Efficiency of 3 Fungicides (Prochloraz, Cyproconazole, and Pyraclostrobin) for Controlling Lasiodiplodia theobromae Causing Fruit Rot in Durian
DOI:
https://doi.org/10.57260/stc.2026.1132Keywords:
Prochloraz, Cyproconazole, Pyraclostrobin, Fruit rot, Lasiodiplodia theobromaeAbstract
Durian fruit rot disease has caused severe economic losses to farmers, leading to premature fruit drop and decrease fruit yields. Effective measures are essential for preventing and controlling this disease. This study aims to evaluate the efficacy of three fungicides—prochloraz, cyproconazole, and pyraclostrobin—against Lasiodiplodia theobromae, the causal agent of durian fruit rot. The study began with the isolation of the pathogen from symptomatic durian fruits. Molecular identification confirmed the presence of L. theobromae, with three isolates identified: LT-1, LT-5, and LT-10. Pathogenicity tests conducted on 70-day-old pruned young durian fruits revealed that the LT-10 isolate caused the most severe infection, reaching 100% disease incidence. To assess fungicidal efficacy, the poisoned food technique was employed at five concentration levels (0, 10, 100, 500, and 1000 mg/L). The results demonstrated that prochloraz effectively controlled LT-10 at all tested concentrations. At 10 mg/L and above, fungal growth inhibition ranged from approximately 75% to 100%. A dipping test was subsequently conducted on durian fruits using three fungicides—prochloraz, cyproconazole, and pyraclostrobin—each applied at a rate of 100 g per 100 L of water. Among them, prochloraz exhibited the highest efficacy, achieving an 80% fungal growth inhibition rate, followed by cyproconazole and pyraclostrobin. Dissection of treated durian fruits revealed no LT-10 infection in the fruit pulp across all treatments. In conclusion, the results of this study demonstrated that prochloraz at concentrations of 10, 100, 500, and 1,000 mg/L effectively inhibited the fungal pathogens causing durian fruit rot under laboratory conditions. However, further studies under field conditions are required to evaluate its efficacy, suitability, and safety before practical application in commercial durian orchards.
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