TY  - BOOK
AU  - Araujo A E
AU  - Filho
AU  - Nobrega M B DE M
TI  - Assessment of Hevea rubber tree genotypes (Hevea spp.) to Microcyclus ulei to identify sources of horizontal resistance
PY  - 1997///
PB  - Acta Amazonica
KW  - Hevea
KW  - Microcyclus ulei
N1  - Source Year: 1998
N2  - The resistance of Hevea rubber tree genotypes to South American leaf blight, caused by M. ulei, was evaluated. Two isolates of M. ulei were used. Seedlings in polyethylene bags were inoculated at the B1/B2 growth stage with 2 x 10 raised to 5 conidia/ml. The plants were incubated in humid chambers for 24 hours at 24 degree C. The latent  period (PL), lesion diameter (DL), lesion type (TL) and the reaction type (TR) were determined. Most of the genotypes are completely susceptible to at least 1 isolate, were susceptible to the other. Only the AM/86/271 genotype showed incomplete resistance characterized by a longer PL, small DL and low sporulation. It is concluded that the genotypes tested do not have resistance which could be used in a breeding programme
UR  - RPP
ER  -