Vegetable Plant Lice 



17 



are likely to follow the use of a vaporizer under every, or at most, 

 every other sash and the application of gas with a gentle or no wind 

 during cloudy weather or in the late evening, for an exposure of 

 45 minutes. 



On Peas and Beans 



In New Jersey, peas suffer severely nearly every year and beans 

 are occasionally infested. The writer has had so little experience in 

 treating either of these crops that he hesitates even to attempt to offer 

 any help. Where either crop is grown broadcast the control of aphis, 

 except on very small plots, would appear to be impracticable. 



Where planted in rows and before the recumbent habit makes 

 its appearance, treatment by means of a spraying device, such as that 

 recommended for potatoes and tomatoes should destroy the lice. It 

 is very probable that the initial lice infestation appears before the 

 recumbent habit develops. 

















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Fig. 12 



Engine-Driven Potato Sprayer Adapted to Spinach 



On Beets and Spinach 



The louse problem on beets and spinach, particularly the latter, 

 is one of the most difficult with which the writer has come in contact. 

 The field beet problem may be met as hereafter described for turnips. 



