Preliminary results of rubber tree clones behavior in the ecological conditions of Manaus

Abstract

Performance of fourteen two-year-old rubber tree clones (Hevea spp) were studied utilizing yield, height and stem diameter. The clones were tapped at 50cm of height from the grafting callus for determining yield potential by microtapping (MTP). Growth vigour was expressed by the diameter measured at 50 cm from the ground and height measured from the ground to the top. Results showed that the clones IAN 2925, IAN 873, Fx 3864. IAN 6720 and Fx 2261, had the best performance on yield. On the other hand, the clones IAN 6158, IAN 873 and IAN 6159 had been shown the best vigour in the clonal trial. No disease in epidemic character was detected among the clones. All of them showed tolerance to Microcyclus ulei.