Population changes of Trioxys pallidus, a parasitoid of walnut aphid in Qazvin province | ||
| تحقیقات حمایت و حفاظت جنگلها و مراتع ایران | ||
| Article 2, Volume 3, Issue 1, May 2005, Pages 23-30 PDF (771.46 K) | ||
| Document Type: Research Paper | ||
| Author | ||
| A. Mohammad Baigi | ||
| Abstract | ||
| Trioxys pallidus (Hall.)is one of the most important natural enemies of walnut aphids in almost all walnut orchards. Unfortunately in recent years, insecticide spraying as a common pest control measure in walnut orchards, has had negative impacts on this parasitoid population. In order to study the population changes, emerging time, flight peak and comparing population, weekly sampling procedures was carried out in walnut orchards located in the uplands as well as plain areas of Qazvin. In each orchard, eight trees and in each tree seven leaves of different directions were randomly selected. The leaves carrying mummy aphids were collected and after counting were maintained in petri-dishes until the wasps emergence. Hyperparasites were ignored during counting and only member of T. pallidus were recorded. Results showed significant difference between populations in two areas using T-test method. The first aphids were observed in mid-April in lowland areas and in early-May for the mountains. Sampling continued until the end of October. The wasps passed the summer in diapauses phase. In late September the diapauses in some wasps in petri-dishes was broken but mostly remained in diapause. | ||
| Keywords | ||
| biology; Chromaphis juglandicola; natural enemies; Trioxys pallidus; walnut; walnut aphid | ||
| References | ||
|
رخشانی، م.، 1379. بررسی بیولوژی زنبور پارازیتوئید Trioxys pallidus. پایان نامه کارشناسی ارشد، دانشگاه تربیت مدرس، 50 ص. Alford, D. V., 1984. A colour atlas of fruit pests. Wolfe publishing, London, 320 p. Barnes, M. M., 1987. Integrated pest management for walnuts. Division of Agriculture and natural Resources, University of California, 96 p. Dbach, P., 1974. Biological control by natural enemies. Cambridge University Press, 323 p. Hagan, K. S., and Vanden Bosch, R., 1968. Impact of pathogens, parasitoids and predators on aphids. Annual review of entomology, 13: 329-384. | ||
|
Statistics Article View: 675 PDF Download: 501 |
||
Journal management system. designed by sinaweb