REACTION OF THE MAIN SUGARCANE CULTIVARS TO Colletotrichum falcatum WENT IN CUBA
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Abstract
Red stem rot of sugarcane, caused by Colletotrichum falcatum (Went), causes a significant reduction in the quality and yield of susceptible cultivars. The objective of this study was to determine the resistance to this disease of 54 commercial sugarcane cultivars in Cuba. The experiment was established in October 2020, in the experimental block of the Mayabeque Sugarcane Research Institute (INICA Mayabeque) with 54 commercial hybrids. The following were used as controls: 'PR980', highly resistant; 'Ja60-5', resistant; 'My5514', moderately resistant; 'B4362', susceptible; and 'C137-81', highly susceptible. The inoculation of the pathogen was carried out at 12 months of age in the third basal internode of 25 stems of each cultivar with a conidial suspension with a concentration of 5 x 105 cfu. mL-1. Thirteen months later, the degree of resistance and severity achieved in each cultivar was evaluated. A cluster analysis was performed using the InfoStat statistical package to group the cultivars. Seventy-five percent of the genotypes evaluated showed varying degrees of resistance to red stem rot (20% highly resistant, 31% resistant, 33% moderately resistant), and 15% were classified as susceptible. Five groups of commercial hybrids were formed in the cluster analysis. The low percentage of cultivars categorized as susceptible and the absence of highly susceptible cultivars allow for proper management of commercial plantations without the risk of causing epiphytes.Red stem rot of sugarcane, caused by Colletotrichum falcatum (Went), causes a significant reduction in the quality and yield of susceptible cultivars. The objective of this study was to determine the resistance to this disease of 54 commercial sugarcane cultivars in Cuba. The experiment was established in October 2020, in the experimental block of the Mayabeque Sugarcane Research Institute (INICA Mayabeque) with 54 commercial hybrids. The following were used as controls: 'PR980', highly resistant; 'Ja60-5', resistant; 'My5514', moderately resistant; 'B4362', susceptible; and 'C137-81', highly susceptible. The inoculation of the pathogen was carried out at 12 months of age in the third basal internode of 25 stems of each cultivar with a conidial suspension with a concentration of 5 x 105 cfu. mL-1. Thirteen months later, the degree of resistance and severity achieved in each cultivar was evaluated. A cluster analysis was performed using the InfoStat statistical package to group the cultivars. Seventy-five percent of the genotypes evaluated showed varying degrees of resistance to red stem rot (20% highly resistant, 31% resistant, 33% moderately resistant), and 15% were classified as susceptible. Five groups of commercial hybrids were formed in the cluster analysis. The low percentage of cultivars categorized as susceptible and the absence of highly susceptible cultivars allow for proper management of commercial plantations without the risk of causing epiphytes.
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Javier Delgado Padrón1* (orcid.org/0000-0001-8277-9879), Francisco Alfonso Rodríguez1 (orcid.org/0000-0001-8835-4739), Yaquelin Puchades Izaguirre1 (orcid.org/0000-0001-6608-499), Tania Casero Rodríguez1 (orcid.org/0000-0002-6423-3191), Leodanis Tur Verdecía1 (orcid.org/0009-0009-3264-682X), Germán Antonio Hernández Pérez1 (orcid.org/0000-0001-5629-0519), Alejandro Hernández Rubiella1 (orcid.org/0000-0002-4624-1411),