| armillaria mellea as a cause of oak decline in hatam-baigh forest of iran. | a200 ha forest of "hatam-baig" is located in ardebil province on the northwest of iran. oak trees (quercus macranthera fisch & mey) in this forest have been faced with declining and extinction since 1991, that has destructed about one third of the forest trees until now. this disorder was expressed in various symptoms including wilting, defoliation and decline. in order to identify factors causing decline, a study was managed from 1998 to 2001. samples were taken from roots, trunks, crowns and s ... | 2005 | 16637190 |