METHOD: Feeding Behavior CONDITIONS: Field METHOD NARR: The total glycoalkyloid concentration in foliage was determined using ELISA. The weight and developmental stage of the larvae on different host plants were determined dailyThe susceptibility to fungus of insects reared on different host plants was determined in a bioassay. Insects were dipped in fungus and returned to host plants. Mortality was assessed daily for 8 days. RESULTS NARR: Therean weights of larvae reared on the different plants. Pupae reared from ktz 472925 and chc 189220 weighed significantly less than those fed tbr (Lenape). Tere wre no significant differences in the duration of a particular insth host. The survival of larvae through each instar on the different hosts varied significantly. Rearing larvae on different hosts did not cause significant differences in their susceptibility to B. bassiana.