&lt;b&gt;Modeling the incidence of citrus canker in leaves of the sweet orange variety ‘Pera’

Danielle Da Silva Pompeu,Vanderly Janeiro,Aline Maria Orbolato Gonçalves-Zuliane,William Mario De Carvalho Nunes,José Walter Pedroza Carneiro,Terezinha Aparecida Guedes

doi:10.4025/actasciagron.v39i1.28535

<b>Modeling the incidence of citrus canker in leaves of the sweet orange variety ‘Pera’

Danielle Da Silva Pompeu, Vanderly Janeiro + Show 4 more

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https://doi.org/10.4025/actasciagron.v39i1.28535

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Abstract

Citrus canker, caused by the bacterium Xanthomonas citri subsp. citri , is one of the most important diseases of citrus. The use of resistant genotypes plays an important role in the management and control of the disease and is the most environmentally sustainable approach to disease control. Citrus canker incidence was recorded in an experiment on nine genotypes of the sweet orange variety ‘Pera’ grafted on four rootstocks. The experiment was started in 2010 and the incidence of citrus canker on the leaves was recorded on a quarterly basis. The incidence data from the experiment were analyzed using a zero-inflated Beta regression model (RBIZ), which is the appropriate method to describe data with large numbers of zeros. Based on the residual analysis, the data fit the model well. The discrete component of the explanatory variable, rootstock, was not significant as a factor affecting the onset of disease, in contrast with the continuous component, genotype, which was significant in explaining the incidence of citrus canker.

Highlights

According to Gonçalves-Zuliani, Nunes, Zanutto, Filho, and Nocchi (2015), citrus canker caused by Xanthomonas citri subsp. citri (Xcc, Schaad et al, 2006) is an important disease in many citrusproducing regions of the world (Gottwald et al, 2002)
The genotype Arapongas developed the highest incidence of citrus canker (Figure 1)
To check the outliers of the regressão Beta inflacionada de zero (RBIZ) model, we reviewed the residuals and

Summary

Introduction

According to Gonçalves-Zuliani, Nunes, Zanutto, Filho, and Nocchi (2015), citrus canker caused by Xanthomonas citri subsp. citri (Xcc, Schaad et al, 2006) is an important disease in many citrusproducing regions of the world (Gottwald et al, 2002). According to Gonçalves-Zuliani, Nunes, Zanutto, Filho, and Nocchi (2015), citrus canker caused by Xanthomonas citri subsp. Citri (Xcc, Schaad et al, 2006) is an important disease in many citrusproducing regions of the world (Gottwald et al, 2002). Xcc can cause disease in many commercial varieties of citrus, sweet orange In addition to direct yield loss, the lesions caused by citrus canker can preclude. In Brazil, citrus canker has been studied by several authors including Carvalho et al (2015); Gonçalves-Zuliani et al (2015) and Braido et al (2015). The search for genotypes resistant to citrus canker is the most attractive way to control this disease as it has least environmental impact (Gonçalves-Zuliani et al, 2015)

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