LIME-SULFUR 



36-80-50 Formula 



Lime-sulfur is an amber colord liquid con- 

 taining calcium polysulfids, CaS4 and CaSs, 

 and some calciimi thiosulfate, CaS203. It is 

 made by boiling lime with a suspension of 

 suKur. It first came into use as an insecticide 

 on the Pacific coast about 1900 to combat the 

 San Jose scale. Previous to that time a 

 ''Lime, Sulfur and Salt" mixture had been 

 used as a sheep wash. Nowadays its use in 

 more dilute solutions is extending rapidly to 

 control ''blights" or fungus diseases, while 

 the stronger solution is still one of the stand- 

 ard remedies for scale insects. In the 

 stronger solutions it is appl^ed during the late 

 winter or early spring before the buds burst. 



Procedure. — Select a beaker or porcelain 

 dish of 400-500 cc. capacity, measure into it 

 200 cc. of water, and mark the level of the 

 liquid so that the mark can be recognized 

 after the dish is used for boiling. Weigh out 

 38 grams of quicklime, and slake it in the 

 proper amount of water. Weigh out 80 

 grams of sulfur flour and make this into a 

 thoroly moistend paste with about 200 cc. of 



50 



