تأثیر میزبان‌های مختلف بر صفات بیولوژیکی Scolytus multistriatus (Coleoptera: Scolytidae) روی درختان نارون در فضای سبز شهر تهران

Scolytus multistriatus (Marsham) (Coleoptera: Scolytidae), the smaller European elm bark beetle, cause economic damage to elm trees by feeding on the phloem, disrupting the flow of plant sap and transferring fungi. This beetle acts as vector of the Dutch elm disease, caused by the Ascomycota Ophiostoma ulmi, it is much less effective than the large elm bark beetle, S. scolytus. By understanding the effect of different hosts on the biological traits of this pest, we are able to provide an important tool in pest management decisions. In this research, four infested areas were considered and 5 trees were randomly selected in each area. The elm hosts included Ulmus minor, Ulmus umbraculifera and Ulmus carpinifolia in spring and summer. All the selected trees were between 28-30 cm in diameter. Every two weeks, two 10x10 cm samples from up to a height of 2 meters from the ground of each tree were randomly selected and observations were recorded. The studied biological traits included the length of the premature period, the percentage of deaths of the three larval stages, the number of eggs laid by females. The data was analyzed using Tukey's test by SPSS.V21 software. The results of analysis of variance showed that there is a significant difference between the treatments (P < 0.0001, df = 3).The results showed that the number of eggs laid by female elm leaf-eating beetles was significantly higher on Ulmus minor. The percentage of deaths of the three larval stages was lower on Ulmus minor, Ulmus carpinifolia and Ulmus umbraculifera resapectively. The length of the premature period was significanty longer on Ulmus umbraculifera.