222 MINNESOTA STATE HORTICULTURAL SOCIETY. 



Spraying Mixture. 



PROF. A. G. RUGGLES AND PROF. E. C. STAKMAN, UNIVERSITY FARM. 



Arsenate of Lead. 



This is probably the best "all around" stomach insecticide 

 yet discovered. It is either a homemade or commercial prod- 

 uct. The homemade material is not often satisfactory; hence 

 we prefer the commercial material. 



Of the ordinary prepared paste found on the market, use 

 3 pounds to 50 gallons of water; of the commercial powdered 

 form use IV2 pounds to 50 gallons of water or the fungicide. 



The formula for sweetened arsenate of lead to be used on 

 cabbage or radish maggot is: 



Lead arsenate paste % ounce 



New Orleans molasses y% pint 



Water 1 gallon 



If rains wash the mixture off during the time the flies are 

 active, (May 1-20 and July 1-20) spraying must be done over 

 again. 



Lime-Sulphur. 



Lime-sulphur is both an insecticide and a fungicide. It 

 was first used as a sheep-dip and then came into use as a scale 

 insecticide. Since that time, many improvements have been 

 made in its formula. 



The concentrated lime-sulphur is both an insecticide and 

 a fungicide. At the rate of one gallon to nine of water, it is 

 used only when the trees are dormant, at that time killing 

 principally the scale insects. At the rate of one gallon to forty 

 of water, it is primarily a fungicide and is used with arsenate 

 of lead when trees are in foliage. The following is the formula, 

 although it probably is much better to buy the commercial 

 product on account of its constant chemical properties : 



50 lbs. fresh unslaked lime 95% pure. 

 100 lbs. sulphur thoroughly and finely pulverized. 

 Water to make fifty gallons. 



After proper mixing, this must boil 45 to 50 minutes. 



See table for proper dilution of concentrated lime-sulphur 

 following on second page. 



A resin mixture is often needed to make Bordeaux mixture 

 or other spray compound stick to a smooth surface, such as 

 raspberry canes when spraying for anthracnose. The resin 

 lime mixture is made as follows: 



