INSECTS AND OTHER ANIMAL Pests INsguRIOUS To FIELD BEANS QS81 
appearance. Older slugs, however, eat parts from the edges of the leaves, 
and frequently continue to feed until every leaf is devoured (fig. 91, B): 
Fie. 92. RADULA OF AGRIOLIMAX AGRESTIS, AND RESULTS OF WORK 
OF SLUG 
A, Radula, or lingual ribbon, of slug, made up of many hundred small, sharp 
teeth, X 25. B, Young bean plants showing result of feeding by the slug. C, A 
bean field in Monroe County, New York, in parts of which all the plants were 
destroyed by slugs; bare areas shown. 
Sometimes the petiole and a few of the main veins are left, but oftener 
the entire plant above the surface of the ground is destroyed. During 
