COMPORTAMENTO DE PLANTAS DANINHAS A Rotylenchulus reniformis EM DIFERENTES SOLOS

Abstract

Nematodes are important harmful agents in agriculture, and among them we find Rotylenchulus reniformis. A nematode difficult to manage as it can survive for a long time in the soil and has many hosts. Weeds also cause losses to cultivated plants as they compete for water, light, and nutrients, and they act as secondary hosts for pests, diseases, and nematodes. Therefore, this work aimed to evaluate the hostability of Senna obtusifolia (L.) (Chinese Senna or American sickle pod), Commelina benghalensis (L.) (Benghal dayflower, tropical spiderwort, or wandering Jew), Digitaria insularis (L.) (sourgrass), Ipomoea grandifolia (scarlet morning glory), Euphorbia heterophylla (L.) (Mexican fireplant or milkweed), Eleusine indica (L.) (goosegrass) and Rotylenchulus reniformis, on different soil types. The experimental design used was a completely randomized design, and it was conducted in a greenhouse at the headquarters of the Mato Grosso Soybean Producers Association (APROSMAT) in Rondonópolis, MT. The number of nematodes per gram of root (n/g), reproduction factor (RF), and the interaction between the tested soils and the evaluated species were assessed. It was found that wandering jew, sicklepod, and morningglory were highly susceptible to the nematode Rotylenchulus reniformis, as all of them had RF values much higher than 1. On the other hand, milkweed, sourgrass, and goosegrass showed low susceptibility to Rotylenchulus reniformis, with RF values below 1, indicating that they do not support the multiplication of this nematode. The Quartzarenic Neosol was the only soil that did not favor the multiplication of R. reniformis.