INSECTICIDES. 15 



half an hour. Then add about 90 gallons of water to the 

 mixture, and it is ready for use. Apply it warm, by 

 means of a spray-pump. Used warm, its effect is better 

 and less material is required than when cold. For scale 

 on deciduous trees in summer. (Californian.) 



Sulphur. Fumes of sulphur are destructive to insects, but 

 should be carefully used or plants will be injured. The 

 sulphur should be evaporated over an oil-stove, until the 

 room is filled with the vapor. The sulphur should never 

 be burned, as burning sulphur kills plants. For green- 

 house use. 



Sulphur and snuff. 1 pound of flowers of sulphur, 1 

 pound of Scotch snuff, 1 pound of quicklime, pound of 

 lampblack, 1 pound of soft soap, with sufficient water to 

 make them into the consistency of paint. Wash every 

 branch, from the ground upwards, with a common paint- 

 brush, before the blossom-buds begin to swell. For plant- 

 lice. 



Sulphur and whale-oil soap wash. Boil 14 gallons of water, 

 add ^ pound of sulphur and boil fifteen minutes. To 

 this add a pound of whale-oil soap and boil_for five minutes. 

 Let stand for a week. When wanted for use, mix 1 pound 

 of the compound to a gallon of water, and apply as a spray 

 at a temperature of 130 Fahrenheit. Used for various 

 burrowing larvae, as the gooseberry fruit-worm and the 

 currant-borer, as a repellent. 



Tar is sometimes used to prevent the female and wingless 

 canker-worm from ascending trees. The tar should be 

 placed on cotton, or some material which will prevent it 

 from coming in contact with the bark, and a band of the 

 preparation is then placed around the trunk. Care must 

 be taken to see that the tar does not injure the tree. 

 Tarred paper may be rolled loosely about trees to keep 

 away mice, but it should be removed before warm weather. 

 It is sometimes recommended as a preventive of the attacks 

 of borers, but it very often injures trees, and should be used, 

 if at all, with great caution. 



