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Application of Melaleuca cajuputi Powell crude extract on controlling postharvest anthracnose disease in Gross Michel banana (Musa (AAA group) ‘Kluai Hom Thong’)
(2026-03-01)
Montri, N.
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Leujantuak, P.
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Tongsri, V.
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Deewatthanawong, R.
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Bunya-Atichart, K.
Exporting Gross Michel bananas, known as ‘Kluai Hom Thong’ in Thailand, to Japan involves several considerations to ensure compliance with Japan’s stringent food safety and quality standards, especially regarding pesticide residues and other contaminants. The research aimed to evaluate the impact of various concentrations of Melaleuca cajuputi Powell crude extract on controlling postharvest anthracnose disease in Gross Michel bananas, focusing on developing a non-toxic production method. The 70% ripening stage bananas were dipped with 0, 800, 1,000, and 1,200 mg L-1 crude extract for 2 min before spraying with 10-6 spore mL-1 of Colletotrichum musae spore suspension, followed by a 2-day incubation, subsequent spraying with 500 mg L-1 of ethephon solution, and a further 1-day incubation at ambient temperature (29±2°C). The shelf-life of banana, weight loss, total soluble solids, and surface morphology of banana peel were analyzed. Results showed that applying M. cajuputi Powell crude extract could extend shelf-life and maintain the quality of banana fruits. The 800 mg L-1 crude extract resulted in 2.13% weight loss, with peel density at 14.80 N cm-3 and pulp density at 6.23 N cm-3. Additionally, it resulted in the lowest percentage of anthracnose disease at 7.5% and the longest shelf life of 8 days.
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Soil physico-chemical properties and microbial diversity on chilli anthracnose disease severity in Northern Karnataka, India
(2025-06-01)
Panigatti, Simran
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Thangadurai, Devarajan
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Sangeetha, Jeyabalan
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Hospet, Ravichandra
;
Yadav, Guggalada Govardhana
Chilli anthracnose disease causes a huge commercial loss in the globe. Studying soil physico-chemical properties is crucial to understand chilli anthracnose because these properties significantly affect the efficacy of biocontrol agents and herbicides used to manage the disease. This study aimed to evaluate the relative percentage of disease incidence (% DI) of chilli anthracnose in dominant chilli growing areas of Northern Karnataka in India and its relationship to soil properties. The soil physico-chemical (texture, moisture, density, pH, EC, OC, N, P, K, Ca, Mg, S, Zn, Cu, Fe, and B) properties, microbial (fungi and bacteria) diversity of 17 soil samples were analysed by standard protocols and evaluated their correlation with % DI, using Pearson correlation and cluster analysis method. Highest % DI was found in Shira with more value of pH (8.45), and Mg (14.63 meq 100 g-1), whereas in Nela with more value of EC (0.38%), moisture (46%), and Ca (33.83 meq 100 g-1), and also in the regions where the beneficial microbes were less in number (Tegg, Shira, Agad and Nela). The results obtained from Pearson correlation indicated that % DI was positively correlated to moisture (r=0.851**, P=0.01), EC (r=0.488*, P=0.05) and negatively correlated to Pseudomonas sp. (r=-0.322*, P=0.05). The present study provides comprehensive information about the role of physical, chemical and biological properties of soil characteristics responsible for the development of anthracnose disease prevalence and reducing soil quality as well as chilli production under natural conditions.
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Resistance to quinone-outside inhibitor (Qoi) fungicides in colletotrichum species isolated from anthracnose disease occurring in Thailand
(2020-01-01)
Kongtragoul, Pornprapa
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Imamoto, Kazuumi
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Ishii, Hideo
Colletotrichum species are plant pathogens causing anthracnose diseases in many crops that result in significant reduction of quality and quantity of the crop products. Management of these diseases has become increasingly difficult recently due to the development of fungicide resistance in pathogens. Thus, monitoring for fungicide sensitivity in the pathogen is important to manage these diseases. The isolates of Colletotrichum species were isolated from anthracnose disease on various crops collected during 2016-2017 in central and southern Thailand. They were tested for their mycelium growth sensitivity to azoxystrobin, a quinone-outside inhibitor (QoI) fungicide and their internal transcribed spacer (ITS) and 5.8S regions of rDNA were analyzed. The results showed that eleven out of twenty four isolates of Colletotrichum species were resistant to azoxystrobin. They were able to grow on PDA amended with 100 mg/l azoxystrobin in the presence of salicylhydroxamic acid (SHAM) at 100 mg/l. Moreover, two isolates of azoxystrobin-resistant Colletotrichum spp. produced much larger lesions than azoxystrobin-sensitive isolates on mango fruits after treatment with 100 mg/l azoxystrobin. This is the first report on the occurrence of azoxystrobin resistance in Colletotrichum species present in Thailand and will contribute to the management of these important diseases in the future.
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