KXlM':KlMb:N rs Willi Sir.\lMl-:k \\'A.Sllb:S lOR 

 THK SAN JOSP: SCALl^. 



Jul}' 12 and L\ 1^)02, an experiment with two summer washes 

 for the San Jose scale was tried in southern Illinois by my field 

 assistant, Mr. E. S. O. Titus, the results of which were learned by 

 an inspection made Autifust 15. The insecticides used were a kero- 

 sene emulsion with whale-oil soap, containing- ten per cent, of 

 kerosene; and a mixture of soda, potash, sulphur, and whale-oil 

 soap known as the "Los Ang-eles Co. Wash No. 5." 



In the preparation of the latter three pounds of sulphur and one 

 pound each of caustic potash and caustic soda were boiled for an 

 hour in two gallons of water. At the same time a solution of 

 twenty pounds of whale-oil soap was made b}' boiling, and at the 

 end of the hour, the materials being" all dissolved, they were mixed, 

 boiled fifteen minutes long-er, and then diluted with one hundred 

 g-allons of hot water and used at once, while hot. 



Fifty-eig-ht trees infested with the San -lose scale were thor- 

 oughly sprayed with this wash, forty-nine of them apple and nine 

 of them peach. The Morrill and Morley pump was used with a 

 sing-le ^'ermorel nozzle. The weather was clear and extremely hot 

 and dry. The apple-trees were nearl\' all heavily infested. Sev- 

 eral of them were almost completely incrusted with the scales, 

 which extended out to the small limbs not more than a quarter of 

 an inch in diameter, and were plentifully distributed over the fruit. 

 The peach-trees were little infested, or not at all, and were sprayed 

 mainly to test the effect of the application on the tree. 



With a view to determining- the condition of the insects at the 

 time, 7,900 scales on ten trees were critically examined, and from 

 eig-hty-seven to ninety-nine per cent, of them were found alive, the 

 averag-e for the lot being- ninety-five per cent. 



Aug-ust 15 a g-rea: many scales on these trees were found to 

 have been killed, the larger proportioa apparently on trees slightly 

 infesteil. The vast majority were, however, still alive, and crawl- 

 ing- 3'oung- were numerous on the smaller branches, leaves, and 



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