First report of pestalotioid fungus Truncatella angustata isolated from the infected leaf of rubber plant with leaves fall disease, and its inhibition by Trichoderma spp. in vitro

Abstract

Rubber, a global industrial commodity, continues to increase in demand on the world market. However, the rubber industry faces significant challenges due to pathogen attacks, particularly in the roots and leaves of the rubber tree, leading to reduced productivity and affecting the supply of raw rubber materials. Several types of pathogenic fungi have been studied as causes of disease in rubber plants. This research presents the first report of pestalotioid fungus Truncatella angustata causing leaf fall disease on rubber plants in Indonesia and the inhibition of the fungus by Trichoderma spp. in vitro. In this study, T. angustata was isolated from symptomatic leaves suspected of leaf fall disease on rubber plantations in Jambi Province, Indonesia. This research also investigated the characteristics and mechanisms of inhibition of T. angustata by Trichoderma asperellum isolated from soil at the exact rubber plantation location. As a comparison, Trichoderma koningiopsis from our laboratory collection was used. The investigation results show that the inhibition mechanism is through entanglement. Hence, T. asperellum showed an inhibitory ability of 76.61 %, while T. koningiopsis showed 59.65 %.

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