Abstract
Phyllosphere and phylloplane mycoflora of healthy and potato virus X (PVX) infected plants of Lycopesicum esculentum in relation to the treatment of different concentrations of magnesium chloride has been investigated. 250 ppm MgO2 level resulted to the maximum fungal population on the leaf surface of healthy and diseased plants. 125 ppm concentration of MgO2. on the other hand favoured the maximum fungal colonization on phylloplane region in both healthy and diseased plants. In both, healthy and diseased plants, 125 ppm concentration of MgCl2 proved equally good for growth of plants and the chlorophyll content of the leaf. The variation in the leaf mycoflora in the present study seems to be governed by a number of factors operating simultaneously.