REPORT OF state; ENTOMOIvOGIST. 



207 



Fig. 15. Aspidiotus perniciosus; adult female San Jose 

 scale, before development of eggs; a, ventral view, 

 showing very long sucking sel*. (Howard and 

 Marlatt. Bulletin 62, Uiv. of Entomology, U. S. Dept. 

 of Agri. 



Four or five generations were recognized at Washington. In 

 summing up the progeny of a single female from spring to fall 

 the number of individuals amounts to from 1,500,000,000 to ovei 

 3,000,000,000. The females are continuously producing young 

 from the middle of ^lay to early frost so that the young may 

 be found running over the trees at almost any time during the 

 summer. For this reason it is very difficult to handle them, in 

 fact almost an impossibility. The only sure way is to have all 

 nursery stock subjected to the hydrocyanic acid gas treatment 

 Tbefore being set. 



Apple-Tree Bark-Louse. 



(Lepidosaphes uliiii.) 



A brief description of this our most common scale may not 

 "be out of place when we consider that hardly a farmer with a 

 balf-dozen trees or an orchardist with his acres, with all that 

 "has been written on the subject, takes the pains to try to 

 g-et rid of this easily handled orchard pest. It is a well 

 known fact that this insect destroys many thousands of trees in 

 rthe state. Its life history is known to only a comparative few, 

 for the simple reason that the majority do not take the pains to 

 'even read the Hterature on the subject. I have so many speci- 



