Major Diseases of Hevea brasiliensis in Rubber Growing Regions of South India

摘要

Disease surveys were conducted to appraise the incidence and severity of major leaf diseases of rubber in the non-traditional rubber growing areas of South India. Abnormal leaf fall (ALF) disease caused by Phytophthora sp., powdery mildew (PM) causedby Oidium heveae, colletotrichum leaf spot (CLS) caused by Colletotrichum spp and corynespora leaf fall (CLF) caused by Corynespora cassiicola were the disease included in the study. The study revealed that ALF, PM and CLS occured consistently in almostall the plantations surveyed, while CLF was not so wide spread in hilly areas. In Subramanya, Puttur, Belthangady, Kundapura and Sullia areas the incidences of both CLS and CLF occurred to aggravate the damage. Observations on incidence of diseases on different clones revealed that the clones, RRIM 600 and GT1 suffered severely from ALF and PM diseases where as RRH 105 from CLF and CLS diseases.