Two experimental conditions were tested to elucidate; i) how
long parasitism will occur when placing a single T. evanescensrelease
unit. New sentinel egg cards were placed every 3e4 days in
the box treated with T. evanescens without any further replacement
of the T. evanescens-release unit until week 3, ii) both newhost eggs
and T. evanescens release units were replaced every 3e4 days. The
untreated control boxes contained no parasitoids. Treatments were
replicated five times. The parasitoids were allowed to oviposit for
3e6 days in the treated boxes. T. evanescens adults still present on
the surface of the host egg cards were removed, and the host egg
cards were transferred singly into Petri-dishes. The samples were
placed under the same climatic conditions as above. After this
period, parasitized black host eggs, shrunk eggs (mortality), and
transparent eggs indicating moth larval emergence were recorded
under the stereo-microscope. Emerged F1 T. evanescens were
recorded and sexed as well.