| Summary: | The parasitizing efficiency and emergence rate of the egg parasitoids, <em>Trichogramma pretiosum </em>and <em>Trichogramma chilonis </em>on one-day, two-day and three-day old eggs of <em>Leucinodes orbonalis </em>was studied under laboratory condition during three different seasons at Bio-control Laboratory of Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore, India. The parasitizing ability of <em>T. pretiosum</em> reproduced through parthenogenesis reproduction in three different seasons was also investigated in a similar manner. No parasitism of <em>L. orbonalis </em>was observed by <em>T. chilonis</em> whereas, <em>T. pretiosum </em>expressed maximum parasitism. The findings clearly described the vulnerability of <em>T. pretiosum </em>to weather conditions that exist in the summer season. It was noted that the parasitoid, <em>T. pretiosum </em>preferred one-day-old eggs of <em>L. orbonalis </em>for parasitism during all seasons. <em>T. pretiosum </em>also expressed parthenogenesis reproduction to parasitize the eggs of <em>L. orbonalis</em>. The results indicated the usefulness of <em>T. pretiosum </em>in parasitizing eggs of <em>L. orbonalis</em>.
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