MEXICAN BEAN BEETLE IN THE SOUTHEAST. 33 
arranged by insecticides. Table 13 gives results of spray experi- 
ments arranged by insecticides. The infestation was not as severe 
as in 1921, and comparisons between experiments must take into 
consideration the degree of infestation. 
Fic. 13.—Spraying beans against the Mexican bean beetle with a wheelbarrow sprayer mounted 
on a slide. 
__ In comparing results with different insecticides, the plant-injury | 
factor as well as the insect-control factor must be taken into con- | 
sideration. The plant-injury factor is apparent in yields harvested 
Fic. 14.—Spraying small field beans with a hand sprayer to control the Mexican bean beetle. 
when infestation is ight, but in some cases does not show, except by 
comparison, when yield is heavy. The notes taken during the experi- 
ments showing observations of visible injury give very accurate data 
80333°—247 3) 
