INSTITUTE, PUSA, FOR 1916-17 75 



In the second week of May the plot of Purple Mauritius 

 planted in November was damaged to the extent of 8-9 per 

 cent. — 



Papua depressella being responsible for about 5-8 per 



cent. 



Red Rot being responsible for about 1-1 per cent. 



Termites being responsible for about 0-8 per cent. 



Diatroea suppressalis being responsible for about 0-66 

 per cent. 



Scirpophaga scant ho gastrella being responsible for 



about 0-52 per cent. 



There was one shoot damaged by Gryllotalpa africana and 

 two shoots damaged apparently by Red Ants. At this 

 time there was no difference noticeable in the growth of the 

 plants. 



In the third week of May the plot of Purple Mauritius 

 planted in February was damaged to the extent of about 

 11-5 per cent., the following being responsible for the dam- 

 age : 



Papua depressella about 8-1 per cent. 

 Red Rot about 2-27 per cent. 

 Diatroea suppressalis about 0-7 per cent 

 Termites about 041 per cent. 



Scirpophaga ocantho gastrella about 0-06 per cent. 

 There was one shoot apparently damaged by Red Ants. 



All the affected plants were cut out and destroyed with 

 the insects in both the plots. 



About this time (i.e., second and third weeks of May) all 

 the other plots of sugarcane were also examined to note the 

 extent of damage, though the affected plants were neither 

 cut out nor critically examined to find out the agent of 

 damage as was done with the Purple Mauritius plants. 

 The damage was however similar in all external appear- 

 ances and the agents would most probably be the same as 

 observed in the case of the Purple Mauritius. 



The damage in Sathi No. 131 was 7-5 per cent. 



The damage in Sathi No. 15 was 9-6 per cent. 



