22 STATE HORTICULTURAL COMMISSION. 



with dew in the morning, thoroughly dust them with sulphur. 

 Use sulphur bellows, or if the orchard is extensive, fix up a 

 broadcast seeder on a wagon. With this arrangement an 

 orchard can be treated very thoroughly and with dispatch. 

 Infested orchards should be treated at least three times during 

 the spring and early summer. 

 ' While this is true generally, sometimes the dry sulphur does 



FIG. 21. Yellow Mite. FIG. 22. Pear-Leaf Blister Mite (Phytoptuspyri), very 



greatly enlarged. 



not seem to do the work, owing to climatic conditions, and it is 

 best to apply the sulphide of potash wash, as follows: 



Caustic soda 98% 10 pounds. 



Sulphur. __ 20pounds. 



Dissolve in water 20 gallons. 



Take the sulphur, mix it to a paste not sloppy with cold 

 water in a barrel, then add to this wet sulphur 10 pounds of 

 caustic soda (98 per cent), and it will boil the sulphur just like 

 lime slaking; have 20 gallons of water to add to it as it boils, 

 to prevent its burning. This is the stock solution, and when 

 ready to spray the mites or spiders, put 40 gallons of water in 

 another barrel, and take a half gallon of the stock solution 

 and add to the 40 gallons of water, straining it to take out any 

 sediment there may have been in the sulphur. Remember, 

 this is for mites and spiders only. This stock solution should 

 be diluted one-half gallon to 40 gallons of water, and applied 

 with a spray pump under 100 pounds pressure. 



The distillate spray of 2 per cent strength with the addition 

 of 7 pounds of flour of sulphur has proved very effective in 

 some sections of the State. To use the sulphur in this mixture, 

 it is necessary to first make a paste of the sulphur before adding 

 it to the distillate mixture. 



For Pear-leaf Blister Mite, Walnut-leaf Blister Mite, Grape-leaf 

 Mite, Orange and Lemon Peel Mites. The burrowing mites, or 

 Phytopti, differ from all the other mites in having but two 



