Ramularia leaf spot and boll rot are affected differently by organic and inorganic nitrogen fertilization in cotton plants

Oscar J. Palma-Zambrano; Freddy Zambrano-Gavilanes; Diego Portalanza; Felipe Rafael Garcés-Fiallos

doi:10.14393/BJ-v38n0a2022-61479

Authors

Oscar J. Palma-Zambrano Technical University of Manabí https://orcid.org/0000-0002-8316-4603
Freddy Zambrano-Gavilanes Universidad Técnica de Manabí https://orcid.org/0000-0003-0004-9122
Diego Portalanza Universidade Federal de Santa Maria https://orcid.org/0000-0001-5275-0741
Felipe Rafael Garcés-Fiallos Universidad Técnica de Manabí https://orcid.org/0000-0002-1795-4439

DOI:

https://doi.org/10.14393/BJ-v38n0a2022-61479

Keywords:

Disease progress, Gossypium hirsutum L., Logistic and Gompertz models, Nitrogen dose, Nitrogen fertilization.

Abstract

Interaction among nitrogen fertilization using bovine manure, poultry manure, Jatropha curcas seed cake and urea, and the diseases Ramularia leaf spot (RLS) and Boll rot (BR), caused by Ramulariopsis pseudoglycines and Diplodia gossypina, respectively, in cotton plants (Gossypium hirsutum L.), was studied under field conditions. Intensity (incidence and severity in percentage) of RLS and incidence (%) of BR were evaluated over time, starting in reproductive stage B1 (first visible flower bud). A randomized complete block design with a 4x4 factorial arrangement was used (fertilizers x doses), totaling 16 treatments with four replications. Disease progress was analyzed with the nonlinear Logistic and Gompertz models, obtaining the epidemiological parameters amount of initial disease (Y₀) and progress rate (r). Plants fertilized with 50 kg N ha^-1, presented an incidence twice greater than those obtained with other fertilizers. The Logistic model better fits RLS, but no model could represent BR. Only the epidemiological parameters of RLS were affected differently in this experiment compared to BR disease. The possible role of organic and inorganic nitrogen fertilization in the RLS and BR management is discussed.

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