Abstract
This study aims to isolate and identify the fungal pathogen responsible for gummosis disease affecting Thanh Tra pomelo in Vietnam. Through molecular identification utilizing primer pairs ITS5 and ITS4, the analysis pinpointed <i>Lasiodiplodia theobromae</i> as the specific fungal pathogen. Notably, the fungal colonies exhibited vigorous growth on potato dextrose agar. Initially, these colonies appeared whitish-grey, transforming into a black-grey hue within 5–7 days at a temperature of 30<sup>o</sup>C. According to previous reports, <i>Phytophthora</i> spp. was the most common pathogenic genus causing gummosis on Thanh Tra pomelo in Vietnam. To our knowledge, this is the first report on <i>L. theobromae</i> causing gummosis on Thanh Tra pomelo in Vietnam.
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