Dinâmica populacional de Dalbulus maidis (DeLong & Wolcott) (Hemiptera: Cicadellidae) em milho no sudoeste do Paraná

Abstract

The Corn Leafhopper (Dalbulus maidis), is one of the main pests that attack the corn crop, causing significant productivity losses through the transmission of pale and red stunting and the corn stripe virus. The present work had as objective to monitor this pest through a, and to verify if the variation of climatic factors as temperature and relative humidity of the air, influence in the occurrence of this insect. Yellow sticky traps were installed in the 2022 safrinha, in two crops in the municipality of Pato Branco - Paraná, to capture the insect, 50 cm from the ground. 30 traps were placed in each area, 30 meters away from each other, and renewed approximately every 15 days, until a total of 7 collections were collected in each field. Monitoring started at the phenological stage of the second developed leaf (V2) and continued until the reproductive stage of tooth formation (R5). Insects were counted and then correlated with temperature and relative humidity values. The number of leafhoppers captured was lower in the first stages of the culture, with a population peak occurring in the months of May to June. The average temperature and relative humidity did not vary significantly in the analyzed period, in a way that negatively interfered with the development of the pest, thus providing conditions for the occurrence of the biotic potential of Dalbulus maidis.