Efficacy of fungicides for controlling anthracnose disease on durian flowers caused by Colletotrichum gloeosporioides (CGD 5)

Authors

  • Titi Thongkamngam Faculty of Agro-industrial Technology, Rajamangala University of Technology Tawan-ok, Chanthaburi campus, Chanthaburi Province
  • Pairat Amloy Faculty of Agro-industrial Technology, Rajamangala University of Technology Tawan-ok, Chanthaburi campus, Chanthaburi Province
  • Therachot Boonkhum Faculty of Agro-industrial Technology, Rajamangala University of Technology Tawan-ok, Chanthaburi campus, Chanthaburi Province
  • Sukritta Anutrakunchai Faculty of Agro-industrial Technology, Rajamangala University of Technology Tawan-ok, Chanthaburi campus, Chanthaburi Province

Keywords:

Fungicides, Anthracnose disease, Colletotrichum gloeosporioides, Durian flowers

Abstract

Anthracnose disease in durian flowers has severely harmed farmers. The disease can cause durian flowers to dry out and fall off, leading to a direct impact on durian production. Therefore, it is essential to find preventive measures that can help reduce the problem of anthracnose disease in durian flowers. This research aimed to study the effectiveness of five types of fungicides: Carbendazim, Prochloraz, Hymexazol, Pyraclostrobin, and Difenoconazole + Azoxystrobin; in controlling anthracnose disease in durian flowers caused by the fungus Colletotrichum gloeosporioides. The fungal pathogen was first isolated from durian flower that showed the symptoms of the disease. After isolating the fungus and conducting molecular classification, it was identified as the fungus C. gloeosporioides, with five isolates namely: CGD1, CGD2, CGD3, CGD4, and CGD5. These were then tested for pathogenicity on durian flowers at two stages: the "bracelet" stage and the "yellow flower" stage. Results indicated that the CGD5 isolate caused the most severe disease, with an infection rate of 100%. Subsequently, tests were conducted with five types of fungicides using the agar well diffusion method. It was found that two fungicides, Carbendazim and Prochloraz, effectively controlled the C. gloeosporioides, inhibiting the growth of the pathogen by approximately 75-80%. When the pathogen treated with Prochloraz was observed under the microscope, abnormalities in the fungal hyphae of C. gloeosporioides (CGD5) were noted, showing swelling, expansion, and distortion. In conclusion, the experiment determined that Carbendazim and Prochloraz are the most suitable fungicides for controlling anthracnose disease in durian flowers.

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Published

2025-08-29

How to Cite

Thongkamngam, T. ., Amloy, P., Boonkhum, T., & Anutrakunchai, S. . (2025). Efficacy of fungicides for controlling anthracnose disease on durian flowers caused by Colletotrichum gloeosporioides (CGD 5). Agriculture & Technology RMUTI Journal, 6(2), 75–85. retrieved from https://li01.tci-thaijo.org/index.php/atj/article/view/263853

Issue

Vol. 6 No. 2 (2025): Agriculture & Technology RMUTI Journal

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