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The noctuid Helicoverpa armigera is an economically important pest of agricultural crops in Iran and other countries. Research is evaluating the capacity of Trichogramma parasitoids to control H . armigera populations on field crops. The objective of this research was to determine if young rather than old H. armigera eggs were optimal for Trichogramma &amp;nbsp; euproctidis development, reproduction, and life table parameters. Bioassays involved exposing T . euproctidis mated females to H . armigera 14, 38, or 62 h old eggs within 24 h in laboratory arenas. Results indicated that the number of host eggs parasitized successfully by T. euproctidis decreased as host egg age increased. Host egg age had no significant effect on T . euproctidis adult emergence. Adults that developed in 14 h old eggs had greater longevity and fecundity than those that developed in 38 h or 62 h old eggs. The intrinsic rate of increase ( r ) was greatest, and the mean generation time (T) was lowest for T. euproctidis reared in 14 h old eggs. This study indicates that young H . armigera eggs are more suitable than old ones for T . euproctidis development and reproduction. This study is important because it provides evidence, for the first time, that T. euproctidis can utilize H . armigera as a rearing host. Using young rather than old host eggs could ensure the persistence of a T . euproctidis mass production system to support augmentative releases.

Effects of Helicoverpa armigera Egg Age on Development, Reproduction, and Life Table Parameters of Trichogramma euproctidis