INSECTS, FUNGI, PLANT DISEASES, ETC. 



u ; 



young insects are almost microscopic in size, being one- 

 hundredth of an inch in length, consequently not seen 

 except by the practiced eye. The mature insects, as 

 already indicated, arc very small and without some ex- 

 perience will be readily overlooked, even by good ob- 

 servers. Also, persons uninformed might easily mistake 

 other insects for this species. The most common scale 

 upon orchard trees is the 

 'scurfy bark louse' (CJiio- 

 naspis furfurus), but this 

 differs from the San Jose 

 scale in some important 

 particulars. First, the 

 scurfy scale is elongate, 

 never circular in outline; 

 lies flat upon the bark, and 

 is papery white in color; 

 second, this scale passes 

 the winter in the egg state 

 and is single brooded, 

 while, on the contrary, the 

 San Jose Scale passes the 

 winter in all stages, from 



Fig. 51 — San Jose Scale. Apple 

 branch, with scale in situ, natural 

 size. Enlarged scales above at left. 

 Howard, Div. Ent. U. S. Dept. 

 Agri. Cir. 3. 



the minute egg, just cover- 

 ed with the scale, up to 

 mature individuals."* 



Plant* Injured. — Almond, apricot, acacia, alder, cherry, 

 currant, gooseberry, hawthorn, linden, osage orange, 

 pear, peach, plum, persimmon, pecan, quince, raspberry, 

 rose, spirea, weeping willow. 



Remedies. — "(1.) In all cases of recent or slight attack 

 the affected stock should be promptly uprooted and 

 burned. No measure is so sure as this, and the danger of 

 spread is so great that this course seems fully warranted. 



♦Circular No. 42, Div. Ent., U. S. Dept. Agri. 



