APPLE INSECTS 



31 



are inserted in the bark where the embryo develops some 

 distance from the surfaces ; the latter are relatively few and 



oeciir when the; trees 



are in full foliage, 



when it would Ix^ 



very difficult to hit 

 them. Attempts to 

 destroy the young 

 nyinphs by spraying 

 with kerosene emul- 

 sion or whale-oil soap 

 have not l)een suc- 

 cessful, l)ut fairly 

 good results have 

 been obtained by the 

 use of ''Black Leaf 40" tobacco extract, one pint in 100 gallons 

 of water, applied very thoroughly just before the blossoms open. 

 Sometimes a second apphcation, just after the falling of the 

 petals, may be found necessary. " Black Leaf 40 " can be 

 used with the lime-sulfur as used for a summer spray. When 

 used wuth water add 4 to 5 pounds of soap to make the mixture 

 stick and spread better. The spraying should be done on bright 

 warm days, for in cool weather many of the nymphs hide away 

 in the opening leaves. 



Reference 

 Cornell Agr. Exp. Sta. Bull. 29L lOU. 



P'iG. 31. — ■ H. ma 

 linus, adult (X 3|). 



Fi( 



. 32. — L. mendax, 

 adult (X3|). 



The Apple Maggot 



Rhagoletis pomonella Walsh 



This native American insect, although originally feeding in 

 the fruit of the w41d thorn, has during the past sixty years be- 

 come a serious enemy of the apple in the Eastern states and 



