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Trichogramma euproctidis  (Girault) is an egg parasitoid under consideration for mass production and augmentative biological control of major lepidopteran pests in Iran and other countries. The main objective of this research was to determine the effects of  T .  euproctidis  female age and  Ephestia kuehniella  Zeller egg age on life history parameters of  T .  euproctidis . Experimental design involved exposing 1-, 2-, 3-, or 4-d-old  E .  kuehniella  eggs to 1-, 2-, 3-, or 4-d-old  T .  euproctidis  females in glass test tubes. Results indicated that host egg age and parasitoid female age interacted significantly to improve parasitism rate, progeny emergence rate, sex ratio, longevity, and fecundity of  T .  euproctidis . The age of  T .  euproctidis  females affected parasitism rate; 1-d-old females, rather than the other ages, parasitised more  E. kuehniella  eggs. The highest mean total fecundity (81.62 eggs) was recorded from adult progeny produced by 1-d-old  T .  euproctidis  females reared from 1-d-old  E .  kuehniella  eggs.  Trichogramma euproctidis  development time increased as the age of  E. kuehniella  eggs increased, but the parasitoid female age and host egg age interaction was not significant. A life table analysis confirmed the results that 1-d-old  T .  euproctidis  females and 1-d-old  E .  kuehniella  eggs resulted in optimal effects on  T .  euproctidis  life history. This study implies that mass rearing systems designed to expose young-aged  T .  euproctidis  females to young-aged  E .  kuehniella  eggs would maximise  T .  euproctidis  progeny production.

Parasitoid age and host age interact to improve life history parameters and rearing of Trichogramma euproctidis