446 Diseases of Econornic Plants 



5 to 15 minutes, according to whether the Hme is quick-acting 

 or sluggish, are required for the process. At the end of 30 

 or 40 minutes, if the hot mass is permitted to stand undiluted 

 as a thick paste, a liquid is produced that is dangerous to 

 peach foliage and in some cases even to apple foliage. 



The mixture should be strained through a sieve of 20 

 meshes to the inch in order to remove the coarse particles 

 of lime, but all the sulfur should be worked through the 

 strainer. 



Hot water may be used to good advantage in preparing 

 the mixture with sluggish lime, but with quick-acting lime 

 hot water is not best. The mixture may be kept for a week 

 or more without deterioration, but it should be thoroughly 

 stirred before using. 



In applying the self-boiled lime-sulfur wash the spray- 

 ing outfit should be equipped with a good agitator. The 

 agitator of the ordinary barrel sprayer is not usually ade- 

 quate. 



Sulfur-dust.'^'*^' ■'°-' ■''^"'- ^°''' ^^- — Very favorable reports have 

 appeared recently of the results secured by the use of sulfur 

 dust as a fungicide for apple scab in New York. Results 

 obtained by experiments carried on further south have not 

 been favorable to its use for this purpose. Thus Giddings 

 states that as the result of four years' trial it can not be 

 recommended for use on apples where scab or sooty blotch is 

 severe, or for the treatment of bitter-rot, black-rot, or blotch. 

 Brock finds in Illinois that spraying is much superior to 

 dusting for the control of fungi, but believes that in favored 

 localities, where fungi are comparatively easy to control, the 

 sulfur dust has its uses. 



Reddick and Crosby recommend, for the average Western 

 New York conditions, a mixture containing 85 per cent of 

 exceedingly finely ground sulfur (especially ground, "super- 

 fine") and 15 per cent of dry arsenate of lead (the "fluffy" 

 sort is used for this purpose). The exact quantity of mate- 

 rial to be used per tree will be determined by the wind, 

 the size and the shape of the trees, and also by the thorough- 



