Abstract Background The selection of bioindicator plants can help in the determination of herbicide residues in the soil. Objective To analyze the levels of injuries and biomass reduction in bioindicator plants in the presence of S-metolachlor residue in the soil. Methods Four potential bioindicator species were evaluated: cucumber (Cucumis sativus), radish (Raphanus sativus), sorghum (Sorghum bicolor) and zucchini (Cucurbita pepo), in six doses of S-metolachlor (0, 180.5, 360, 720, 1440, and 2880 g ha-1). The plants were evaluated, 21 days […]

Abstract Background Straw, common in areas where no-till was adopted, can become a barrier for the applied herbicides to reach their destination, the soil. There is no information on the ability of the new herbicide pyroxasulfone to overcome this barrier and promote effective preemergence weed control. Objective To evaluate the effectiveness of pyroxasulfone in weed control when applied in different levels of straw, comparing it with herbicides available in the Brazilian market. Methods Two different experiments were carried out in […]

Abstract Background The corn intercropping with Brachiaria ruziziensis has rapidly raised in South and Center-West of Brazil. However, the uncertainty about forage interference on corn yield has led growers to use herbicides to suppress ruzigrass. Objective Our objective was to evaluate sub-doses herbicides applied in different stages of ruzigrass to suppress the growth in an intercropping system with corn. Methods A greenhouse experiment was carried out to evaluate the forage intoxication by herbicides to select the best treatments. Subsequently, a […]

Abstract Background The direct seeding system can be an alternative to reduce costs and labor in onion production, as it does not require the steps of production and transplantation of seedlings. However, this system results in early weed interference, lengthening the critical period of interference prevention. Objective To evaluate the selectivity of herbicide applications with residual activity on onions. Methods Three studies were carried out in a greenhouse. The first was carried out in a 5 x 4 factorial scheme, […]

Abstract Background In the largest areas and greater technification of the sweet potato production system, weeds are controlled with herbicides. However, there are only two herbicides registered for the crop in Brazil. Objective The aim of this study was to evaluate the selectivity of different herbicides for the sweet potatoes crop, depending on the genotype and dosage of each product. Methods Two experiments were carried out under field conditions, with the Canadense and Brazlândia Roxa cultivars, one for each cultivar. […]

Abstract Background Weed interference in canola crop causes losses such as reduced grain yield and quality. Objective The aim of this study was to evaluate the efficacy of herbicides applied for weed control in canola and the effect on crop grain yield. Methods Two experiments were installed, first (I) in 2018 crop season, and second (II) in 2019, in completely randomized design, with 17 treatments and four replications each. Experiment I was installed with canola hybrid Hyola 571 CL (Clearfield®), […]

Abstract Introduction Cultivation of rice ratoon is a technique in which regrowth is cultivated after harvest, with the objective of carrying out two successive harvests in the same area. This practice is intended to improve the productivity and profitability of rice cultivation. However, this model aggravates phytosanitary problems, making weed control more complex. Objective To evaluate the efficiency of the formulated mixture of imazapyr + imazapic without regrowth weed control, simulating the rice society’s growing conditions. Methods The experiment was […]

Abstract Background Pre-plant burndown using herbicides is a key practice in no-till cropping systems which has been complicated by the evolution of glyphosate-resistant (R) weed populations in Brazil. Objective To evaluate pre-plant burndown weed control efficacy of glyphosate-containing tank mixtures such that novel, cost-effective control options can be determined. Methods Glyphosate was sprayed alone or tank-mixed with 2,4-D, flumioxazin, saflufenacil, or ammonium-glufosinate onto nutsedge (Cyperus spp.), arrowleaf sida (Sida rhombifolia L.), and glyphosate-R Conyza spp. populations. Treatments ranged from one […]

Abstract Background Acetyl-CoA carboxylase (ACCase) enzyme inhibitors are post-emergent herbicides recommended for the control of sourgrass ( Digitaria insularis ). Water stress can influence the physiological processes and the effectiveness of these herbicides in weeds. Objective The objective of this work was to evaluate the effectiveness of ACCase enzyme inhibitors in the control of sourgrass after different periods of water restriction. Methods The treatments were organized in a factorial scheme (8×4). Factor A was composed of periods of water suspension […]

Abstract Background Recently, biotypes of sourgrass (Digitaria insularis) were identified in Brazil with multiple resistance to EPSPs-ACCase inhibiting herbicides, which demands the recommendation of herbicides with alternative mode of action, such as glufosinate-ammonium. Objective Therefore, this work was developed with the objective of modelling the efficacy of glufosinate-ammonium on sourgrass regarding to five different phenological stages. Methods Treatments consisted of eight rates of glufosinate-ammonium (1,600, 800, 400, 200, 100, 50 and 25 g ha-1, and check plots without herbicide application) […]

Abstract Introduction Obtaining good results in the no-tillage system is directly related to the adequate management of cover crops, combined with an efficient chemical control of weeds, involving residual herbicides. Objective To evaluate the effectiveness and selectivity of two mixtures of residual herbicide molecules (imazethapyr + flumioxazin and imazethapyr + saflufenacil) in different cover crops in soybean cultivated in the plant-apply system. Methods A completely randomized design was used, in a 3×3 factorial scheme, consisting of nine treatments and four […]