000			01306nam a2200193Ia 4500
008			220216s9999 xx 000 0 und d
100			_aAraujo A E
245		0	_aAssessment of Hevea rubber tree genotypes (Hevea spp.) to Microcyclus ulei to identify sources of horizontal resistance
260			_bActa Amazonica _c1997
300			_a27-32
500			_aSource Year: 1998
520			_aThe 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.
650			_aHevea
650			_aMicrocyclus ulei
700			_aFilho _BA N Kalil
700			_aNobrega M B DE M
856			_uRPP
942			_cJS
999			_c54541 _d54541