AND COLLEGE, PUSA, FOR 1915-16 63 



part of the hot weather (April-May), causing greater 

 damage than either Diatrcea or Scirpophaga. The external 

 symptom of attack is " dead-heart " as is the case of boring 

 by Diatrcea, Scirpophaga and Sesamia. 



A series of experiments was carried out on the protec- 

 tion of cane setts from attack of termites, the following 

 substances being tried, viz. — Lead Arsenate, Resin Conv 

 pound, Fish-oil Soap with Resin, Crude Oil Emulsion, and 

 Naphthaline Emulsion. Of these Lead Arsenate proved to 

 be the best. In this connection it may be observed that it is 

 not only the setts themselves which require protection but 

 also the new shoots — in fact, in most cases the shoots are 

 most attacked, being eaten into at the point of exit from the 

 sett. It is of course much more difficult to protect these 

 shoots than the setts and, to achieve this, additional treat- 

 ment is usually necessary. Further experiments will be 

 Tinder taken on this line next season. 



4. Indigo. During the year two Indigo Pests (Indigo 

 Aphid and Dichomeris ianthes) were reported from two 

 factories, Barh Chakia and Tateriah, both in North Bihar. 

 A Fieldman was sent to spray the infested fields with Soap 

 Solution. Two sprayings were given and the effect was 

 reported to be good by the Managers of the factories con- 

 cerned. 



5. Coffee. The year 1915 was marked by a very bad 

 outbreak of Coffee Borer {Xylotrechus quadripes) in Coorg. 

 One group of estates in S. Coorg, of about 500 acres, 

 removed approximately 100,000 bored bushes between 1st 

 June and 31st October 1915. The Imperial Entomologist 

 toured in Coorg in October and November to investigate 

 this insect. The beetles began to emerge in the last week of 

 October and were common by the first week of November. 

 Eggs were obtained and hatched out and it was proved that 

 .sunshine is not essential to the hatching of the eggs, as 

 stated by former observers. The eggs, which are white, 

 soft, of rather indeterminate shape rather like minute rice- 

 grains, are thrust singly or in little groups (of about 6-8) 



