M. MITRA 233 
in the laboratory, bajra is altogether immune and rice is affected very little 
The following is a summary of the results of inoculations :— 
Maize 91% Sugarcane 64% Jowar 62% 
Wheat 87% Oats bes Barley 48% 
Bajra = 0% Rice 24% 
3. Melminthosporium on Jowar (Sorghum vulgare). 
Jowar Helminthosporinm has been. collected from very few places in India 
and observed only in the Punjab (Amritsar and Lyallpur). The damage done 
by this fungus to the crop is very slight. Mcrphologically the fungus is 
identical with that on maize but it must be a cifferent strain or variety as 
indicated by the cultural characters. Besides it has been observed in Bihar 
that this fungus is common on maize but absent cn jowar, while in the Punjab 
Helminthosporium has been found on jowary and not en maize. In Bihar very 
often maize and jowar are grownasa mixed crop, and the leaves of maize are 
found to be diseased but not those of jowar. But when maize Helminthos- 
porium is cross-inoculated on jowar in the labcratery, infecticn takes place. 
All these points, together with the difference in cultural characters, indicate 
that Helminthosporium on jowar is a different strain or variety of H. turcicum 
Pass. 
This fungus has been reported from other countries!, viz., Egypt, China, 
etc., where it is not: very common or injurious to this host. 
There are also other species of Helminthosporium known en this host, 
such as H. Cookie Sacc.?, 3, H. Sorghi Schw.?,? and H. geniculatum KH. and 
T.4, and lastly H. inconspicum C. and E. which is probably the same as 
H. turcicum Pass. 
THE SYMPTOMS OF THE DISEASE. 
The fungus is found on leaves only and forms long, narrow spots of dirty 
brown or straw colour (Plate I, fig. 3). The spots are marked trom the healthy 
tissue by a reddish ring. - Generally infection takes place from the tip and 
extends downward either along the margin or along the midrib. Very often 
two or more spots are formed along the edge and these coalesce and form 
into one. Sometimes long elliptical or elongated spots are formed cn the blade 
of the leaf. If these are in large number, they unite and form one irregular 
spot. 
1 Butler, E. J. ‘‘ Fungi and Disease in Plants,’ 1918S. 
2 Saccardo. Sylloge Fungorum, vol. 1V, pp. 420 and 423. 
3 Rabenhorst. Kryptogamen Flora, vol. TX, pp. 37 and 909. 
4 Palm Bj. “‘ De Helminthosporium Ziekten,” p. 16. Dept. Landb. Nijv. en Handel., 
Meded. Lab. Plantenziekten, no. 34 (1918). Ecnige Ziekten, Waargenomen aan de tarme 
op Java. 
