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Rubber clone recommendation in Cambodia for 2007-2009

Chan C., Chetha P., Bunthuon H., Lacote R., Clément-Demange A.. 2006. In : Rubber Conference, 10 November 2006, Siem Riep, Cambodia. s.l. : s.n., 8 p.. Rubber Conference, 2006-11-10, Siem Reap (Cambodge).

Since 1995, the Cambodian Rubber Research Institute (CRRI) has established a network of clone trials in the rubber growing traditional regions in Kampong Cham, Kratie and Rattanakiri Provinces in an altitude lower than 200 m.a.s.l. The ecological conditions were noted that 6-month rainy season and 6-month drying season, which the absolute temperature is in the interval of 16 °C and 410 C, the wind speed varied from 1 m/s to 7 m/s and the average rain fall is lower than 1,500 mm. The Agro-climatic constraint for rubber growing in Cambodia is the rainy season including an irregular drying season, which causes a big problem for planting rubber trees. The most important rubber diseases in Cambodia are Pink disease and Oidium leaf fall disease. Colletotrichum leaf disease, Phytophthora panel disease and Phytophthora leaf fall disease are sometimes severe, others diseases are not of importance. Root diseases and Corynespora are temporarily absent in Cambodia. Up to now, there are 19 LSCT and 20 simple small scale clone trials (SSSCT) have been established. CRRI has established and continuously surveyed a network of clone trials in major rubber growing areas. The result derived from network clone trials permitted to upgrade the promising clones for the planting recommendation, which has been improved every 3 years. Database from the network of LSCT planted in 1995-96 indicated that, under the favorable conditions of central, East and North-East regions, the growth in immature period to the first four years of tapping of clones PB235, IRCA130, PB330, PB280, RRIC101, RRIC110, IRCAllland KV4 appeared to be better than GT1 (control clone). Clones KV4, PB260, RRIM600 and PR107 had moderate growth and comparable to GT1 and the growth of IRCA18, RRIM712 and PR series clones appeared lower than GT1. The LSCT planted in 1986 in CHUP company shows that the cumulated yield in 12 years of clones KV4,'PB235, RRIM600, PB324, PB310, PB255, RRIC110, RRIC121, PB255 and PB324 are higher than GT1, but the clones PR107, RRIC102 and PB86 yielded less than GT1. It also mention that the clone PB 235 has the best growing and followed by RRIC 121, PB255, PB310, PB324 and RRIC110, all are better than GT1, but the other clones grow lower than GT1. Although the yield performance of traditional clones such as GT1, RRIM 600 and PR107 show less than some new foreign clones, they were usually classified in class I and class II, especially GT1 which is usually planted on the wide areas and it was seen as a security clone. GT1 and RRIM 600 will be proposed again in class I for the period of 2007-2009. The promising clones such as IRCA230, IRCA130, PB217, PB235, PB255, PB260, PB314, PB330, KV4, and RRIM712 were contributed to the diversification of the planting recommendations.

Mots-clés : hevea brasiliensis; cambodge

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