Chemical products for corn bacterial streak control

Alex Junior Pietrobon,Odair José Kuhn,José Barbosa Duarte Júnior

doi:10.1590/1983-40632021v5168121

Alex Junior Pietrobon, Odair José Kuhn + Show 1 more

Open Access

https://doi.org/10.1590/1983-40632021v5168121

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Abstract

ABSTRACT Xanthomonas vasicola pv. vasculorum is one of the main bacterial diseases in corn, which causes damage to crops due to its fast dissemination and difficult control. This study aimed to evaluate the effects of chemical products on its control and corn grain yield. The experimental design was randomized blocks, in a 2 x 7 factorial arrangement, with three replications. The first factor consisted of the corn hybrids P30F53VYHR (more resistant to the disease) and P4285VYHR (more susceptible) and the second one of six active ingredients (kasugamycin, sulfur, cuprous oxide, copper oxychloride, quaternary ammonia and potassium phosphite) and one control (no application). The obtained data were used to estimate the area under the disease progress curve. The products based on quaternary ammonia, cuprous oxide, copper oxychloride and kasugamycin provided a greater disease control. P30F53VYHR presented a higher grain yield than that for P4285VYHR. Therefore, the use of a genetically resistant hybrid is an efficient alternative for the management of this bacteriosis.

Highlights

Corn is the most important and most cultivated cereal in the world
The corn bacterial streak, caused by Xanthomonas vasicola pv. vasculorum (Xvv), is responsible for significant damages, with symptoms that may occur at any development stage (Leite Junior et al 2018)
The irrigation system complemented the low rainfall volume and provided the necessary conditions for the development of the pathogen. This fact may be associated with the pathogen’s adaptation to warm climates, where periodic irrigations facilitate its spread throughout the crop (Broders 2017)

Summary

Introduction

Corn is the most important and most cultivated cereal in the world. Brazil is the second largest producer of this grain, with a record production of 102.1 million tons in the 2019/2020 harvest (Conab 2020). Many areas cultivated with corn use direct sowing and monoculture, and no crop rotation systems. There is an increase in the incidence of diseases and, above all, in the intensity of infections by pathogens. Among the limiting conditions of corn cultivation, diseases caused by bacteria are of great relevance, as they affect roots, stalk, leaf tissue or grains (Medeiros et al 2018). The corn bacterial streak, caused by Xanthomonas vasicola pv. Vasculorum (Xvv), is responsible for significant damages, with symptoms that may occur at any development stage (Leite Junior et al 2018) The corn bacterial streak, caused by Xanthomonas vasicola pv. vasculorum (Xvv), is responsible for significant damages, with symptoms that may occur at any development stage (Leite Junior et al 2018)

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