بررسی و شناسایی عوامل پوسیدگی ریشه و طوقه درختان سیب سمیرم

To determine the pathogens causing crown and root rot of apple trees in Samirom, some fungus speciments were collected, during two agriclilwral Seasonsof 2005-6from apple gardens in Vardasht(Moruk,Mehrgercl,Dollat Gharin and Kezen),Samirom , Hanna and Padena(Kahangan and Bideh), different parts of Samirom in Esfahan province.For this purpose, rottcd and brownish parts of the foot and crown after sterilization with commercial sodium hypocholorite(2%)for 2-3 minutes were cultured on common,sclective and semi selective media,resulting to 112 fungi isolates.3 isolates wcre selected at random of each specious, pathogenicity test and identification were carried out.The results showed that,among all pathogens,Dema/o!J/uJI'a necatrix,Armilaria mellea,Phytophthora cae/orum and P. nicoliana with 32,15,9 and 7 abundance rate respectively, were the causal agent decli'lc and death of apple trees in Samirom area, while, Fusarium solani and Rhizoctonia solani with 37 and 12 abundance were associated the other pathogens On apple trees with decline, crown and root rot symptoms.

Keywords:

سیب ها , درختان میوه , پوسیدگی های ریشه , بیماری زاها , قارچ ها , سمیرم