356 BOARD OF AGRICULTURE. [Pub. Doc. 



The scurfy scale is found on the apple, crab-apple, pear, 

 peach, cherry, quince, Japan quince, currant, mountain ash 

 and many other plants. 



Treatment for the Oyster-shell and Scurfy Scales. 



The treatment for these two scales is comparatively 

 simple. As there is but one brood of young each year, 

 the infested trees or plants should be sprayed soon after the 

 young hatch from the egg ; this will be some time in June, 

 varying with the season. The material used for spraying 

 may be either kerosene emulsion or a mechanical mixture 

 of kerosene and water. If kerosene emulsion be used, it 

 should be prepared as follows : hard soap, shaved fine, one- 

 half pound ; water, one gallon ; kerosene, two gallons. 

 Dissolve the soap in the water, which should be boiling ; 

 then remove from the fire, and while hot pour it into the 

 kerosene. Churn this with a spray pump till it changes, 

 first into a creamy, then into a soft, butter-like mass. For 

 use, take one part of this prepared emulsion and thoroughly 

 mix with nine parts of soft water by churning it back into 

 the pail, or whatever it may be in, through the spray pump 

 until it is thoroughly mixed, then apply to the tree. This 

 treatment in ordinary seasons should be made about the 

 15th of June, and a second one ten days or two weeks 

 later. 



If the mechanical mixture be used instead, a special 

 pump, having two tanks, such as the " Kero water," should 

 be used, the pump being adjusted so as to mix five per cent 

 of the kerosene with ninety-five per cent of water. The 

 time of the treatments should be the same as when kero- 

 sene emulsion is used. 



The San Jose Scale. 



(Asjndiotus perniciosas Comst.) 

 This most serious of scale insects was first discovered in 

 this country in California, about 1870. It is probable that 

 Japan is its native home, as it has several times been re- 

 ceived from there on imported stock. In 1893 it appeared 

 in Virginia, where it seems to have been received from New 



