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Innate differences in consumption and utilization of food by the fast‐ and slow‐growing larvae of cabbage looper, Trichoplusia ni (Hübner) (Lep., Noctuidae)

Consumption and utilization of soybean leaves by the fast versus slow‐growing larvae of the cabbage looper, Trichoplusia ni were studied under laboratory conditions. Fast‐growing larvae consumed more food/unit of body mass, and gained weight 10 times faster than the slow‐growing larvae. Slow‐growing larvae were less efficient in consumption and utilization of food, and the differences in indices of food utilization were greater between the fast‐ and slow‐growing larvae on the relatively resistant soybean cultivar, “PI 227687” than on the susceptible cultivar, “Davis”. Implications of differences in growth rates and food utilization by the fast‐ and slow‐growing larvae on resistant and susceptible cultivars are discussed in relation to evolution of new biotypes and host‐plant resistance.