22 



plications are best and any of the winter washes recommended for the 

 pernicious scale will answer. The covering is thicker than that of 

 the scurfy scale; but is not so resistant as that of the other species 

 here mentioned. As the insects pass the winter in all stages, one 

 application may not be sufficient, and it will be better to make another 

 toward the latter part of May, when those forms that were in 'the 

 egg stage and most probably escaped will be in a condition to be 

 reached by insecticides. 



THE SAN JOS£ OR PERNICIOUS SCALE. 



Aspidiotus perniciosus, Comst. 



This differs from our other cominon armored scales by its round 

 form and small size. In size it is as a small pinhead; in shape not 

 very different. In color it ranges from gray to black, the larger 



-^^^^3»cQ[y 



rig. 12. 



The San JoBe scale : o, the new-born larva ; 6, Its antenna ; c, the adult female, taken from beneath 



the scale ; d, the edge of the anal plate ; all very much enlar^d. 



From Dlv. Ent., 17. S. Dept. Agl. 



scales being usually gray, with a yellowish center. This yellowish 

 center distinguishes the pernicious scale from some other forms that 

 occur sparingly on shade and fruit trees. In its younger stages the 

 scale is entirely black. 



