https://scholar.dlu.edu.vn/handle/123456789/148 Sat, 18 Apr 2026 22:11:26 GMT 2026-04-18T22:11:26Z https://scholar.dlu.edu.vn/handle/123456789/6285 Title: New insights into the diversity and pathogenicity of Fusarium species causing carnation wilt in Lam Dong, Vietnam Authors: Lê, Dũng Abstract: Carnation Fusarium wilt (CFW) is a devastating systemic disease affecting carnation production worldwide, although little is known about its status in Vietnam. This study provides the first comprehensive report on the population and pathogenesis profile of Fusarium species associated with CFW in Vietnam. A survey of commercial greenhouses revealed approximately 10.7% disease incidence, with symptomatic plants showing chlorosis, wilting, leaf blight, and vascular discoloration. Twenty-one Fusarium isolates were obtained and classified into the Fusarium oxysporum species complex (FOSC) and F. incarnatum-equiseti species complex (FIESC), each comprising two morphologically distinct clades. Molecular identification based on ITS and TEF-1α sequences confirmed four species: F. oxysporum (42.9%), F. pernambucanum (33.3%), F. sulawesiense (19.0%), and F. nirenbergiae (4.8%), revealing notable species diversity. Pathogenicity tests at both seed germination and transplant stages showed that all identified species could cause disease, with varying degrees of aggressiveness. Fusarium oxysporum species complex isolates mainly delayed germination, while FIESC isolates more strongly reduced germination rates. Both complexes caused root rot, seedling death, and foliar symptoms in transplants. Two highly virulent isolates, C1611 (F. oxysporum) and C2111 (F. pernambucanum), significantly reduced seed viability and survival and caused high disease intensity. Some isolates showed organ- or stage-specific pathogenicity. This is the first report of F. pernambucanum, F. sulawesiense, and F. nirenbergiae associated with carnation, globally, and the first record of CFW-associated species in Vietnam. These findings highlight the diversity and pathogenic complexity of Fusarium species involved in CFW and underscore the need for accurate identification and effective disease management strategies in local and international trade. Wed, 06 Aug 2025 00:00:00 GMT https://scholar.dlu.edu.vn/handle/123456789/6285 2025-08-06T00:00:00Z https://scholar.dlu.edu.vn/handle/123456789/6284 Title: Emergence of Colletotrichum nymphaeae in Vietnam: etiology and cultivar response to strawberry leaf anthracnose Authors: Lê, Dũng; An Thuy Bui; Huynh Duy Tran; Hoa Thi Kim Thuan Nguyen Abstract: Strawberry leaf anthracnose (SLA) is an emerging threat in Vietnam’s primary strawberry-growing region. This study investigated the occurrence, etiology, and cultivar susceptibility in Lam Dong Province. Field surveys across 27 farms in three wards of Da Lat City revealed necrotic leaf spots and stem reddening, with mean incidence reached 6.3% on leaves and 2.8% on petioles, and an average severity of 10.4%. SLA distribution varied by location, with higher leaf infection in ward 7 and greater petiole involvement in ward 3. Statistical analysis indicated that mulch use was associated with a significant increase in leaf disease severity, whereas other agronomic practices showed no consistent effect on SLA incidence. A total of 27 Colletotrichum isolates were recovered from symptomatic tissues, and 7 representative isolates were tested for pathogenicity on detached leaves, of which some produced symptoms, showing variable aggressiveness. Multilocus phylogenetic analysis of two representative isolates (C1P8 and C1P3) using ITS, TUB2, GAPDH, ACT, CHS-1, and HIS3 sequences identified the causal agent as Colletotrichum nymphaeae, representing the first report of this pathogen on strawberry in Vietnam. Screening of seven strawberry cultivars with the most aggressive isolate (C1P8) revealed significant differences in susceptibility: ‘Seolhyang’ and ‘Skyberry’ were highly resistant, whereas ‘Pajaro’ was the most susceptible. These findings highlight the combined roles of pathogen virulence and host genotype in SLA development and support the use of resistant cultivars for integrated disease management. This study contributes to regional pathogen surveillance efforts and supports phytosanitary measures against C. nymphaeae in Southeast Asian strawberry systems. Mon, 15 Dec 2025 00:00:00 GMT https://scholar.dlu.edu.vn/handle/123456789/6284 2025-12-15T00:00:00Z https://scholar.dlu.edu.vn/handle/123456789/6235 Title: Synthesized lemongrass oil-chitosan nanoemulsion coating for enhanced post-harvest preservation of bananas (Musa AAA) Authors: Quoc-Bao Vo-Van; Thanh-Tien Do; Bao Khanh Tran; Quoc Sinh Nguyen; Diem Huong Nguyen; Thanh Hai Dương; Thi Phuong Xuan Tran; Huy Van Nguyen; Đinh, Quảng Anh; Duc An Hoang Abstract: This study aimed to make and evaluate a lemongrass essential oil-chitosan (LEO-Chi) nanoemulsion (nano LEO-Chi) to use as an edible coating that can help keep bananas (Musa AAA) fresh for a longer time and maintain their quality post-harvest. The nanoemulsion created was stable and consistent, with droplets size averaging 178 ± 7.3 nm, a low polydispersity index (PDI) of 0.259 ± 0.021, and a high positive zeta potential of +25.22 mV. Furthermore, scanning electron microscopy visually confirmed the formation of near-spherical nanostructures (80–200 nm). Using nano LEO-Chi coatings at 75% and 100% concentrations significantly reduced weight loss and kept the bananas firm during the 36-day storage period. Moreover, these coatings slowed down ripening by effectively reducing the total acidity and the rise in total soluble solids and slowed down ethylene generation and inhibited breathing rates, therefore lengthening the pre-climacteric period and slowing down ripening. These findings highlight nano LEO-Chi as a sustainable, interesting edible coating for improving banana preservation and extending its marketable shelf life since they show the synergistic effects of the semi-permeable barrier developed by chitosan and the properties of lemongrass essential oil. Thu, 27 Nov 2025 00:00:00 GMT https://scholar.dlu.edu.vn/handle/123456789/6235 2025-11-27T00:00:00Z https://scholar.dlu.edu.vn/handle/123456789/6231 Title: Halophytic Community of Foredunes in South-Central Coast of Vietnam Authors: Hoàng, Thanh Trường; Lê, Bá Lê; Nguyễn, Văn Bình; Trương, Thị Lan Anh; Nguyễn, Khoa Trưởng; Trần, Thái Vinh; Nguyễn, Hoàng Nghĩa; Quách, Văn Hợi; Nguyễn, Văn Giang; Phan, Hoàng Đại; Lê, Thị Kim Ngân; Nguyễn, Thị Ái Minh; Trần, Văn Tiến Wed, 01 Jan 2025 00:00:00 GMT https://scholar.dlu.edu.vn/handle/123456789/6231 2025-01-01T00:00:00Z