摘要：The Rosa spp. (Rosa canina and Rosa domescana) used since the earliest times in rituals, cosmetics, perfumes, medicines, aromatherapy, landscape design and repair work are the important economic crop. The rose stem saw^y (Syrista par-reyssii (Spinola, 1843)) is one of the most important pests of R. canina, R. damascena. The larvae of S. parreyssii bore galleries in and feed on the core sections of the shoots so these shoots completely dry out after a certain time. Because of living in shoot, biological control of this pest is very difficult and important. Besides, recently, biological control of pests are getting more prevalent due to the effects of chemical residues. The present study was carried out to determine insectisidal effect of the entomopatho-gen fungi Beauveria bassiana (Bal.) Vuillemin against S. parreyssii.The insectisidal effect tests were carried out different conidial suspensions (106, 107 and 108 co-nidia/ml) of B. bassiana (ET 10) on laboratory conditions. The effect of these concentrations was observed larvae of S. parreyssii. The results of this study showed that all of the concentrations showed remarkable insectisidal effect against this insect larvae. Consequently, these fungal suspensions can be used as new biocontrol agents in controlling S. par-reyssii.
