Hilal TUNCA, Ayşe Nazan YEŞİL, Türkan Feyza ÇALIŞKAN

Cold storage possibilities of a larval parasitoid, Venturia canescens (Gravenhorst) (Hymenoptera: Ichneumonidae)

Bu çalışmada parazitoit Venturia canescens (Gravenhorst) (Hymenoptera: Ichneumonidae)’in biyolojisi üzerine soğuk depolamanın etkileri çalışılmıştır. Depolama çalışmaları larva parazitoiti V. canescens’in ergin öncesi ve ergin döneminde gerçekleştirilmiştir. Parazitoitin ergin öncesi dönemi 5, 10, 15°C sıcaklıklarda ve 1, 3, 5, 7, 15 gün konukçuları Ephestia kuehniella Zeller (Lepidoptera: Pyralidae) ve Plodia interpunctella Hübner (Lepidoptera: Pyralidae)’nın son larva dönemi içinde depolanmıştır. Benzer olarak ergin parazitoitler aynı sıcaklık derecelerinde besinli ve besinsiz koşullarda depolanmıştır. Çalışma sonucunda depolama sıcaklığı, depolama süresi ve konukçu farklılığının V. canescens’in gelişimini etkilediği belirlenmiştir. Parazitoitin iki konukçuda da 5°C’de 5, 7 ve 15 gün depolama sürelerinde gelişim göstermediği belirlenmiştir. Benzer olarak parazitoitin konukçu P. interpunctella üzerinde 10°C’ de 15 gün depolanmasıyla da gelişim gösteremediği bulunmuştur. Depolama sıcaklığının düşmesi ve depolama süresinin artması parazitoitin gelişme süresini arttırırken, çıkış oranını azaltmıştır. Çıkış oranındaki azalma konukçu P. interpunctella üzerinde daha fazladır. Yaşam süresi ve ergin ağırlığı iki konukçuda da düşük sıcaklıkdan daha az etkilenmiştir. Ergin parazitoiter için hem besinli hem de besinsiz ortamda ve heriki konukçuda en uygun sıcaklık derecesinin 10°C olduğu belirlenmiştir. Sonuçlar, depolama çalışmalarında V. canescens için E. kuehniella’nın daha uygun bir konukçu olduğunu göstermektedir.

Larva parazitoiti Venturia canescens (Gravenhorst) (Hymenoptera: Ichneumonidae)’in soğuk koşullarda depolanması

The effects of cold storage on the biology of the larval parasitoid Venturia canescens were tested. Storage studies were conducted in two stages, pre-adult and adult stage of the larval parasitoid, Venturia canescens (Gravenhorst) (Hymenoptera: Ichneumonidae). Pre-adult stage of parasitoid was stored in last larval stage of the hosts, Ephestia kuehniella Zeller (Lepidoptera: Pyralidae) and Plodia interpunctella Hübner (Lepidoptera: Pyralidae) at 5, 10, 15°C for 1, 3, 5, 7, and 15 days. Similarly adult parasitoids were stored the same temperatures for honey feeding and non-feeding condition. Storage temperatures, Storage period and host effects on V. canescens development were evaluated. The parasitoid did not develop at 5°C for 5, 7 and 15 day storage period on both hosts. Similarly parasitoid did not develop at 10°C for 15 day storage period on the host P. interpunctella. Decreasing of temperature and increasing of storage time resulted in increasing in the parasitoid development time, but reducing emergence rate. This reduction of emergence rate was higher in P. interpunctella. Longevity and adult dry mass were less affected by low temperature in both hosts., the most suitable temperature for feeding and non-feeding condition on both hosts was found to be at 10°C for the adult. The results suggest that E. kuehniella could be more suitable host for V. canescens.

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We are grateful to the Scientific and Technical Research Council of Turkey for their financial support.
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