Rendimiento de clones de Hevea resistentes a Dothidella ulei

Abstract

Data are tabulated of rubber yields. Los Diamantes* (Costa Rica) farm. of rubber clones resistant to the South America Leaf Blight (SALB) caused by Dothidella ulei. The information corresponds to the period from September 1960 to August 1962. Data are presented also for the first five years of tapping of the same trees, which began in 1953. The recent appearance of a new race of Dothidella makes it convenient to watch the performance of some clones like IAN-717 and FX-590. that hitherto had shown very high yields.