WEEVILS IN SEED PEAS OR BEANS 



85 



The best results are likely to accrue if the baiting is done a 

 few days before the planting is started, but some degree of 

 success may be attained by scattering the bait after the plants 

 are set. 



Repellants may be effectively used against the striped beetle. 

 Any material possessing an odor offensive to the insect in ques- 

 tion may be used. Among the common repellants are turpentine 

 and crude carbohc acid. Either of these may be mixed with ashes, 

 land plaster or other fine, dry powder, and dusted upon the 

 plants by means of a coarsely woven sack or perforated tin can. 



Fig. 46. — Cabbage seed-bed screened with cheese cloth to keep out the cabbage maggot. 



Diseases which are transmitted on the seed may often be 

 controlled by treatment of the seed before planting. This is 

 especially true of the potato scab. The usual treatment is to 

 soak the seed tubers for two hours in a solution of formalin made 

 by mixing a pint of formaldehyde with thirty gallons of water, 

 or for one and a half hours in a solution of corrosive sublimate 

 containing one ounce of the chemical to eight gallons of water. 

 Care must be taken to avoid re-infection of the tubers by contact 

 with infected receptacles before they are planted. 



Weevils in seed peas or beans can be killed by treatment with 

 carbon bisulfide. The seeds are placed in an air-tight receptacle 

 and a quantity of the liquid poured out into a shallow dish which 

 is set on top of tlu* mass of s(hh1s. The liquid quickly evaporates, 



