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Paper Information

Journal:   JOURNAL OF AGRICULTURAL SCIENCE (UNIVERSITY OF TABRIZ)   2003 , Volume 13 , Number 3; Page(s) 1 To 14.
 
Paper: 

ETIOLOGY OF OAK (QUERCUS MACRANTHERA) DECLINE IN HATAM-BAIG FOREST OF MESHKINSHAHR AREA

 
 
Author(s):  DAVARI M.*, PAYGHAMI E., JAVANSHIR A., EBRAHIMI T.
 
* 
 
Abstract: 
Oak trees (Quercus macranthera) in Hatam Baig forest are being faced with declining and extinction. So far, about one third of the forest trees have been lost. In order to identify factors causing the decline, observations were made from 1999 to 2001. Various symptoms such as wilting, defoliation and decline were obsderved. Samples from roots, trunks, crowns and soil beneath the canopy were taken and cultured on different culture media. The fungi such as Armillaria mellea, Phytophthora cryptogea, Dematophora sp., Pythium aphanidermatum and Fusarium spp. were isolated. Considering the characteristics of the isolated fungi and according to the studies made on oak decline around the world and based on brown rot observed beneath mycelial fans in the cross sections prepared from the trunk, A. mellea appeared to be the essential causal agent of the decline. The physiological weakness and stresses in oak rootstocks caused by brown- tail moth and drought stress in the infected trees fovored the fangus activity. The biological species of this fungus was identified as Armillaria mellea (Vahl: fr) Kumm using hybridization tests and application of haploid test strains. The decline in Q. macranthera is reported as matrix nova. The report of the mentioned fungi isolated from the oak species is also universally new.
 
Keyword(s):  ARMILLARIA MELLEA, DECLINE, HATAM BAIG FOREST, OAK.
 
References: 
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