INSTITUTE, PUSA, FOR 1919-20 



73 



in juar (Andropogon Sorghum) and maize at Pusa was less 

 than 0-5 per cent. 



The correlation between damage to cane by borers (and 

 similar agents) and climatic conditions seems to hold good 

 in the case of all varieties of cane, thick as well as thin, but 

 thin varieties show a greater immunity than thick ones. 

 This will be evident from the following figures showing the 

 percentage of damage in a few varieties of canes grown at 

 Pusa this year : — 



So far as germination was concerned, both the plots of 

 Sathi 131 were very good and ahead of the other varieties, 

 but this advantage was only maintained so long as the soil 

 retained moisture from the irrigation done at the time of 

 planting, and when overtaken by the drought these plots 

 collapsed. All the affected shoots in the experimental plot 

 of Sathi 131 were cut out on 25th April but the subsequent 

 state of infestation shows clearly that this treatment was 

 of no avail to reduce the percentage of attack. 



Thin varieties of cane also seem more resistant to 

 drought. In the first week of June the plot of Reora pre- 



* All the affected plants were cut out with pruning scissors above the level of the ground so as to 

 cause the least disturbance to the plants. 



