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Development of the polyembryonic parasitoid Copidosoma floridanum in Trichoplusia ni

Trichoplusia ni (Hübner) (Lepidoptera: Noctuidae) parasitized by the polyembryonic egg‐larval parasitoid Copidosoma floridanum (Ashmead) (Hymenoptera: Encyrtidae) attained significantly larger final weights and head capsule widths than unparasitized controls. The difference in weight between parasitized and unparasitized hosts was not entirely accounted for by the weight of the C. floridanum brood. The head capsule widths of all parasitized and unparasitized fifth instars used in the study exceeded the critical threshold of 1.66 mm previously established for T. ni metamorphosis. The critical ratios associated with each T. ni instar of: 1) maximum weight within the instar:head capsule width and 2) maximum weight within the instar:weight at the beginning of the instar differed between parasitized and unparasitized larvae. Development of C. floridanum was synchronized with that of its host. Germ band formation and gastrulation of morulae destined to produce reproductive larvae invariably coincided with the host molt to the ultimate, fifth instar. Reproductive larvae had two instars. Eclosion from the egg to the first instar occurred during day 2 of the host's fifth instar, and ecdysis from the first to the second instar was synchronized with host cocoon spinning. Conversely, embryogenesis of morulae destined to produce precocious larvae began during the host first instar, continued through the second and third instar and ceased during the penultimate, fourth instar. Precocious larvae never molted and died when the host was consumed by the reproductive larvae.