BEAN APHIDS 



243 



common weeds, migrating in May or June to beans. Aphids mul- 

 tiply during summer by giving birth to living young. 



Control. The usual remedies applicable to other plant lice 



FIG. 251. The bean maggot fly, different stages, and its work. (After Lugger.) 



may be used here if necessary. Whale-oil soap, one pound to five 

 or six gallons, is probably safer than kerosene emulsion or laundry 

 soap in the same proportion. One or two tablespoonfuls of 

 nicotine sulfate in a gallon of water is an excellent and effective 



