Abstract:
White root disease (JAP) is an important disease that attacks on rubber plants
caused by the Rigodoporus lignosus on the roots of rubber plants which can cause
leaves to turn yellow, fall, and the stems to dry and decay and even die on plants.
Disease control using biologl agents in the form of antagonist Trichoderma virens
has the potential to prevent or suppress the development of JAP disease in rubber
plant seeds. This research was conducted in April to July 2019 at the Pathology,
Entomology, Microbiology Laboratory of the Faculty of Agriculture and Animal
Husbandry, Sultan Syarif Kasim Riau Islamic University. The experiment used a
non factorial complete randomized design (RAL) of six treatments and five
replications in which Trichoderma virens was applied 7 days before the pathogen
infection, while the treatments were 0 g, 25 g, 50 g, 75 g, 100 g, and 125 g. The
results showed that the concentration of Trichoderma virens was effective in
suppressing the Rigodoporus lignosus attack at a dose of 125 g by 100% in rubber
plant nurseries and was able to increase the percentage of plant height increase by
35.39%.
