Interacting effects on absorption and translocation of 14 C-mesotrione and 14 C-atrazine mixture for morning glory ( Ipo
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Interacting effects on absorption and translocation of 14C‑mesotrione and 14C‑atrazine mixture for morning glory (Ipomoea hederifolia) control Ricardo Ferraz Silveira1 · Vanessa Takeshita1 · Kassio Ferreira Mendes2 · Fabricia Cristina dos Reis1 · Rodrigo Floriano Pimpinato1 · Valdemar Luiz Tornisielo1 Received: 8 May 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract The objective of this study was evaluate the interacting effects on absorption and translocation of 14C-mesotrione and 14 C-atrazine mixture for morning glory (Ipomoea hederifolia) control. The mixture of atrazine + mesotrione was shown to be additive and synergistic by visual assessment in relation to expected control, depending on the dose and evaluation period. Absorption of 14C-atrazine alone (62.5%) and as a mixture (60%) in morning glory was higher than in the treatments with 14C-mesotrione alone (42.8%) and as a mixture (46.6%). However, 14C-mesotrione alone showed a higher translocation (8.6%) than 14C-mesotrione + atrazine (2.5%), indicating that the mixture decreased the translocation of this herbicide. Keywords Atrazine · Mesotrione · Herbicides · Radioisotopes · Weed management
Introduction For the efficient control of weeds in intensive agricultural systems, there is an increasing need for broad-spectrum herbicides, which control many different weeds, which has led to the frequent application of tank mixtures with two or more herbicides. The application of tank mixtures whose interactions are unknown may lead not only to the inefficiency of the herbicides used, but also to environmental damage, and may affect subsequent crops or even lead to the contamination of springs and groundwater through the processes of herbicide runoff to the environment [1]. In addition, the use of herbicide mixtures with different mechanisms of action mitigates the risk of selecting tolerant and/or resistant weeds [2, 3]. These advantages come from the interactions between herbicides [4]. These interactions between two or more herbicides can be additive, synergistic, or antagonistic. * Vanessa Takeshita [email protected] 1
Center Nuclear Energy in Agriculture, University of São Paulo, Centenário Avenue 303, Piracicaba, São Paulo 13416‑000, Brazil
Department of Agronomy, Federal University of Viçosa, Peter Henry Rolfs Avenue, Viçosa, Minas Gerais 36570‑900, Brazil
2
Among the species of weeds infesting Brazilian sugarcane plantations are those known popularly as morning glories [5–7]. Climbing weeds of the Convolvulaceae botanical family belonging to the genera Ipomoea and Merremia are of special concern due to the problems caused to the harvesting operation, where they clog the harvesters and reduce the efficiency of the operation [8]. Among the herbicides recommended for the control of morning glory species (Ipomoea hederifolia L.) in sugarcane and corn crops, are atrazine and mesotrione. Atrazine is an inhibitor of the photosystem II (PSII), blocking the transport of electrons in PSII and causing the death of the plant by oxidative str
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