Nguyen Dac Khoa , Tran Viet Quyen * and Chau Hoang Trung Tin

* Corresponding author (

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Fusarium basal rot caused by Fusarium oxysporum is one of the most important diseases of shallot (Allium cepa var. ascalonicum). This study aims at isolating soil bacteria from Vinh Chau (Soc Trang) and testing for their antagonistic and disease-reducing effects which could be used for biological control of the disease. A number of 224 isolates were collected and tested for their antagonistic effects on mycelial growth and conidia germination of the pathogen. Among those, three isolates exhibited the strongest effects. These isolates were tested for their disease-reducing effects under greenhouse conditions using two application methods, i.e., bulb coating and soil drenching. Two treatments using ATB-24 and ATA-33 (108 CFU/mL) showed the highest effects on disease incidence and severity; their effects remained through all assessment time points (until 65 days after planting). The results suggest the applicability of the ATB-24 and ATA-33 isolates as biological control agents for Fusarium basal rot of shallot.
Keywords: Allium cepa var. ascalonicum, antagonistic bacteria, Fusarium basal rot, Fusarium oxysporum, shallot

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