Breeding of Fruit and Plantation Crops 2 + 1

Important clones are described below

• RRII105: A clone evolved by Rubber Research Institute of India and currently enjoying maximum popularity in the country. Parents are Tjir I and GI 1. Trunk is tall and straight. Branching is good with strong unions, canopy dense, foliage dark green, leaflets long and glossy, wintering, and refoliation early and partial, Virgin and renewed bark thickness good. Average yield is 2,400 kg/ha/year. Latex is white and DEC high. The clone has a fair degree of tolerance to abnormal leaf fall. Highly susceptible to pink disease and incidence of powdery mildew is medium. Occurrence of tapping panel dryness is high and therefore, to be tapped under half spiral once in 3 days (s2d3).
• RRIM 600: It is a high-yielding variety evolved by the Rubber Research Institute of Malaysia and extensively grown in all rubber growing countries. Parents are Tjir 1 and PB 86. Tall straight trunk, moderate to fairly heavy branching and branch unions rather weak. It shows normal wintering and refoliation. Girth at opening is low. Girth increment after opening high and virgin bark thickness is low. Thickness of renewed bark is high usually results in trend. Average annual yield is 1,387 kg/ha. Latex is unsuitable for concentration. It is susceptible to diseases caused by Phytophthora.
• GT 1: A primary clone developed in Indonesia and extensively planted in all rubber-growing countries. Trunk up¬right with variable branching habit. Wintering and refoliation late and often partial. Girth at opening medium to high. Girth increment on tapping and virgin and renewed bark thickness medium. Average annual yield is 1,400 kg/ ha/year. Latex is white. Occurrence of tapping panel dryness and incidence of pink disease mild. Abnormal leaf fall mild to medium and powdery mildew medium to severe.