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Acta Horticulturae Sinica ›› 2025, Vol. 52 ›› Issue (3): 737-748.doi: 10.16420/j.issn.0513-353x.2024-0337

• Plant Protection • Previous Articles     Next Articles

Identification and Biological Characteristics of the Pathogen Causing Persimmon Leaf Blight and Toxicity Test of Different Fungicides

WANG Jie1, DONG Xiaoxu1,2, CHEN Jinxiao1,3, YU Xianmei1, GAO Rui1, AI Chengxiang1,*(), SHEN Guangning1   

  1. 1 Shandong Institute of Pomology,Taian,Shandong 271000,China
    2 College of Life Sciences,Shandong Agricultural University,Taian,Shandong 271018,China
    3 College of Agronomy,Tarim University,Alar,Xinjiang 843300,China
  • Received:2024-06-25 Revised:2025-01-09 Online:2025-03-25 Published:2025-03-25
  • Contact: AI Chengxiang

Abstract:

To determine the primary pathogen responsible for persimmon leaf blight disease,leaves exhibiting typical symptoms of the blight were collected. The fungus was isolated and purified using the tissue separation method,and its pathogenicity was confirmed through Koch’s postulation. Based on morphological characteristics,ITS analysis,and the combined gene sequence phylogenetic analysis of TEF-CAL-HIS-TUB,the pathogen was identified as Diaporthe eres. The biological characteristics of the isolated D. eres strain DHB1 were investigated. The results showed that a culture medium containing glucose or maltose as the carbon source,along with yeast extract as the nitrogen source,significantly promoted rapid mycelium growth. The optimal conditions for mycelial growth were found to be a temperature of 28 ℃ and a pH of 6.0. In vitro toxicity tests were conducted to evaluate the effects of nine fungicides on the mycelial growth of D. eres DHB1. The results indicated that all tested fungicides had varying degrees of inhibitory effects. Among them,95% Fludioxonil had the strongest inhibitory effect with an EC50 value of 0.046 mg · L-1,followed by 95% Hexaconazole,80% Carbendazim WP and 97% Difenoconazole,with EC50 values of 0.217,0.224 and 0.705 mg · L-1,respectively.

Key words: Diospyros kaki, leaf blight, pathogen, Diaporthe, fungicide screening, multi-locus phylogeny