Hi) 



I]%SE€TICIB>ES. 



Insecticidos of leading impoitauce are riliown in this collection. The 

 method in which each one is niix( d or applied is generally stated under 

 its name. 



350. ACETIC ACID. 



■In dilution to about 10 to 1-3 per cent, of the acid. It is applied as a 

 spray. 



Arisenic'ul Mixtures. 



For fuller particulars .see Bull. 3, U. S. Ent. Comm. on the Cotton Worm ; the 

 report of the Department on the same subject, and the reports of the Entomologist 

 since 1878. 



351. ARSENIC. 



The White Arsenic as a powder is mixed in baits for destroying insects. 

 It is also used on field crops. To 20 lbs. of flour i lb. of arsenic is added 

 and thoroughly mixed. This is then applied by a sifter or blower. A 

 solution of 8 ounces in 40 to 80 gallons of water may be sprayed. 



Arsenic scalds the plants to such an extent that one of the two follow- 

 ing is generally preferred. 



352. LONDON PURPLE. 



To 20 lbs. flour from i to =] lb. is added and well mixed. This is ap- 

 plied by a sifter or blower. With 40 gals, water i to ^ lb. is mixed for 

 spraying. 



353. PARIS GREEN. 



With 20 lbs. flour from I to 1 lb. is mixed, and applied by sifting or 

 by a blower. The same amount to 40 gals, water is used as a spray. 



354. PARIS GREEN— Adulterated. 



This is to be avoided. It is ([uite commonly sold by the trade. Its 

 color is generally lighter than the pure green. 



