Beans, peas, cowpeas, soybeans and corn
Identification: The bean leaf beetle adult is 1/4 inch long, yellowish or reddish, with or without four black spots and two marginal stripes on the back. Despite the variability in color and pattern, the adult always has a black triangular spot at the base of the wing covers, behind the "neck".
The adult beetles eat holes in the leaves and pods of beans. They feed heavily on the seedlings and may kill or severely stunt them. The larvae feed on the roots and can cause damage by girdling the stem just below the soil line.