In Latin America, there are areas that favor the cultivation of rubber (Hevea brasiliensis) and reduce the risk of South American Leaf Blight (SALB), produced by the pathogen Pseudocercospora ulei. This study aimed to analyze the growth, early yielding and SALB resistance of nine promising clones and IAN 873 (control) in the pre-tapping and early tapping phases in a large-scale clone trial in a low SALB pressure zone in the Colombian Amazon, 2010−2019. San Vicente del Caguán (Caquetá) has climatic characteristics that are not very favorable for SALB (mean precipitation < 2600 mm year⁻¹ and average relative humidity < 82 %). After 10 years, the better clones (FX 3899 P1, FDR 4575, FDR 5578, GU 198 and FDR 5597) presented an acceptable average for the main trunk circumference (CMT < 52 cm) at the end of the pre-tapping phase (9th year), a favorable CMT (< 58 cm) in the early tapping phase (1 st year tapping or 10th year), a superior early dry rubber yield (EDRY) (< 43 g.tree⁻¹.tap⁻¹), a high partial resistance to SALB (low severity, with mean scores for AT1 and AT2 < 1 and low asexual and sexual sporulation, with mean scores for TR and ST < 1) and a high percentage of leaves retained in the canopy (80–100 %), as compared to clone IAN 873. This study provides the basis for final clonal selection once peak yield (5th year tapping) is identified for later development in the Amazon region, Colombia.

在拉丁美洲，有些地区有利于橡胶（巴西橡胶树）的种植，并减少由病原体假单胞菌（Pseudocercospora ulei）产生的南美白叶枯病（SALB）的风险。这项研究的目的是在哥伦比亚亚马逊河低SALB压力带的大型克隆试验中，在预攻和早期攻丝阶段分析9个有前途的克隆和IAN 873（对照）的生长，早期产量和SALB抗性， 2010-2019。San Vicente delCaguán（Caquetá）的气候特征对SALB不太有利（平均降雨量<2600 mm年^-1平均相对湿度<82％）。10年后，更好的克隆（FX 3899 P1，FDR 4575，FDR 5578，GU 198和FDR 5597）在预攻丝阶段结束时（第9个）呈现出主干周长（CMT <52 cm）的可接受平均值。年），早期出胶阶段（第一年或第10年）的良好CMT（<58厘米），早期干胶产量（EDRY）优越（<43克tree ^-1 .tap ^-1），对SALB的部分抗药性较高（严重程度较低，AT1和AT2平均得分<1，无性和性孢子形成率较低，TR和ST的平均得分<1），并且在冠层中保留的叶片百分比很高（80 – 100％），与IAN 873克隆相比。一旦确定了最高产量（攻入5年）后可在哥伦比亚的亚马逊地区开发，这项研究为最终克隆选择提供了基础。