Report of State Board of Horticulture. 71 



FOR SAN JOSE SCALE, GREEDY SCALE, AND TURTLE-BACK SCALE. 



Sulphur, lime, and salt in the fall as soon as the leaves have 

 dropped, and again in the spring before the buds begin to 

 swell. 



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. 

 {Phytoptus 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 noticeable. The Phytoptus pyri is a micro- 

 scopic gall mite. It can not be seen with the naked eye, ex- 

 cept 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 jDear, 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 becoming dry and falling. The mite is 

 supposed to desert the leaves after they have fallen, and seek 

 w^inter 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 

 pow^dered sulphur, but it can not 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 sul- 

 phur on the affected trees. 



Remedy — Sulphur, lime, and salt before the buds swell, fol- 

 lowed by dusting with sulphur when leaves have formed. 



