-27- 



the bark as to form a scaly crust, which can be rubbed off 

 with the finger, It attacks nearly all varieties of fruit 

 trees and is perhaps the only insect that is not controlled 

 to any extent by clean culture and thorough tillage. The 

 female insects deposit their young as early hatched larvae, 

 which resemble tiny, yellow mites except that they have legs 

 and atennae of true insects. They wander about for a few 

 hours and then insert their sucking mouth parts into the 

 bark and soon secrete over their backs a scaly covering. 

 There are at least four generations each season, and it has 

 been calculated that one pair of San Jose scale insects 

 could give rise to over three billion descendants in a sin- 

 gle season, if all lived out their lives without accident. 



Control: This pest can be controlled on orchard trees 

 by thoroughly spraying with lime-sulphur wash, diluted to 

 4" degrees Beaurae, either in the fall, after the leaves 

 are mostly off the trees, or in the spring from the time 

 when the buds begin to swell until the flowers commence 

 opening. 



Round-headed Apfile Tree Bo rer. The Api-^le tree borer 

 is a dangerous insect enemy of the apple since it attacks 

 perfectly healthy trees and its work is so concealed as to 

 escape notice until the trees are past relief. 



The borers are the larval stage of a long-homed beetle 

 with two »hite stripes extending from the head the whole 

 length of the body. The females lay their eggs during the 

 warm season in small slits which they make in the bark. The 

 b o rera «te*»te tot*a from these eggs tunnel in the inner bark 



