Pathogenicity of Ophiostomatoid Fungi Associated with Ips subelongatus
[Objective]The paper aims to investigate the harm degree and the potential risk of the ophiosto-matoid fungi associated with Ips subelongatus by analyzing their pathogenicity.[Method]Through the arti-ficial inoculation,12 species of ophiostomatoid fungi isolated from the body and tunnel of I.subelongatus were inoculated on Larix olgensis.After 60 days,the lesion sizes were observed and measured,and the host resistance responses were tested by inoculation of Endoconidiophora fujiensis and Endoconidio-phora laricicola on larch.[Result]The results showed that the area of lesions caused by E.laricicola,E.fujiensis,Ophiostoma hongxingense,Ophiostoma peniculi and Ophiostoma xinganense were larger than those of the control.The lesion areas produced by the other seven species of Ophiostoma showed no sig-nificant difference comparing with the control.The average lesion area produced by E.laricicola were the largest with 3.51±0.18 cm2,and the content of terpenoids in the host showed a trend of first increasing and then decreasing,showing a strong pathogenicity.However,the average lesion area of E.fujiensis was 1.70±0.08 cm2,and the content of host terpenoids showed a decreasing trend,exhibiting weak pathogeni-city.[Conclusion]E.laricicola is highly pathogenic to larch,E.fujiensis,O.hongxingense,O.peniculi and O.xinganense are weakly pathogenic,while the other seven Ophiostoma fungi show no obvious pathogen-icity.
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