RESISTANCE OF RUBBER CLONES RECOMMENDED IN INDONESIA TO CORYNESPORA AND COLLETOTRICHUM LEAF FALL DISEASES
Leaf fall disease caused by Corynespora cassiicola and Colletotrichum sp. can causes reduction of latex production in rubber plantations. Hence screening for disease development in each rubber clone needs to be carried out. Resistance level of 25 rubber clones recommended in Indonesia to leaf fall diseases were examined on rubber plants grown in polybags placed in a greenhouse using three isolates each of C. cassiicola and Colletotrichum sp. isolated from the rubber clones RRIM 600, GT 1, and PR 303. The results showed that 9 rubber clones i.e AVROS 2037, BPM 1, BPM 109, IRR 42, IRR 107, IRR 220, PB 260, PB 330, and RRIC 100 had a high resistance to both the leaf fall diseases while 4 clones i.e BPM 24, PR 261, PR 300, and PR 303 had a low resistance. The other clones had a high resistance against only one of the diseases.
Keywords:Â Â Colletotrichum sp., Corynespora cassiicola, leaf fall disease, rubber clones.