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| Antifungal Effects of Seven Biological Fungicides Against the Pathogen Causing Stem Rot Disease in Passion Fruits |
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| DOI：10.16768/j.issn.1004-874X.2022.10.012 |
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| Abstract: |
| 【Objective】In order to screen safe and effective fungicides to provide guidance for passion fruit
production, seven biological fungicides were used as materials to study their control effects on the pathogen causing stem rot
disease in passion fruits.【Method】Seven botanical and microbiological fungicides were used to determine their toxicity
effects on the pathogen causing stem rot disease in passion fruits by mycelium growth rate method, the effects of fungicides
on mycelium growth and spore morphology were observed, and their control effects were tested by in vivo inoculation method.
【Result】All the selected fungicides showed inhibition effects on mycelium growth but had different effects on spore growth
and morphology. Based on the indoor toxicity test results, among the botanical fungicides, Jinggangmycin showed the best inhibition effect with an EC50 of 7.79 mg/L, followed by Chunleimycin, ethylallicin and matrine, with the EC50 of 26.35 mg/L,
28.65 mg/L and 339.13 mg/L, respectively. Polyxins showed the lowest effect with an EC50 of 1 150.29 mg/L. Microbiological
fungicide of Bacillus subtilis showed better effect than Trichoderma harzianum, with an EC50 of 3.2×106
CFU/g. The four
screened fungicides of Jinggangmycin, Chunleimycin, ethylallicin and B. subtilis showed antifungal effects on different strains of
fusarium pathogen. The in vivo inoculation test and field test showed that Jinggangmycin and B. subtilis had remarkable control
effects on the pathogen causing stem rot disease in passion fruits, with in vivo inoculation control efficacy of 58.8% and 70.6%,
respectively, and field control efficacy of 53.7% and 61.3%, respectively.【Conclusion】Two biological fungicides of B. subtilis
and Jinggangmycin were screened out for their optimal control effects on the stem rot disease in passion fruits. It can provide
alternatives or effective supplements for chemical fungicides for the control of stem rot disease, which could be promoted and
applied. |
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