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by Phillips, W; Galindo, J.J; Sociedad Mexicana de Fitopatología, México (México); American Phytopathological Society, St. Paul, Minn. (EUA). Caribbean Div; 12. Congreso Nacional; 25. Annual Meeting SMF/APS-CD Guanajuato (México) 11-14 Set 1985.
Publisher: México (México) 1985Description: resumen no. 53.Other Title: Reaction of cacao cultivars to inoculation with Monilia roreri Cif & Par.Subject(s): THEOBROMA CACAO | CULTIVARES | CLONES | MONILIOPHTHORA RORERI | ENFERMEDADES FUNGOSAS | INOCULACION | MEDIO DE CULTIVO | MORBOSIDAD | RESISTENCIA A LA ENFERMEDAD | POLINIZACION MANUAL | TURRIALBA | COSTA RICA | THEOBROMA CACAO | CULTIVARS | CLONES | FUNGAL DISEASES | INOCULATION | CULTURE MEDIA | MORBIDITY | DISEASE RESISTANCE | COSTA RICA | THEOBROMA CACAO | CULTIVAR | CLONE | MALADIE FONGIQUE | INOCULATION | MILIEU DE CULTURE | MORBIDITE | RESISTANCE AUX MALADIES | COSTA RICASummary: Thirty-one cacao clones (Theobroma cacao L.) were evaluated for resistance to M. roreri at Turrialba (22 centigrade, 2638 mm rain). Sixty-day-old pods from hand pollinated flowers were inoculated with 0.5 ml of a conidial suspension (10 exponent 5/ml conidia) using a De Vilbiss atomizer. Inoculum was prepared from 14 day-old cultures grown on oat-dextrose-agar (5.0, 2.0, 1.5 percent). Inoculated pods were covered with plastic bags containing wet paper towels, which were removed from the bags 48 hr after inoculation. Internal an external disease severity and incidence were rated 9 wk after inoculation, using a scale 0 to 5, (0 = no disease; 5 = major minor 80 percent). Using this method, it was possible to find consistent differences in susceptibility to M. roreri among clones tested. Clones UF-273, EET-183, EET-67, CC-137 and EET-75 showed low internal (0.3 to 0.90) and external (0.4 to 0.8) severity that was significantly different from the other clones tested. Clones UF-221, CC-52, EET-333, Pound 7 and CC-132 were highly susceptible (4.5 to 4.9 and 4.2 to 4.8, respectively). A positive correlation was found between internal severity and disease incidence
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Thirty-one cacao clones (Theobroma cacao L.) were evaluated for resistance to M. roreri at Turrialba (22 centigrade, 2638 mm rain). Sixty-day-old pods from hand pollinated flowers were inoculated with 0.5 ml of a conidial suspension (10 exponent 5/ml conidia) using a De Vilbiss atomizer. Inoculum was prepared from 14 day-old cultures grown on oat-dextrose-agar (5.0, 2.0, 1.5 percent). Inoculated pods were covered with plastic bags containing wet paper towels, which were removed from the bags 48 hr after inoculation. Internal an external disease severity and incidence were rated 9 wk after inoculation, using a scale 0 to 5, (0 = no disease; 5 = major minor 80 percent). Using this method, it was possible to find consistent differences in susceptibility to M. roreri among clones tested. Clones UF-273, EET-183, EET-67, CC-137 and EET-75 showed low internal (0.3 to 0.90) and external (0.4 to 0.8) severity that was significantly different from the other clones tested. Clones UF-221, CC-52, EET-333, Pound 7 and CC-132 were highly susceptible (4.5 to 4.9 and 4.2 to 4.8, respectively). A positive correlation was found between internal severity and disease incidence

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