88 



30. Kerosene or Crude Oil : 



A thin film spread over the surface of a mosquito-breeding pool 

 or container will destroy the wrigglers. For large scale work, 

 the cheaper crude oil may be used and evaporation will occur 

 less rapidly. Four parts of heavy oil 18 to one part light oil 30 

 to 35 gravity will spray readily from nozzles. Drainage or other 

 permanent work should have precedence over temporary treatments. 



31. Pyrethrum or Buhach: 



Fresh material dusted around floors and walls will reduce the 

 number of fleas and other household insects. 



32. | Formalin: A 5% solution of formaldehyde sweetened with 

 sugar and placed in shallow vessels makes a satisfactory fly poison. 



Proper disposal of manure and garbage, however, is the basis 

 for house-fly control. 



33. Ant Poison: 



Syrup containing between ^4 an d % of one per cent arsenic. A 

 sponge saturated with the arsenic solution and placed in a small 

 fruit jar with perforated cover should be placed where ants fre- 

 quent. Carbon bisulphide or cyanide solution may be applied to 

 the nests in the ground. 



Fungicides 



1. Bordeaux Mixture: 



Nearly fill two 50 gallon barrels with water; put 50 pounds 

 of bluestone in a sack and suspend near the top in one barrel. 

 This plan hastens it in dissolving. Then slack 50 pounds of good 

 stone lime by adding a little water at a time, stirring it to a thick 

 smooth paste, then add water to make a liquid, then pour it into 

 the other barrel. Now each gallon from these barrels will con- 

 tain one pound of the solid ingredients. Nearly fill two other 

 barrels or the spray tank with cold water and strain in the stock 

 solutions both kinds running slowly at the same time while the 

 water is well stirred. The proportions are bluestone 5 pounds, 

 lime 6 pounds and water 50 gallons. These proportions may vary 

 from 3 to 8 pounds of bluestone, always using a little more than 

 an equal weight of lime. The leafless tree will bear much stronger 

 spray than the leaves, and it can be used much stronger in rainy 

 weather than in fair weather. Keep it well stirred when spraying. 



