Evaluation of resistance of corn varieties to Dalbulus Maidis (Delong & Wolcott) (Hemiptera: Cicadellidae)

Abstract The aim of this study was to evaluate the resistance of 10 corn varieties to Dalbulus maidis. The attractiveness of corn plants to D. maidis for feeding and/or shelter, as well as oviposition with and without choice, was examined. The effects on the development stages of D. maidis in different varieties and the damage caused by D. maidis in corn plants were assessed. The IAC AIRAN and Amarelo Astecão varieties showed the highest mean preference by adults compared to Pipoca Roxo Kika, which was the least preferred. For oviposition with a choice, there was no statistically significant difference, but for oviposition without a choice, more eggs were laid on Al Bandeirante compared to Amarelo Astecão. Insects maintained on NS 90 PRO 2 plants exhibited the longest nymphal period, and those on Pipoca Roxo Kika had the longest developmental period compared to insects on Branco Pedro 2. Insects on Amarelo Laleska, Amarelo Astecão, NS 90 PRO 2, Pipoca Roxo Kika, and Vermelho Pedro showed the shortest longevities compared to insects on Al Bandeirante. Growth percentage data and visual damage scale did not show statistically significant differences. A dendrogram indicated the formation of two major groups: susceptible varieties and resistant varieties. The results of this research may have identified sources of resistance in corn plants, which could assist in controlling D. maidis, guide the selection of materials for cultivation in the field, and inform corn breeding programs.