86 



THE EEPOET OP THE 



No. 36 



Blaek-Leaf-40 was used alone with water in the proportions of one part of 

 the solution to 1,066, 800, 400 and 250 parts of water respectively, but in no case 

 was it at all satisfactory as it only killed a small proportion of the nymphs, even of 

 the small ones. At first we thought that this spray would kill at 1 to 800 both by 

 eontact and by the fumes, but experiments showed that the nymphs were not 

 dead but only stupefied and that they soon revived and appeared to be none the 

 worse for the treatment. 



Severe case of injury due to feed- 

 ing of both adults and nymphs 

 of Neurocolpus ntcbilus upon 

 suckers at the base of the apple 

 trees. (Natural size.) 



The Black-Leaf -40, however, when used with soap — 1 part of the solution to 

 800 parts of water, with 4 lbs. Sunlight Soap per 100 gals, of mixture — produced 

 a spray which killed 96 per cent, of nymphs of all sizes, most of them being large. 

 The tree was, of course, thoroughly covered with the mixture. Soap alone gave 

 almost as good results but, owing to scarcity of nymphs at tlie time it was tried, 

 was not given so many or quite so good tests. The results, however, were very 

 gratifying. The efficiency of the soap spray was seen to depend chiefly upon its 



