Fitonematoides associados à cultura da soja em municípios da Cantuquiriguaçu - PR

Abstract

Phytopathogenic nematodes, also known as phytonematods, may represent important production limiting factors for the main species of cultivated plants. One of the crops commonly affected by phytonematods is soybean, but little is known about the occurrence of these phytopathogens in municipalities of Cantuquiriguaçu region, Paraná state. In an attempt to obtain data about the distribution of phytonematods in four municipalities of the Cantuquiriguaçu, samplings were performed in 45 areas of soybean in reproductive phase, being 23 with diagnosis of reboleiras from the 2018-2019 crop. Soil and root samples were taken to the Phytopathology laboratory of the Federal University of Fronteira Sul - Laranjeiras do Sul (PR), for nematode extraction and preparation of semipermanent slides. The identified specimens were separated and counted for population density estimation. The results obtained in areas without, or with a reboleiras revealed the presence of the following genera: Helicotylenchus, Rotylenchulus, Lelenchus, Hoplolaimus, Aphelenchus, Criconema, Hemycicliophora, Dorylaimus and Xiphinema, with predominance of the Helicotylenchus genus. The occurrence of these agents associated with soybean demonstrates the importance of monitoring and the need for further studies for proper management in the crop.