Levantamento da ocorrência de enfezamentos em lavouras de milho no município de Pato Branco - PR, primeira safra de 2023/24 e safrinha de 2024

Abstract

Corn (Zea mays L.) is one of Brazil’s main agricultural commodities. According to data from Conab, 113 million tons were harvested in the country in 2023. However, corn cultivation faces challenges due to the presence of pests, such as the corn leafhopper (Dalbulus maidis). The objective of this work is to analyze the occurrence of the stunt complex in the Pato Branco-Paraná region in the 2023/2024 harvest and off season. The study was carried out in the municipality of Pato Branco, where commercial corn crops were observed, using the stunt severity rating scale for visual assessment of symptoms in plants. Different severity scores were obtained for stunting as well as productivity in different locations. In the first harvest, the corn hybrid DKB 235 PRO3 was one of the most productive (10,000 kg.ha -1), and presented the highest severity score of 1,3. The hybrid AS 1757 PRO 4 presented a score of 1 for severity, with production of approximately 6,000 kg.ha -1, being the second lowest productivity among the sites evaluated. These results may be associated with the genetic characteristics of each material. In the second harvest, similar results were obtained with the different cultivated materials. It is concluded that there was a uniform distribution of stunting in the locations evaluated, as well as the severity of the diseases. The severity scores for the harvest and off-season were low and we concluded that the diseases were not directly related to the productivity of the hybrids, but rather the cultural methods adopted in each location.