Insects, etc., Injurious to the Plum. 



399 



first-named is in the form of small pale wart-like blisters on the 

 upper surface of the leaves of plums, which are hollow beneath, the 

 colour above may sometimes be reddish and the galled areas may 

 become slightly hairy. 



The second I have usually found on the damson and bullace, and 

 also on the wild sloe ; the galls are situated at the edges of the leaves, 

 which become swollen in attenuated patches. 



IF. Edenden. 



FIG. 267. PLUM LKAVKS ATTAI RK1) BY GALL MITES. 



Sometimes they occur in sufficient numbers to seriously harm 

 the foliage. 



The minute mites are with difficulty found in the galls, owing 

 to their small size and transparent nature. 



They leave the galls when the foliage ripens and enter the buds, 

 where they pass the winter just under the scales. Eeproduction 

 takes place in the galled areas. A considerable amount of the first 

 is seen in parts of the Midlands, and the latter is quite common in 

 Kent on damsons and bullace. The last-named I have found may 

 be checked by spraying in winter with lime, salt, caustic soda and 

 sulphur wash (vide appendix. Washes). 



I have frequently noticed that when the plum or pear buds are 

 full of the hibernating Eriopliyidcc that Tits and Sparrows are 



