The Bulletix. 



9 



recognized by the average farmer until the trees begin to die, and 

 by that time much injury has already been done. It is, therefore, 

 very important to know what the insect is like, and where to look for 

 it, so that the grower may be enabled to detect it before it has already 

 become destructive. 



Trees thai are very badly infested with the San Jose Scale appear 

 as if the branches had been dusted with ashes, having a grayisli^ 

 scurfy appearance. If these branches and twigs be scraped with a 

 knife it will be found that this unnatural covering is quite easily 

 removed, coming off in little flaky patches. The appearance of a 

 portion of such a branch is sho^Am in Fig. 2, as it appears to the naked 

 eye. (We regTct that this illustration is not clearer, but it is very 

 •difficult to get a satisfactory illustration of this kind.) Examined 

 under a magnifying-glass a thickly-infested twig (during the season 

 when the insects are breeding) will likely present the appear- 

 ance shown at b in Fig, 3. Each of the circular gray objects is 

 a separate scale, each covering a tiny yellow insect underneath. 





^! 





Fig. 2. — Portion of branch thickly 

 Infested with San Jose Scale, as seen 

 with naked eye. (After W. E. Britton). 



L„j 



CL 



Fig. 3.— a, infested twig natural size ; 6. portion of branch 

 thickly infested as seen with magnifying-glass. (After Howard 

 and Marlatt, U. S. Dept. Agr.). 



