Pesquisa Agropecuária Brasileira
Print version ISSN 0100-204X
GONCALVES, PAULO DE SOUZA et al. Promising hevea clones for Ribeira River Valley Region, São Paulo State, Brazil. Pesq. agropec. bras. [online]. 2000, vol.35, n.12, pp. 2343-2353. ISSN 0100-204X. http://dx.doi.org/10.1590/S0100-204X2000001200004.
The objective of this paper was to show first selection results of IAC 300 and Amazonian IAN and Fx series of rubber tree (Hevea brasiliensis (Willd. ex Adr. de Juss) Muell.Arg.) clones in small scale trial evaluation, for yield, growth and SALB performance. Yield and vigour of 20 clones were assessed for two and nine years, respectively, in Vale do Ribeira, SP, Brazil. In the IAC 300 serie, four clones (IAC 301, IAC 304, IAC 306 and IAC 319) were classified as satisfactory in yielding. The Amazonian clones IAN 6323, Fx 3864 and IAN 2903 produced 1,078 kg, 945 kg and 900 kg/ha/year, respectively, higher than the control IAN 873 (878 kg/ha/year). All selected clones had vigorous growing, with the girth at opening (cm) ranging from 37.40 (IAN 4493) to 53.75 (IAN 6323) and tappability ranging from 7.0% (IAN 4493) to 100% (IAC 6323 and IAC 302), except for Fx 3899 and IAN 3044. The IAC 315, with 7.37 mm, had bigger thickness virgin bark than IAN 873 (6.44 mm). Concerned to SALB performance, clones IAC 306, IAC 315, IAC 320 were the best in resistance.
Keywords : Hevea brasiliensis; growth; yields; tapping; pest resistance.