cent nicotine by weight. Nicotine sulphate is without doubt 

 the safest and most efficient contact insecticide which can be 

 used for the control of sucking insects attacking vegetable 

 crops. 



The following formula will be found efficient for the control 

 of the average sucking insect : — 



Nicotine sulphate (40 per cent) , ^ pint. 



Hard soap, dissolved in boiling water, 2 pounds. 



Water, 50 gallons. 



If only a few plants are to be sprayed, the following mixture 

 should be used. 



Nicotine sulphate (40 per cent), 1| teaspoonfuls. 



Hard soap, dissolved in boiling water, . . . . | ounce. 

 Water, 1 gallon. 



The addition of a small amount of soap as recommended is 

 to increase the spreading and wetting properties of the spray. 

 Weigh out the amount of soap desired; shave into small, thin 

 pieces, and boil in a small quantity of water until dissolved. 

 Dilute this dissolved soap with the required amount of water 

 before adding the nicotine sulphate. Stir well before applying. 

 Do not use soap when nicotine sulphate is used in combination 

 with other sprays. 



Tobacco dust is of some value both as a repellent and as a 

 contact insecticide, but is only efficient under special con- 

 ditions. 



Soay Solutions. — Soaps of most kinds are valuable as sprays 

 for kilHng plant lice. Both potash (soft) and soda (hard) 

 soaps- are used at the rate of one-half pound in 1 to 2 gallons 

 of water. Whale-oil or fish-oil soaps, sometimes known as 

 potash fish-oil soap, are sold as insecticides, and when used at 

 the rate of 1 pound in (5 to 10 gallons of water prove efficient 

 in controlling plant lice, leaf hoppers, thrips, young squash 

 bugs, etc. 



