110 DECIDUOUS FEUIT INSECTS AND INSECTICIDES. 



the buds have advanced so far as to have the green tips exposed. 

 If the above precautions are carefully followed in applying the mis- 

 cible oil, danger of injury to trees will be reduced to the minimum. 



There are a number of good commercial brands of miscible oil on 

 the market. These miscible or soluble oils are so made that they 

 mix readily with water. The material may be applied either by hand 

 pump or gasoline-power sprayers. Power outfits are to be preferred. 

 Nevertheless, whichever kind of outfit is employed, it is essential 

 that it be provided with a good working agitator. To do effective 

 work it is also necessary to have sufficiently long spray rods and leads 

 of hose. Nozzles with medium-sized holes or apertures are recom- 

 mended. 



Miscible oils at the strength recommended for the destruction of 

 the eggs of the fruit-tree leaf-roller are valuable in controlling scale 

 insects such as the San Jose scale (Aspidiotus perniciosus Comst.), 

 Howard scale (Aspidiotus Tiowardi Ckll.), etc. Orchards sprayed 

 with the oil for the leaf-rollers will not require the usual application 

 of lime-sulphur for the San Jose or Howard scales. 



In conjunction with the oil treatment in badly infested districts it 

 is recommended that a very thorough application of arsenate of lead, 

 at the rate of 3 pounds to 50 gallons of water, be applied when the 

 larvae are emerging from the eggs. The larvae will be found to be 

 hatching just as the cluster buds on early-blooming varieties of 

 apple are beginning to separate. The necessity for making this 

 application will depend largely upon the thoroughness with which 

 the miscible oil was applied. 



ADDITIONAL COPIES of this publication 

 -£*- may be procured from the Superintend- 

 ent of Documents, Government Printing 

 Office, Washington, D. C, at 10 cents per copy 



