1900] 



PEAR. 



Pear Leaf-blister Mites. Phytoptus pyri, Nalepa. 









Phvtoptus pyri.— Female ; natural length circa 0-2 mm. ; left leg of the first 

 pair of P. trL<!tnatu>>, and (smaller figure) of P. trintrintus var. carmen, magnified 

 550 times— all after Dr. Nalepa. Infested Pear leaf. 



The harm caused by the Pear-blister or Gall Mite to Pear leafage 

 appears to be of old standing, and commonly met with ; but from the 

 reason of its presence not being generally recognized, remedies are not 

 applied as is desirable. 



The mites which cause the mischief are of the same nature as the 

 Phytoptus ribis, or Black Currant Gall Mite, with which at present we 

 have not been able to cope satisfactorily on our Black Currants. 

 Like them, they and the others of the subfamily of Phytoptida may be 

 distinguished from all others of the order Acarina, to which they 

 belong, by their cylindrical shape, and by having throughout their 

 lives unly two pairs of leys, which are placed (as shown in the enormously 



