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Population changes of Trioxys pallidus, a parasitoid of walnut aphid in Qazvin province



Population changes of Trioxys pallidus, a parasitoid of walnut aphid in Qazvin province



Iranian Journal of Forest and Range Protection Research 3(1): 23-30, 98



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.

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