50 Report of State Board of Horticulture. 



for green aphis. 



First application with sulphur, lime, and salt in the fall after 

 leaves have dropped, followed in the spring with tobacco wash, 

 as they appear on the trees. 



FOR PEAR-LEAF BLISTER MITE. 



{PhytopUis Pyri.) 



Until recently the rough, brown-looking spots seen on the pear 

 trees were passed by as being the fungus that attacks the pear so 

 generally here, but upon closer examination it was found that these 

 spots are the work of this mite. In some localities this pest has 

 gained a strong foothold, and in others it is as yet hardly notice- 

 able. The phyfoptus pyri is a microscopic gall mite. It cannot be 

 seen with the naked eye, except on a piece of clear glass held up 

 to the light, when it appears as a minute speck. It is not nearly as 

 long as the width of a hair. It is found only on the pear, the leaves 

 of which are exclusively its home. It burrows into the pulp of the 

 leaves, making a cave in which it lives and multiplies. A colony 

 will work out an excavation, which becomes a slight puff or dark- 

 colored gall on the leaf, from a speck to an eighth of an inch in 

 size. The mite keeps open a hole on the under side of the leaf for 

 a doorway. The injury to the tree is caused by the leaves becom- 

 ing dry and falling. The mite is supposed to desert the leaves after 

 they have fallen, and seek winter quarters upon the tree. It would 

 be a good plan to burn all fallen leaves from affected trees and 

 spray the trees with sulphur, lime, and salt solution as soon as the 

 leaves have dropped. In the summer the mite can be destroyed 

 with powdered sulphur, but it cannot be expected to rid the tree 

 entirely of the mite by this means, as there are eggs and young in 

 the caves, which the sulphur does not affect. In California they use 

 a seeder on a wagon for throwing the sulphur on the affected trees. 



7?<?mecZi/— Sulphur, lime, and salt before the buds swell, followed 

 by dusting with sulphur when leaves have formed. 



FOR TWIG BORER AND BUD MOTH. 



Spray in the fall, as soon as all the leaves have dropped, with 

 sulphur, lime, and salt solution, followed up in the spring, as soon 

 as the buds begin to swell, with the following wash: Sulphate of 



