THE BEETLE 41 



Spraying Mixtures for Plant Diseases 

 (Bordeaux Mixture.) 



5 Ibs. unslacked lime '. . .$0.04 



3 Ibs. copper sulphate at lOc 30 



Total $0.34 



Dissolve each thoroughly in 25 gallons of water. When both 

 are thoroughly dissolved, mix. Use wooden vessels. Strain -care- 

 fully into spray-pump, barrel, or tank. 

 Lime-Sulphur 



1^4 gallons lime-sulphur $0.20 



50 gallons water. 



For Leaf-Eating Insects 

 y<t lb. Paris green to 50 gallons water. Spray. 



Cost $0.15 



3 Ibs. arscnate of lead to 50 gallons water. 



Cost $0.45 



Asenate of lead sticks to the plant much better than Paris 

 green, and is therefore more useful, especially in rainy seasons. 



For Sap-Sucking Insects 



2 gallons kerosene $0.25 



1 lb. hard soap (1 qt. soft soap) 10 



1 gallon water 



Total cost $0.35 



Problems 



1. Suppose it takes two applications of two pounds 

 of lead arsenate each, and two days' time at $1.00 per 

 day to destroy the bugs on an acre of potatoes, how 

 many bushels of potatoes at 50c per bushel will it take 

 to pay for the treatment? 



2. If one house fly lays 80 eggs four different times y\ 

 during the summer, and half of these eggs hatch female 

 flies, each one laying the same number of eggs as the 

 first fly, and so on to four generations, how many flies 

 would come from the first fly during the summer? 



3. P'ind out the average yield of honey from hives 

 in your community, and calculate the income from a 

 hive of bees at the prevailing price paid for honey. 



