ANALYSIS OF CAUSATIVE FACTORS FOR STEM CANKER DISEASE EPIDEMIC ON RUBBER PLANTS IN SOUTH SUMATRA

Abstract

Lasiodiplodia theobromae is the cause of stem canker in the rubber plant (Hevea brasiliensis). Currently, data on environmental factors and cultivation techniques related to the development of stem canker are not available so research needs to be done on this subject. The objective of the study was to analyze environmental factors and cultivation techniques related to stem canker on rubber trees in southern Sumatra. Field observation was carried out at 21 locations in PT Perkebunan Nusantara VII and Experimental Garden of Sembawa Research Center, Indonesian Rubber Research Institute at Palembang to measure the severity and incidence of this disease. Besides that, the data of cultivation technique and the condition of the garden were taken from the officer at those locations. The location, clones, weed control and the number of plants/ha showed a correlation with the disease severity. There was a positive correlation between incidence and severity of the disease content of soil nitrogen, dust, clay and water as well as cation exchange capacity (CEC) were suggested to significantly contribute to the severity of stem canker.