KULKARNI. 



269 



infection of other plants in the field has not been 

 observed. In order to verify this, 15 inoculations were 

 made on plants not more than 20 days old. In each 

 experiment the moving zoospores were transferred 

 to healthy plants on both surfaces of the leaves and the 

 plant was covered with a bell- jar. But there was no 

 infection in any plant. Besides, in the fields it was 

 observed that the plants in the neighbourhood of the 

 affected one did not take disease, although the leaves 

 of the healthy and the affected were touching each 

 other. 



(2) The sporangial stage does not stop after the oospores have 



commenced to form. It can be found even at the time 

 when the plant is completely mature, along with the 

 oospore state. 



(3) Although the malformation of heads occurs only in the 



plants which are affected from the beginning, it is not 

 uncommon to find plants otherwise apparently healthy 

 producing deformed heads. In other cases a deformed 

 axillary bud is the only sign of disease. 



JoWAR SCLEROSPORA. 



The disease manifests itself on this host in three different 

 ways : 



1st form :— Here the attack is just like that on bajri plants. 

 The disease is found on the plant at a very early stage, just after 

 it comes up from the soil. The leaves of the attacked plants are 

 pale yellow in colour, the paleness extending from the base 

 towards the tip, and they are narrow compared to those of healthy 

 plants. Conidiophores and conidia are on both surfaces of the 

 leaves but more abundantly on the lower surface. After five or six 

 weeks, white streaks appear on the top leaves, indicating the 

 beginning of oospore formation, and soon after leaf-shredding appears. 

 The shredding usually begins from the margin towards the midrib 

 from both sides of the leaf and, when complete, only the midrib 



