Bibliographic citations
Vicuña, A., (2023). Caracterización de especies de Lasiodiplodia que afectan el cultivo de palto (Persea americana) en la costa peruana [Universidad Nacional Agraria La Molina]. https://hdl.handle.net/20.500.12996/5861
Vicuña, A., Caracterización de especies de Lasiodiplodia que afectan el cultivo de palto (Persea americana) en la costa peruana []. PE: Universidad Nacional Agraria La Molina; 2023. https://hdl.handle.net/20.500.12996/5861
@mastersthesis{renati/244750,
title = "Caracterización de especies de Lasiodiplodia que afectan el cultivo de palto (Persea americana) en la costa peruana",
author = "Vicuña Rossell, Ana Ysabel",
publisher = "Universidad Nacional Agraria La Molina",
year = "2023"
}
The avocado (Persea americana Mill.) Hass variety is an important fruit crop and widely cultivated in various departments of the coast of Peru. In recent years, a strong incidence of lesions or cankers has been observed in avocado branches with the presence of whitish exudations and regressive death that caused alarm in the producing areas of Piura, Lambayeque, La Libertad, Ancash, Lima and Ica. The objectives of this study were to identify the Lasiodiplodia species associated with these symptoms, determine the distribution of these species, and test their pathogenicity and virulence in Hass avocado plants. In 2018, symptomatic samples were collected in the aforementioned avocado producing areas, and 364 isolates of Lasiodiplodia were obtained. Identification was carried out by phylogenetic analysis based on DNA sequence data of the internal transcribed spacer region and part of the translation elongation factor 1-α genes. Maximum sequence analyzes were carried out using the plausibility method. Four species of Lasiodiplodia were identified as Lasiodiplodia theobromae, Lasiodiplodia pseudotheobromae, Lasiodiplodia egyptiacae and Lasiodiplodia parva. All Lasiodiplodia species in the present study were reported for the first time in association with Hass avocado in Peru and around the world. L. theobromae with 68.96 percent of the isolates, was the species with the highest frequency isolated, followed by L. pseudotheobromae with 19.78 percent and L. egyptiacae with 10.99 percent. The pathogenicity in young Hass avocado plants inoculated with mycelial discs showed that all identified Lasiodiplodia species were pathogenic, causing cankers and necrotic lesions in the internal tissue, L. pseudotheobromae and L. egyptiacae were the most virulent.
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