SPOT DISEASE OF Dalbergia tonkinensis Prain IN DAK LAK PROVINCE
DOI:
https://doi.org/10.70169/VJFS.1189Keywords:
Dalbergia tonkinensis, Diaporthe cf. eugeniae, spot disease, plant diseaseAbstract
Dalbergia tonkinensis Prain is distributed in Vietnam. It has high economic value and is easy to cultivate and maintain; therefore, it has been widely planted by local people in many provinces of Vietnam in recent years. However, spots disease has recently been observed on D. tonkinensis trees at several planting sites in Dak Lak province, and the causal agent has not yet been clearly identified. This study aimed to describe the symptoms and determine the cause of spots disease on D. tonkinensis. The results showed that disease symptoms appeared on both leaves and fruits as circular brown spots. Lesions on leaves were approximately 2 - 4 mm in diameter, while lesions on fruits were about 6 - 8 mm. The disease caused leaf perforation and could lead to leaf and fruit drop when the disease is severe. Based on fungal isolation, artificial inoculation on seedlings and ITS sequence analysis, the causal agent of spots disease on D. tonkinensis in Dak Lak was preliminarily identified as Diaporthe cf. eugeniae. Pathogenicity tests on seedlings showed that, among the isolated strains tested, only strain NA1 produced leaf spot symptoms similar to those observed under natural infection. Effective disease management strategies need to be developed during the cultivation and conservation of this threatened tree species.
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