Pupal Size and Mortality, Longevity, and Reproduction of Cabbage Loopers Reared at Several Densities1

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Abstract
The number of pupae of the cabbage looper, Trichoplusia ni (Hübner), harvested per 0.18- or 0.24-liter (6- or 8-oz) rearing container decreased with the increasing number of larvae reared per container. Pupal weights of both sexes were significantly reduced at high larval densities; but mating, moth mortality, oviposition, and egg viability of adults from larvae reared at high densities were not affected. Providing more surface area within the rearing container had no effect on number of larvae that pupated. When 2, 4, 6, or 8 larvae were reared in 0.030-liter (1-oz) containers supplied with 10 or 15 ml of medium, results were similar. High adult density in cages resulted in reduced oviposition and increased mortality.

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