ORCHARD INSECTS OF THE PACIFIC NORTHWEST 



61 



CONTROL 



The injury caused by the snowy tree cricket may very largely be 

 prevented by poisoning the crickets while they are still feeding on 

 the leaves and before they have begun to eat holes in the fruit. In 

 southern Idaho this may be done between 

 July 15 and August 1. The trees may be 

 sprayed with lead arsenate, 2 pounds to 

 100 gallons of water, to which is added 

 1 pound of casein spreader. Or they may 

 be dusted with calcium arsenate, using 

 about 1 pound to eight trees. 



Syneta Leaf Beetle 



The Syneta leaf beetle (Syneta albida 

 Lee.) ordinarily does not injure prunes so 

 severely as it injures pears and cherries 

 (pp. 39 and 49). Most of the primes 

 grown in the area inhabited by the beetle 

 are sold in the dried form and the smaller 

 injuries are of less consequence than those 

 on fruit that is to be marketed green or 

 fresh. The injuries result in russeted areas 

 on the prunes. These areas, when large, 

 detract from the appearance of the dried Figure 68. — Snowy tree 

 product (fig. 69) and make the fresh fruit cncket ' female ' > 2 ' and 





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frf% 



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unmarketable. 



section of twig, showing 

 egg. 



CONTROL 



Lead arsenate, 3 or 4 pounds to 100 gallons, should be used for 

 controlling the beetle on prunes. It is most effective if used just 

 before and just after the blooming period, and it may be added to 



Figure 69. — Dried prunes: A, russeted by syneta leaf beetle; B, uninjured. 



