One of the toughest resisters to scientific warfare has been the squash bug. Even he is 

 yielding to new sprays developed in the Station s study of contact insecticides 



Particular interest has focussed during recent years on the sequence 

 of studies of contact insecticides. Because of increased governmental 

 restrictions on fruits and vegetables sprayed with arsenicals, there 

 has been need for more accurate information regarding oils and other 

 types of spray materials. A new technique for determining the 

 effectiveness of such insecticides has been worked out, and was re- 

 cently termed by a famous English toxicologist one of the most fun- 

 damental contributions to the subject yet made. Ten different bulle- 

 tins dealing with various phases of the study have already been 

 published. Now the attack is being carried forward into the held of 

 insect eggs. 



Complete studies of the 

 apple maggot, running 

 over many years, have es- 

 tablished significant facts 

 about this distinctive pest, 

 including the discovery 

 that it is able to hold over 

 in the ground for two years 



415> 



