22 BULLETIN 807, U. S. DEPARTMENT OF AGRICULTURE. 



Germination of seed a year or more old is only slightly less than 

 that of new seed. 



There are no natural enemies of the broad-bean weevil of any con- 

 sequence in America. 



It requires 170° to 180° F. for over half an hour to kill all of the 

 weevils in broad beans. 



Sulphur is unsatisfactory as a fumigant. 



Carbon clisulphid at the rate of 7 pounds per 1,000 cubic feet in 

 a tight box for 24 hours kills all the weevils. 



In seed held over until the second year all the weevils are dead. 



Beans from crops planted late, after March 1, are much less in- 

 fested than those planted earlier, from November to March. 



LITERATURE CITED. 



(1) CuETis, John. 



1860. Farm insects. London. 



(2) Chittenden, F. H. 



1911. Notes on various trucli-crop insects. U. S. Dept. Agr., Bur. Ent. 



Bui. 82, pt. 7. 



(3) . 



1912. Tlie broad-bean weevil. U. S. Dept. Agr;, Bur. Ent. Bui. 96, pt. 5. 



(4) U. S. Department of Ageicultuke, Bukeau or Chemistky. 



1915. Service - and regulatory announcements. No. 14, item 131. Au- 

 gust 18. 



(5) . . - _ 



1915. Service and regulatory announcements. No. 15, item 151. No- 

 vember 4. 



(6) Hinds, W. E. 



1917. Carbon disulphid as an insecticide. U. S. Dept. Agr., Farmers'^ 



Bui. 799. 



(7) Back, E. A., and Duckett, A. B. 



1918. Bean and pea weevils. U. S. Dept. Agr., Farmers' Bui. 983. 



(8) McKee, Roland. 



1918. Horse beans. U. S. Dept. Agr., Farmers' Bui. 969. 



(9) U. S. Department of Agriculture, Bureau of- Chemistry. 



1918. Service and regulatory announcements. Supplement No. 35, items 

 5246, 5248. February 21. 



