However, these chemical fungicides are known to be hazardous to farmers’ and consumers’ health, and environment ( Lo, 2010 Yang, 2011). Chemical fungicides are commonly used for the control of fungal pathogens. Other diseases that may pose a serious problem in muskmelons are anthracnose, powdery mildew, downy mildew, and necrotic spot virus ( Kishi, 1966 Kristkova et al., 2009). melonis, are important diseases associated with muskmelons and have been known to cause significant losses in yield and quality of this fruit ( Gomez and Tello, 2000 Perchepied and Pitrat, 2004 Li et al., 2015 Garampalli et al., 2016). Gummy stem blight disease caused by Stagonosporopsis cucurbitacearum (synonym = Phoma cucurbitacearum and Didymella bryoniae), and wilt caused by Fusarium oxysporum f. Fungi in the genera Alternaria, Colletotrichum, Cladosporium, Fusarium, Penicillium, Phytophthora, and Stagonosporopsis have been reported to cause a range of leaf, fruit, stem, and/or root diseases in muskmelons ( Li et al., 2015 Garampalli et al., 2016 Ghuffar et al., 2018). Plant pathogenic microorganisms (bacteria, fungi, and viruses) are known to cause diseases in muskmelons under the field before they are harvested, during harvesting and during storage, all of which can cause considerable yield loses ( Walcott et al., 2004 Malik et al., 2010 Kehinde, 2013). On the other hand, the incidence and severity of certain diseases have also increased when plantings occur at unsuitable locations. Nowadays, muskmelon production is an important economic activity in Thailand and the production area continues to increase. Indonesia is the Southeast Asia’s leading melon producer, followed by the Lao People’s Democratic Republic and the Philippines. In 2018, the largest producer of melons (including muskmelons and cantaloupes) is produced in China at 1.27 million tonnes with global production at 2.73 million tonnes ( FAOSTAT, 2020). This fruit is rich in nutrients, minerals, and several other health-bioactive compounds that are beneficial to humans ( Ismail et al., 2010 Parle and Singh, 2011). Muskmelon ( Cucumis melo L.) is one of the most popular edible fruits in the world. phayaoense was able to tolerate a commonly applied fungicide (metalaxyl) in recommended dosages for field applications. phayaoense could effectively increase weight, diameter, and the circumference and total soluble solid of fruit without having a negative effect on fruit quality parameters. phayaoense was also effective in improving plant development by increasing plant height, as well as shoot and root dry weight values. cucurbitacearum, which could then reduce the impact on the disease severity index. phayaoense could be used preventively in muskmelon seedlings that were inoculated with F. However, no disease symptoms were observed in seedlings inoculated with T. cucurbitacearum were the cause of gummy stem blight and wilt disease in muskmelon seedlings, respectively. Morphological and multilocus phylogenetic analyses revealed that the isolate UP-L1I3 was a new species that has been described herein as Trichoderma phayaoense. Consequently, this isolate was selected for its potential ability to promote plant growth and control gummy stem blight and wilt in muskmelon seedlings. cucurbitacearum at 90.80 and 81.60%, respectively. The results indicated that a fungal isolate UP-L1I3 displayed the highest percentage in terms of inhibition of the mycelial growth of F. Twenty-one fungal isolates were obtained. In this study, the potential of endophytic fungi isolated from leaves of Siam weed ( Chromolaena odorata) was investigated for the inhibition of mycelial growth of Stagonosporopsis cucurbitacearum and Fusarium equiseti. Gummy stem blight and wilt are known to cause enormous losses to the global production of muskmelon ( Cucumis melo). 4Academy of Science, The Royal Society of Thailand, Bangkok, Thailand.3Research Center of Microbial Diversity and Sustainable Utilization, Chiang Mai University, Chiang Mai, Thailand.2Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai, Thailand. ![]() 1Faculty of Agriculture and Natural Resources, University of Phayao, Muang Phayao, Thailand.Wipornpan Nuangmek 1 Worawoot Aiduang 2 Jaturong Kumla 2,3 Saisamorn Lumyong 2,3,4 Nakarin Suwannarach 2,3 *
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