64 BEAN CULTURE 



with 3 ounces of bisulphide of carbon, which may be 

 poured on the beans. Care must be taken to close 

 the top tightly ; the exposure should be for 48 hours. 

 The bisulphide should be of the best quality because 

 this will vaporize without any residue. The vapor 

 of this substance is very inflammable and the work 

 should, therefore, be done at a distance from other 

 buildings and no light of any kind be brought near. 

 For complete details of the bisulphide of carbon 

 treatment see "Fumigation Methods" by Prof. W. 

 G. Johnson, published by the Orange Judd Com- 

 pany of New York. 



The four spotted bean weevil {Bruchus quadrimac- 

 ulatus) differs from the common cowpea weevil in 

 that the ground color is black with black, gray and 

 white pubescence. The antennae are serate and not 

 pectinate in the male. Chittenden* says the species 

 is undoubtedly exotic, but its origin and the time of 

 its introduction are obscure. Its distribution ex- 

 tends throughout the South and in all probability 

 wherever cowpeas grow. It is evidently acclimated 

 as far north as Iowa. Fig. 18 illustrates a bean af- 

 fected by this insect. The cowpea is the favorite 

 food, the Blackeye variety seeming to be preferred. 

 Peas and beans of various sorts are also attacked. 

 It is advisable to keep seed in a perfectly dry atmos- 

 phere. The remedies are the same as for the com- 

 mon bean weevil. 



Foreign bean weevils. — Chittenden says* in for- 

 eign countries there are other species of bean and 

 pea weevils, two of which are of sufficient impor- 

 tance to command the attention of growers in the 

 United States. These foreign weevils have been 



*U S Year Book dept agri, 1898. 



