4 



and no other manipulation is required for the spray than simply 

 to dissolve the chemical in water. At the Station iron sulphate 

 has been used upon spurge, cockle-bur, lantana, oi, pig-weed, 

 Japanese nut-grass and other weeds. When used at the rate of 

 three pounds per gallon of water, iron sulphate killed all these 

 weeds except lantana and J apanese nut-grass. The leaves were 

 destroyed on lantana but the new buds were sent out, showing 

 that the steins were not killed. The portion of Japanese nut- 

 grass above ground soon turned brown and died after being 

 sprayed with iron sulphate, but fresh shoots came up from the 

 under-ground bulbs. This chemical can be used effectively 

 against most weeds except lantana and Japanese nut-grass, and 

 has the advantage of not being poisonous or in any way injur- 

 ious to the soil. 



Carbolic Acid. When diluted at the rate of 1 quart in 8 

 gallons of water, Jones 1 observed little effect on common weeds 

 from spraying with carbolic acid. On the other hand, Voelcker 2 

 obtained satisfactory results from spraying wild onion with a 

 5 per cent solution of carbolic acid, and the same chemical proved 

 effective in experiments on miscellaneous weeds at the Massa- 

 chusetts Experiment Station. 



Benzine. This substance has been tested on a small scale in 

 destroying weeds in gardens in various localities. Stone 3 reports 

 that a 50 per cent mixture of equal parts benzine and gasoline 

 in water was effective against the less hardy weeds. 



Kerosene. In preparing kerosene mixture as a spray for 

 sucking insects, it is always recommended that care be taken not 

 to leave any of the kerosene uncombined with the soap in the 

 mixture, for the reason that if uncombined the kerosene may 

 burn the foliage. Kerosene has a slight burning effect on the 

 foliage of various trees. It was tried by Wilson 4 as a spray for 

 weeds at the rate of 6V2 gallons per square rod. When thus 



1 Vt. Sta. Rept. 1901, p. 248. 



•2 Jour. R. Agr. Soc. Eng. 63 (1902) p. 360. 



a Mass. Rept. 1908, Pt. I, pp. 62-72. 



t .Minn. Sta. Bui. 95. 



