132 SPRAY MACHINERY AND SPRAY MATERIALS 



properly made will not burn the foliage to any extent. More 

 pounds of the paste form must be used to a given quantity 

 of water than the powder form because of the amount of 

 moisture present in the paste. 



PARIS GREEN. 



Paris green I to 1 pound 



Stone lime ... 2 to 3 pounds 



Water 50 gallons 



The chief fault with the Paris green is its tendency to burn 

 the foliage. If it is not added to some fungicide, stone lime 

 should be added to the water in order to reduce the amount of 

 burning of the foliage. If Paris green is used in combination 

 with Bordeaux mixture the addition of lime is not necessary. 

 This insecticide is a very active poison. 



WHITE HELLEBORE. 



When Used as a Spray. 



White hellebore 1 ounce 



Water 3 gallons 



When Used as a Powder. 



White hellebore 1 ounce 



Air-slaked lime, flour or sifted road dust .... 5 ounces 



PYRETHRUM. 



When Used as a spray. 



Pyrethrum 1 ounce 



Water 2 gallons 



When Used as a Powder. 



Pyrethrum 1 ounce 



Air-slaked lime, flour or sifted road dust .... 5 ounces 



The white hellebore and the pyrethrum lose their poisonous 

 properties quickly when exposed to the air. These insecti- 

 cides are poisonous to insects but not to higher animals. 

 They are valuable to use on ripening fruit or just before the 

 harvesting of such crops as the lettuce or the cabbage. These 

 poisons must be strictly fresh or they are worthless. 



FORMULAS FOR CONTACT POISONS 



Lime-sulphur Wash. 



Stone lime 12 to 15 pounds 



Flowers of sulphur .15 pounds 



Water 50 gallons 



