Resistance to a new species of Phoma (Boerema, written communication) was tested by inoculating twice with a suspension of 1 x 10^6 spores by ml. of the fungus. Twenty four plants out of more than 4000 from 178 different genotypes were classified as immune (no disease symptoms). Those plants and the ones with the lowest intensity of disease were transplanted to a field in which the pathogen had been detected previously. All of the plants were eventually killed at the adult stage. In spite of the above, ti was observed that the advance of the disease was slower in such plants in comparison with susceptible plants (cv. Licato) included as controls. Data obtained with the most resistant materials are included in Table 1.
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Plants in each disease
class (2)
Genotype Source (1) 0 1 2 3 4 5
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L 1533 AVRDC 14 8 6 - - -
Tropic UF 4 8 8 2 - 14
3668-2 UF 2 7 3 1 - -
6058-FPBK UF 1 - 1 - - -
6101-FPBK UF 2 - 2 2 - -
L 1519 AVRDC 1 - 1 1 6 -
L 1531 AVRDC - - 20 8 2 16
L 1150 AVRDC - 1 4 16 7 6
Imp. Summertime T. - 1 3 13 7 16
Licato (control) ICA - - 3 20 46 91
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(1) AVRDC: Asian Vegetable Research and Development Center
UF: AREC Bradenton, Univ. of Florida
T: Texas Agricultural Experiment Station
ICA: Instituto Colombiano Agropecuario
(2) 0: Immune
5: Dead