FIRST REPORT OF Diaporthe phaseolorum AND Neopestalotiopsis clavispora CAUSING LEAF SPOT DISEASE ON OIL PALM (Elaeis guineensis)
DOI: https://doi.org/10.21894/jopr.2026.0010
Received: 23 November 2024 Accepted: 13 October 2025 Published Online: 3 February 2026
Oil palm is a significant agricultural crop, highly valued for its role in oil production. This study identified two fungal pathogens, Diaporthe phaseolorum and Neopestalotiopsis clavispora, as causal agents of leaf spot disease in oil palm (Elaeis guineensis), marking their first reported occurrence. Over 85% of surveyed trees in Pahang, Malaysia, were affected, posing a significant threat to oil palm productivity. Morphological, pathogenicity and molecular analyses confirmed their roles, with Lasiodiplodia theobromae causing the most severe lesions. These findings underscore the importance of early detection and targeted management to mitigate economic losses.
KEYWORDS:1 Department of Biology,
Faculty of Science, Universiti Putra Malaysia,
43400 Serdang, Selangor, Malaysia.
2 Laboratory of Sustainable Agronomy and Crop Protection,
Institute of Plantation Studies,
Universiti Putra Malaysia,
43400 Serdang, Selangor, Malaysia.
3 Department of Biological Sciences,
Sule Lamido University,
Kafin Hausa, P.M.B. 048, Jigawa State, Nigeria.
* Corresponding author e-mail: ainizzati@upm.edu.my