INSECTS AND PLANT DISEASES 83 



Spraying Mixtures for Plant Diseases. 

 (Bordeaux Mixture.) 



4 Ibs. unslacked lime $0.04 



6 Ibs. copper sulphate at 50 30 



Total $0.34 



Dissolve each thoroughly in 25 gallons of water. When both 

 are thoroughly dissolved, mix. Use wooden vessels. 



For Leaf -Eating Insects. 



YZ Ib. Paris green to 50 gallons water. Spray. 



Cost $0.15 



For Sap-Sucking Insects. 



2 gallons kerosene $0.25 



I Ib. hard soap ( i qt. soft soap) 10 



I gallon water 



Total cost $0.35 



The above are the best remedies in general use. The first two 

 may be combined, or rather the poison may be added to the first 

 mixture. 



FORMALDEHYDE SOLUTION. 



For Oat and Wheat Smut and Potato Scab. 



i pint (40 per cent) formaldehyde $0.50 



36 gallons of water 



Total $0.50 



Put seed in "gunny sack," soak in this solution for ten minutes, 

 and spread out to dry. The above solution is sufficient for 40 

 bushels of seed. 



Problems. 



i. Suppose it takes 200 gals. Bordeaux mixture to 

 spray an acre of potatoes. What is the cost of the 

 mixture ? 



