Acta Agriculturae Zhejiangensis ›› 2025, Vol. 37 ›› Issue (2): 417-425.DOI: 10.3969/j.issn.1004-1524.20240138

• Plant Protection • Previous Articles     Next Articles

Identification and fungicide sensitivity of the pathogen causing root rot on strawberry

SHEN Lan1(), YANG Xiaofang2, ZHANG Guofang1,*()   

  1. 1. Ningbo Key Laboratory of Characteristic Horticultural Crops in Quality Adjustment and Resistance Breeding, Institute of Biotechnology, Ningbo Academy of Agricultural Sciences, Ningbo 315040, Zhejiang, China
    2. Institute of Horticulture, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
  • Received:2024-02-06 Online:2025-02-25 Published:2025-03-20
  • Contact: ZHANG Guofang

Abstract:

Root rot is one of the most serious diseases on strawberry. To identify the pathogen causing root rot on strawberry in Ningbo, Zhejiang, China, diseased crown and rot were collected, and the pathogen was obtained by the tissue method and pathogenicity test. The pathogen was further identified by the morphological observation, ITS and TEF1-α sequence analysis and phylogenetic trees. Meanwhile, the toxicity of seven fungicides (prochloraz, pyraclostrobin, bromothalonil, prochloraz, azoxystrobin, tebuconazole, fluazinam) against this pathogen was determined in vitro. It was shown that the pathogen causing crown and root rot on strawberry in Ningbo was identified as Macrophomina phaseolina, which could also cause the leaf and petiole withered. Laboratory toxicity tests of 7 fungicides showed that fluazinam, tebuconazole, imazalil, prochloraz were the most virulent fungicides with median effective concentration (EC50) of 0.000 178, 0.568, 0.959, 1.179 μg·mL-1, respectively. To our knowledge, this is the first report of M. phaseolina causing root rot on strawberry in Zhejiang, China. Fluazinam, tebuconazole, imazalil, prochloraz are potential fungicides for the control of this disease caused by M. phaseolina on strawberry.

Key words: strawberry, root rot, Macrophomina phaseolina, laboratory toxicity determination

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