Patogenity test of two isolates of ganoderma on sengon seedings

Abstract

Sengon tree (Paraserianthes falcataria (L.) Nielsen) currently becomes a major forest tree species widely planted by smallholders in Indonesia. Sengon often used by farmers as component planted in agroforestry system as well as shade trees planted in between other crops such as coffee and cacao. Ganoderma infection causebasal stem rot disease which is becoming more prevalent and causing significant loss in sengon tree and other estate crops. This research is based on the attack of Ganoderma tothe shade tree, sengon. Therefore, it is important to do a specific research on the process of the inoculation of Ganoderma to prevent such attack. The aim of this research is to understand the effect of the inoculation to the sengon seedlings. There are two majors in the research i.e. non inoculation and inoculation treatments. Each treatment consisted of three observation blocks that are considered equal and each block consisted of four plants (the sengon seedlings age were one and a half months) as replicates. The non inoculation treatments were all combinations of root and foodbase treatments. Foodbase treatment itself is divided into two i.e. the sengon wood piece with varying size (3, 4, and 5 cm diameters) and PDA (Potato Dextrose Agar) without inoculation of Ganoderma spp. from Ciamis area/region (isolates of Ganoderma from lamtoro) and isolates of Ganoderma from sengon plants) derived from the collection of Forest Pathology Laboratory and will be called SP1 and SP2. The result showed that the control has a better average growth compared to the inoculation treatment. The f pathogenity test shows that Ganoderma SP2 has more pathogenic than Ganoderma SP1. the heights of seedlings that were inoculated with Ganoderma SP2 are l lower than the heights of seedlingss that were inoculated with Ganoderma SP1. Root treatments application showed that both controls and treatments blocks have better growth from sengon seedlings using root cutting treatment. The effect on the growth of sengon seedlings showed that inoculated seedlings in the wood with 3 centimeters diameter as a foodbase inhibit both their height and leaves growth compared to the seedlings with 4 centimeters or 5 centimeters diameter of wood of the same foodbase.