 30 to 58 per cent. Intense yellowing of the foliage, lesser branches and stunting of the plants were found to be the main contributory factors governing the reduc tion in yield. The disease caused reduction from 19 to 66 per cent in height 15,7 to 74 per cent in number of pods per plant and 26,3 to 73.2 per cent grain weight per plant in 4 disease intensita categories. The average loss recorded, however, was 18,96 and 21,52 per cent or 3.79 quis, and 4,3 quis. per hectare during 1975 and 1976 respectively.

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