204 Bulletin 252. 



Potassium sulfide (liver of sulfur), 3 oz. ; water, 10 gals. As 

 Potassium this mixture loses strength on standing, it should be made just 

 sulfide. before using. It is particular!}^ valuable for the powdery mil- 



dew of many plants, especially gooseberry, carnation rust, rose 

 mildew, etc. 



Copper sulfate, i lb. ; water, 15-25 gals. Dissolve the copper 

 Copper sulfate in the water. It is then ready for use. One pound in 



sulfate. twenty gallons of water has been found effective against peach 



leaf-curl. This mixture should never be applied to the foliage, 

 but must be used before the buds break. A much weaker solution has been recom- 

 mended for trees in leaf, but it is rarely used. 



Sulfur has been found to possess considerable value as a fungi- 

 Sulfur. cide. The flower of sulfur may be sprinkled over the plants, 



especially when they are wet. It is most effective in hot dry 

 weather. In rose houses, it is mixed with half its bulk of lime, and made into a 

 paste with water. This is painted on the steam pipes. The fumes destroy mildew 

 on the roses. Mixed with lime, it has proved effective in the control of onion smut 

 when drilled into the rows with the seed. Sulfur is not effective against black rot 

 of grapes, and many other diseases. 



Corrosive sublimate, i oz. ; water, 7 gals. An eft'ective solution 



Corrosive for potato scab. Soak seed potatoes one and one-half hours. 



sublimate It is also a good antiseptic for dressing wounds. After cutting 



solution. out fire blight or canker, swab the wound thoroughly with this 



solution. 



This is a gas dissolved in water. Commercially, it has a 



Formalin. strength of about fort}' per cent. One pint dissolved in thirty 



gallons of water is used effectively in preventing potato scab 



(soak tubers for half an hour, and plant in clean soil), or smut of oats and stinking 



smut of wheat (soak seed in solution for ten minutes, drain and sow the next day). 



The lime-and-sulfur wash has considerable value as a fungicide. 



Lime and For its preparation and use, see under insecticides. 



sulfur wash. A modified form of this wash, known as the "self-cooked" 



lime-sulfur wash, is now being recommended for the spraying of 



peaches, plums and apple foliage. It is said to cause no injury 



to the leaves or fruit. Good results have been secured in controlling brown rot and 



scab of peaches. Prepare as follows: Place ten pounds of sulfur and fifteen 



pounds of stone-lime in a barrel. Add hot water slowly to slake the lime, keeping 



the mass wet, but not sulnuerged. Stir occasionally. Part of the large lumps 



of lime may be kept out at first and added after slaking has progressed to some 



extent, thus prolonging the slaking and heating. When slaked, dilute to fifty 



gallons, and apply as you would Bordeaux. 



Resin, 2 lbs. ; sal soda, (crystals) i lb. ; water, i gal. Boil until 



"Sticker" or of a clear brown color — one to one and one-half hours. Cook in 



adhesive. iron kettle in tlic open. Useful for onions, cabbage and other 



plants hard to wet. Add tiiis amount to each fifty gallons of 



Bordeaux. For other plants, add this amount to every one hundred gallons 



of the mixture. This mixture will prevent the Bordeaux from being washed off 



by the heaviest rains. 



