بررسی جمع آوری و شناسایی پارازیتوییدها و پرداتورهای ملخ کوهان دار تاغ و تعیین پارازیتیسم و شکارگری دشمنان طبیعی در تاغزارهای استان خراسان رضوی

One of the important trees in Khorasan Razavi is Haloxylon persicum . Dericorys albidula is one of the important key pest in Haloxylon persicum of the province. This insect appeared as pest and made high damage to trees. The nymphs attacked the trees leaves and caused seriously injuries Preliminary investigation on biology of this pest on Haloxylon persicum was studied from beginning 2006 with regular visit in one area in Sardagh located in Bejestan town. In each visit , developing steps of the insects , including adult , egg and nymphs instars were recorded. The oviposition time as well as its manner and location were determined observationally According to the results of this study , this insect has one generation per year and eggs are laid in the soil in beginnings July. Eggs set to number 15-28 in oothecae. Eggs remain 8-9 months in the soil in spring (in beginnigs April ) the nymphs were emerged and began their activity. The next nymphal stage were observed to color citrine-yellow in late April to the late May. The final nymphal stage were changed to adult from late May. This insecta were paired in the first June. This grasshopper is monophagous pest that did not observed to feeding on different species trees in the area. According to the results of this study,there were many factors of natural control this pest Dericorys albidula in Gonabad area, including a kind of the Rodents namely Meriones libycus attacking eggs of the pest. Some species of birds were the predator of the pest, including Corvus frugilegus, Coracias garrulus, There were some predators Insect including families Sphecidae, Carabidae, Meloidae feeding different stages of the pest development.