Abstract
Laboratory experiments were conducted to evaluate the influence of repeated and delayed exposure to fresh codling moth eggs on the parasitism of Trichogramma cacoeciae Marchal and T. principium Sug. et Sor. The percentage survival of T. cacoeciae and T. principium females significantly declined as the number of exposure times increased (or as the females became older). The highest mean number of parasitized eggs and F1 progeny were recorded during the first day of exposure, after which they declined. However, the percentage mortality of parasitized eggs of T. cacoeciae and T. principium was negatively correlated with repeated exposure. When the exposure of T. cacoeciae and T. principium females to host eggs was delayed for 3 days after emergence, the percentage of oviposited females was not affected; however, the mean number of parasitized eggs, F1 individuals and the percentage mortality declined significantly. The current study provided essential information necessary to determine the optimal timing of parasitoid releases to increase the efficiency of T. cacoeciae and T. principium against codling moth.
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We thank I. Othman (Director General of the Atomic Energy Commission of Syria) and N.D. Sharabi (Head of Department of Agriculture) for their help and support.
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Makee, H. Effects of repeated and delayed exposure to codling moth eggs on reproduction of Trichogramma cacoeciae and T. principium (Hymenoptera: Trichogrammatidae) females. J Pest Sci 78, 83–89 (2005). https://doi.org/10.1007/s10340-004-0072-3
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DOI: https://doi.org/10.1007/s10340-004-0072-3