MONTANA EXPERIMENT STATION. 



163 



The bodies of this form are covered by a white flocculent matter, and 

 when several of the insects are huddled together as is usually the 

 case with this louse, the white blotches become conspicous objects. 

 The insects' most natural means of wide dissemination is on the 

 roots of apple trees intended for planting. 



Fig. 12. Woolly aphis: a, agram.ic female; b. larval louse; c, pupa; d, wlng- 

 ■ed female with antenna enlarged above; all greatly enlarged and with waxy 

 excretion removed. (Marlatt, Circular 20, Sec. Series, Div. of Entomology, 

 '¥. S. Dept. of Agr.) 



THE SAN JOSE SCALE. 



The San Jose scale is an oriental insect but it was first noticed in 

 literature from the town in California from which it took its name. 

 It is now of world wide distribution and has been the cause of much 

 loss and expense. Of small size and insignificant appearance but 

 very tenacious of life and endowed with great powers of multiplica- 

 tion, it has been an enormous factor in the fruit growing and nur- 

 sery businesses. 



The San Jose scale is a general feeder, attacking nearly every 

 variety of decidous fruit trees. In the east it has done its prin- 

 cipal damage to peach and pear but its full list of food plants includ- 

 es many ornamental plants and shade trees. 



It passes the winter as a partly grown female. In t'lo spring 

 y©ung are produced which wander off and finding suitable pWces on 



