Overwintering of Trichogramma (Trichogrammanza) funiculatum Carver was studied under seminatural temperate conditions by considering development time within eggs of the light brown apple moth, Epiphyas postvittana, and survival of adult wasps. Maximum and minimum mean development times were 84 and 63.6 d, respectively, for egg masses parasitized in early winter, and 72.6 and 51.5 d, respectively, for eggs parasitized mid-winter. Adults survived a maximum of 20 d in early winter and 22 d mid-winter. Maternal age did not influence either the development time or longevity of progeny. The lower temperature threshold at which T. funiculatum parasitized host eggs was between 8°C and 9°C. The relationship between temperature and development time in the laboratory was successfully used to predict the emergence of T. funiculatum at low temperatures and under the seminatural conditions. This implies that there is no diapause in T. funiculatum. Instead this species overwinters via a combination of slow development, or quiescence, coupled with increased adult longevity. This information should be useful in enhancing populations of this parasitoid in spring when T. funiculatum can suppress light brown apple moth and other pests.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.