Dose range of Trichoderma pellets on suppressing Synchytrium pogostemonis caused budok disease in patchouli plants

Budok disease is a condition that often attacks patchouli plants, and can cause warts on leaves, swollen and thickened stems; and makes reddish-purple leaves look wrinkled and thick. Pesticides are typically the best solutions for disease control. Alternative treatments that can be used to treat this condition are biological control agents such as Trichoderma fungi. This fungus has been produced in pellet form and has been evaluated for its potential to control several important plant diseases. Three-week-old Patchouli seedlings were grown on polibag (5 kg). Application of the pellets were carried out by immersing it in the planting medium according to the dosage range tested. The doses tested were 0 g, 2.5 g, 5 g, 7.5 g and 10 g per polybag. The transmission of S. pogostemonis sap was done by using a mechanical method. The measurements of incubation period, leaf area and disease intensity were conducted at 120 days after planting. The result showed that Trichoderma pellets could suppress the development of S. pogostemonis in patchouli plants. When the dose was raised to 10 g, symptoms of budok disease appeared such as warts on leaves, wrinkled and thick leaves with purplish red colour, which eventually led to leaf malformation.