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Postharvest fungicide dips to control fruit rot of ‘Monthong’ durian (Durio zibethinus)


Fruit rot diseases are the serious problem in durian production for domestic consumption and export. Fungicides are commonly applied to reduce postharvest loss caused by postharvest diseases. The objective of this research was to study the efficacy of fungicides for controlling durian fruit rot diseases. Diseased durian cv. ‘Monthong’ were collected from three orchards from Tha Mai district, Chanthaburi province. Fungi were then isolated by tissue transplanting method and identified based on morphological characteristics. Three fungi including Fusarium solani, Lasiodiplodia theobromae, and Phomopsis sp. were confirmed as causal agents of fruit rot on durian. Ten concentrations of two ready-mix fungicides, which were Bumper P® (prochloraz 40% + propiconazole 9% W/V EC) and Custodia® (azoxystrobin 12% + tebuconazole 20% W/V SC), were evaluated towards the inhibition of the fungal growths. From in vitro experiment, both treatments could inhibit the mycelial growth at different levels. The EC50 of Bumber P® and Custodia® were 9.7–49.11 and 7.93–196.73 mg L−1 and respectively. In vivo experiments by dipping fruits showed that Bumper P® and/or Custodia® at the minimum rate of 1 ml L−1 exhibited strong control durian fruit rot caused by F. solani and Phomopsis sp., but both fungicide mixtures could not control L. theobromae. The results of residue analysis illustrated that no residues were detected in the edible pulp. This is important to ensure that the treated durian is safe for consumptions and these fungicides are suitable for the postharvest application in durian.

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The authors gratefully acknowledge the financial support of Adama Agricultural Solutions Ltd., Kasetsart University Research and Development Institute (KURDI) Bangkok, Thailand and Dr. Wiphawee Leesutthiphonchai, Department of Plant Pathology, Kasetsart University for academic English editor.

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Correspondence to Netnapis Khewkhom.

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All authors consent to the submission of this manuscript. The manuscript has been prepared following principles of ethical and professional conduct. The research did not involve human participants and did not involve animal subjects therefore neither submission of human consent nor statement on welfare of animals is applicable.

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Piasai, R., Chalmers, P., Piasai, O. et al. Postharvest fungicide dips to control fruit rot of ‘Monthong’ durian (Durio zibethinus). Eur J Plant Pathol 160, 325–336 (2021).

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  • Durian
  • Fruit rot
  • Postharvest
  • Fungicide dipping
  • Residue analysis