360 THE MONTHLY BULLETIN". 



lumps, if the flour has been properly mixed with the cold water. This 

 can be done by washing it through a box with a window screen bottom. 



The stock paste solution so formed is used at the rate of four gallons 

 to 100 gallons of water in the spray tank. To this dilated mixture 

 may be added sublimed sulphur or a sulphur solution, or both. Sub- 

 limed sulphur may be used at the rate of 5 to 10 pounds to the 100 

 gallons. The 5-pound mixture is sufficiently strong if the spraying is 

 done properly. 



Sulphur solutions may be used at the rate of 1 to 6 pounds of sulphur 

 (in the form of poly sulfides) to the 100 gallons. A good formula for 

 both citrus and almond red spider may thus be made up : 



Water 100 gallons 



Flour paste 4 gallons 



Sublimed sulphur 5 pounds 



36-degree lime-sulphur solution 1 gallon 



Thorough agitation is necessary to keep to sulphur in uniform sus- 

 pension. Parker recommends this formula, minus the sublimed sul- 

 phur, for yellow mite on hop. Commercial lime-sulphur solution is 

 now readily obtainable. It is more convenient to use than the lye- 

 sulphur formula, so that material will not be discussed here. 



Iron Sulfide. 



Sublimed sulphur is at best a coarse material. A much finer form 

 of .sulphur is produced by precipitation of lime-sulphur solution with 

 copperas (iron sulfate). 



^^''ater 100 gallons 



Flour paste 4 gallons 



Lime-sulphur solution 5 quarts 



Copperas (iron) sulfate 2 pounds 



Add the solution of copperas to the full}- diluted mixture in the spray 

 tank, with proper agitation. 



This formula will be found very satisfactory for treating the almond 

 red spider on various deciduous trees, and may be used on oranges for 

 the August spraying, or after the fruit is picked. If applied too near 

 picking time, the fruit may be .stained. 



Sulphur Injury. 



In some cases foliage may be injured even by very dilute .sulfide 

 solutions. Peach trees have at times shown a high degree of sensi- 

 tiveness. In cases where injury developes the lime-sulphur .should be 

 much reduced in strength or eliminated entirely. In the iron sulfide 

 formula the lime-sulphur solution may be reduced to three quarts, or 

 the commercial material can be used, in which case both lime-sulphur 

 solution and copperas are omitted. Also, the sublimed sulphur form- 

 ula just given, with lime-sulphur solution omitted, wall be found satis- 

 factory. Commercial iron sulfide .should be used at the rate of 6 to 12 

 pounds to the 100 gallons. 



