43^ AGRICULTURE CF MAINE. 



Formula ii. tobacco decoction. 



Tobacco stems or tobacco dust 2 pounds 



Water 4 gallons 



Put the tobacco in the water, enough to cover, which may be 

 either cold or hot. Place over the fire and when the water has 

 reached the boiling point, remove some of the fire and allow 

 the water to simply simmer for fully one hour, when the liquid 

 is ready to be drained ofif, diluted to the above proportions and 

 applied. Boiling violently drives off the nicotine. 



If whole-leaf tobacco is used, prepare as above, using one 

 pound of tobacco to each four gallons of water. 



No lime or other alkaline substance should be added to the 

 tobacco while cooking. Apply at once, or within a few days 

 after making if possible. 



Black Leaf. — There is nothing to do in the preparation of 

 Black Leaf except to thoroughly stir the contents of the can 

 before pouring out any quantity for dilution. In most cases 

 one gallon of the Black Leaf will be found sufficient for each 

 seventy gallons of water. But if in the treatment of any louse 

 this does not seem sufficient it may be used in proportion of 

 one gallon to sixty or sixty-five gallons of water. Careful 

 sprayers have usually succeeded in killing plant lice with this 

 preparation in the proportion of one gallon to each one hun- 

 dred gallons of water. Thoroughness of application is of as 

 much importance as the strength of the material used. 



Formula 12. caustic soda. 



Caustic soda i ounce 



Water 2 gallons 



The soda dissolves readily and may be used in any amount 

 desired. It is a strong caustic, however, and must be used with 

 care, and only when the trees are dormant. 



FORMULAS FOR COMBINED INSECTICIDES AND FUNGICIDES. 



Make a smooth paste of the poisons and a little water, add to 

 the Bordeaux mixture and stir thoroughly. Apply at once. 



Formula 13. 



Paris green j/2 pound 



Bordeaux mixture (Formula i).... 50 gallons 



