Response of four genotypes of tropical corn to the stunt caused for Spiroplasma kunkelli
DOI:
https://doi.org/10.59741/agraria.v9i3.491Keywords:
Zea mays, Spiroplasma kunkelli, apparent infection rateAbstract
The corn stunt spiroplasma (CSS), caused by Spiroplasma kunkelli, is one of the most destructive diseases of maize in the humid tropics of the Americas. In Mexico, this disease causes huge economic losses and serious deterioration in maize productivity rates. The aim of this study was to evaluate the response of four genotypes of maize to stunt complex (S. kunkelli) transmitted by Dalbulus maydis and its relationship to performance, resistance levels -by area under the disease progress curve (AUDPC)- and the apparent infection rate (r). The experiment was conducted in Ursulo Galvan, Ver., Mexico. The maize genotypes AN-543 and AN-543R, and the commercial controls A-7575 and VS-536 were evaluated. Twelve sowing dates under irrigated and rainfed conditions were tested and three samples by planting date were carried out at fifteen days intervals (60, 75 and 90 d). The experimental design was a randomized complete block. The results indicated that the genotypes AN-543 and AN-543R are more resistant to corn stunt than the controls. Genotypes with greater AUDPC had a higher infection rate in planting dates of March, April and May. There was a low correlation between performance and AUDPC. The degree of association between AUDPC and rate r is narrower at 45 % level, indicating that the most susceptible materials tend to have a greater disease progression.
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