Hongos y Oomycetes fitopatógenos en viveros de piña Ananas comosus (L.) Merril en Ciego de Ávila, Cuba
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Abstract
Death of postures caused by nursery pineapple diseases imposes the need of establishing effective phytosanitary control measures, which require a clear identification of their causal agents that allows realizing a proper and effective selection of active ingredients involved in protection. The aim of this work was to identify plant pathogens causing postures death in nursery through technological system fractionation of pineapple stems and crowns. Its implementation was developed in Plant Protection Laboratory of Ciego de Ávila Cuban province with samples from nurseries belonging to Ciego de Ávila Pineapple Enterprise. Samples, formed by stems fractions of Serrana Smooth Cayenne variety with visual symptoms of rot, were kept to the laboratory for processing through the application of microbiological techniques and procedures for the identifying of present species. They were incubated with moist chambers, insulation, fixed preparations, observed by optical microscopy and compared with taxonomic criteria for its determination. As a result there were described symptoms and morpho-physiological characters that identify as most responsible the phytopathogens fungi Fusarium subgutinas (Wr. & Reinke), P. E. Nelson, T. A. Tousson & Marasas, Phytophthora nicotianae Breda de Haan and Chalara paradoxa (De Seyn) Sacc. It emphasizes the pathogenic activity of these species on stems fractions that makes this propagation system in a highly sensitive method to have heavy losses by these phytopathogen fungi.
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