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3 Abstract: In recent years, charcoal cankeraffecting the oak species (Quercus castaneifolia) in northern forests' and (Quercus persica) in Zagros forests' of Iran.This research investigated the population density of diseased trees and interaction across the severity of disease symptomatology onQ. Castaneifolia in the Quroq Park Hyrcanian Mixed Forests of Iran. We used two-dimensional spatial analysis tools with data gathered in point-centered-quarter format in 2013 to quantify the population density of diseased trees to examine the spatial pattern of tree mortality and investigated co-occurrence severity of disease symptoms using paired quadrat covariance analysis. Eventually, the percent of dead crown (total number of dead branches), depth, area and canker number in 400 trees were recorded in seven transects. Results showed that nearly 60 % of the oak trees in the park are diseased, as for the severity of disease oak trees with high probability 36% of oak trees recorded in this study offing death. Dead trees and high disease severity were strongly clustered at broader scales (800 m), trees with only a limited bleeding and signs of fungal activity Biscogniauxia mediterranea occurred in clusters away from dead trees. Crown mortality and Beetle-infested trees co-occurred with mortality were strongly correlated. These findings suggest that clustered spatial patterns of charcoal cancer can be important for the control and management of this disease in oak forests.

Spatial pattern and disease severity of charcoal canker in Hyrcanian forests, north of Iran