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.

水果腐烂病是榴莲生产供国内消费和出口的严重问题。杀菌剂通常用于减少收获后疾病引起的收获后损失。这项研究的目的是研究杀菌剂控制榴莲果实腐烂病的功效。有病的榴莲简历 “ Monthong”是从尖竹汶府塔迈地区的三个果园中收集的。然后通过组织移植方法分离真菌，并根据形态特征进行鉴定。三种真菌包括茄病镰刀菌，Lasiodiplodia theobromae，和拟茎点霉sp。被证实是榴莲上水果腐烂的病因。评估了十种浓度的两种预混杀菌剂，分别是BumperP®（丙草胺40％+丙环唑9％W / V EC）和Custodia®（天青霉素12％+ tebuconazole 20％W / V SC）的抑制作用。真菌的生长。从体外实验来看，两种处理均可以不同程度抑制菌丝生长。BumberP®和Custodia®的EC50分别为9.7–49.11和7.93–196.73 mg L ^-1。通过浸入水果进行的体内实验表明，BumperP®和/或Custodia®的最低添加量为1 ml L ^-1，表现出强烈的控制榴莲腐烂，该腐烂是由茄茄和拟南芥引起的。菌，但两种杀菌剂混合物均不能控制Theobromae。残留物分析的结果表明，在可食用的果肉中未检测到任何残留物。这对于确保经处理的榴莲安全食用是重要的，并且这些杀真菌剂适用于榴莲收获后的应用。