In.'^ecls, etc., Injurious to the Pear. 



353 



A dressing (.if kainit spread around the trees befure the Ijiids 

 (i[ien had very satisfaetury results (1). Moulton (?>) says sprays are 

 not successful as the thrips in the hlossoms, etc., cannot lie I'eached, 

 and suggests careful spring cultivation. 



Tlie effect of tobacco wash on thrips is very maihed and appears 

 1(1 be nut only curati\'e but pre\'entive for many days after applicatinn. 



li.EFERKNCKS. 



(1) C<ii-j:riif,:i\ G. H. Iicport on Injurious Insects obscrvcil in Ireland durin,;;- 



the year 1900 llOOll. 

 [■>) C,(r2'riitrr. (i. H. I.lni, for 1901. p. 153 (1902l. 

 (?.| M.uiltou. 1). Tlio Tear Tlnips. Bull. 68, pt. I.. U.S. Dept. Agri. IJur. Fait. 



(1907). 



THE PEAR LEAF BLISTER MITE. 



(7iV/'ry )////« ;'//'''• Xalepa.) 



This gall mite is common iu many European countries and lias 

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

 States of America, the (Jape and 

 Australia. 



The disease affects the pear and 

 apple, and uuh.irtunately has been very 

 much on the increase in recent years 

 in tins country. 



Ten years ago, altlniugh 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 l>een re- 

 ported from very numy places in Kent 

 and Surrey, and I have also seen it at 

 worl^ in Devon, Worcester and Hun- 

 tingdonshire. It has only once been 

 sent me on the appile in this country, 

 but in America, it is quite common on 

 that fruit. 



Tlie disease has become more serious 

 recently because it lias 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, tliey liecome 



|/.'. J-:.l,'iifle,l. 



232. — rE.Vi; l.K.VF ATT.Vei^KIt IJY MITE 

 (Krif'iihue" pari). 



