Insects, etc., Injurious to the Pear. 



353 



A dressing of kainit spread around the trees before the buds 

 open had very satisfactory results (1). Moulton (3) says sprays are 

 not successful as the thrips in the blossoms, etc., cannot be reached, 

 and suggests careful spring cultivation. 



The effect of tobacco wash on thrips is very marked and appears 

 to be not only curative but preventive for many days after application. 



REFERENCES. 



(1) Carpenter, G. H. Report on Injurious Insects observed in Ireland during 



the year 1900 (1901). 



(2) Carpenter, G. H. Idem for 1901, p. 153 (1902). 



(3) Moulton, D. The Pear Thrips. Bull. 68, pt. I., U.S. Dept. Agri. Bur. Ent. 



(1907). 



THE PEAR LEAF BLISTER MITE. 



(Eriophyes pijri. Nalepa.) 



This gall mite is common in many European countries and has- 

 been spread by means of nursery stock to Canada and the United 

 States of America, the Cape and 

 Australia. 



The disease affects the pear and 

 apple, and unfortunately has been very 

 much on the increase in recent years 

 in this country. 



Ten years ago, although well known 

 (1 and 2), it was not considered very 

 harmful, as it spread so slowly. During 

 the last two years it has taken to spread 

 with great virulence. It has been re- 

 ported from very many places in Kent 

 and Surrey, and I have also seen it at 

 work in Devon, Worcester and Hun- 

 tingdonshire. It has only once been 

 sent me on the apple in this country, 

 but in America it is quite common on 

 that fruit. 



The disease has become more serious 

 recently because ifc has attacked the 

 fruitlets as well as the leaves (3). The 

 disease manifests itself as small blister- 

 like patches on the young leaves. At first the little pustules are red, 

 then green or pallid yellow, later, as the leaves get older, they become 



2 A 



[F. Edemlen. 



FIG. 232. PEAR LEAF ATTACKED BY MITE 

 (Eriophyes 2 ) V>'>)- 



