83 



the data of a spraying experiment in an orchard of Kome 

 apple trees, with some interplan tings of other varieties. 



Table 1. Summary of Experiments Against the Rosy Aphis 



Number and Variety Treatment Centers of Fruits Leaves 



of Trees Infestation Injured Curled 



Average per sprayed Rome 2.55 1.83 9.55 



Average for all sprayed trees 1.93 1.17 7.17 



Average per unsprayed Rome 45.57 39.85 189 



Results similar to the foregoing have been obtained in 

 Other experiments. In years when the rosy aphis is super- 

 abundant it may perhaps be necessary to make a supple- 

 inentary treatment cither before or after blossoming. As to 

 its value, and when it should be made, if needed, are 

 questions on which we are concentrating our attention. 

 Aside from the protection given to the trees from the rosy 

 aphis, thorough spraying of the opening buds with lime- 

 sulphur and nicotine solution, or soap combined with nico- 

 tine solution, will completely destroy an associated species 

 — the oat aphis. 



This tieatment also affords temporary relief from the 

 green apple-aphis. Owing to the fact that the latter species 

 lives on the apple the entire year several applications of a 

 contact spray at intervals of three or four weeks during the 

 growing season have usually been required in order to keep 

 this aphis under control. 



INSECTS THAT FACTOR IN THE GRADING 

 OF APPLES 



The New York Apple Grading and Branding Law speci- 

 lies among other things that the "Fancy" grade shall be 

 free from insect and fungous injuries. A tolerance of five 

 percentum below certain specifications on a combination of 

 all defects or two percentum on any single defect is allowed. 



