Abstract: Background: The advance of smooth pigweed and fleabane in soybean-ryegrass systems is associated with the evolution of weed resistance. Objective: Evaluate combinations of herbicides in burndown and pre-emergence for the control of smooth pigweed and fleabane in soybean, and the efficacy of herbicides in off-season management of smooth pigweed in ryegrass. Methods: Two field trials carried out in a complete randomized block design with four blocks. The first trial tested burndown (carfentrazone, carfentrazone+saflufenacil, carfentrazone+diquat, and diquat) and pre-emergent (PRE) […]

Resumen: Introducción: la resistencia de Bidens subalternans al glifosato y herbicidas inhibidores de ALS va en aumento en las regiones de producción de soja en Paraguay, por lo cual el uso de herbicidas pre-emergentes es cada vez más importante entre ellas el clomazone. Algunas formulaciones como las microencapsuladas pueden reducir el inconveniente de la volatilización de clomazone en comparación con otras formulaciones. Objetivo: el presente trabajo tuvo como objetivo evaluar la eficacia de diferentes formulaciones de clormazone en el control […]

Abstract: Background: Weeds compete with crops for resources, reducing agricultural productivity. Management practices involving cover crops and potassium fertilization can influence weed community dynamics. Objective: To evaluate the weed community in a Urochloa ruziziensis-sillage maize (Zea mays L.) for silage succession system, considering different potassium fertilizer (K) rates applied to the cover crop. Methods: During the fall-winter season, treatments included U. ruziziensis with six K rates (0, 30, 60, 90, 120, or 150 kg K2 O ha−1 as KCl) and […]

Abstract: Background: The genus Cynodon has great forage potential, but the management of its cultivars in Brazilian growing conditions is scarce. Objective: The objective was to evaluate the tolerance of Tifton 85 and Jiggs to different herbicides at post-emergence. Methods: The experiment was carried out in pots in a greenhouse. Two experiments were carried out, with Tifton 85 and Jiggs forages using twelve treatments, eleven herbicides (2,4-D, diuron, atrazine, fluazifop-p-butyl, glyphosate, nicosulfuron, imazethapyr, clethodim, haloxyfop-p-methyl, lactofem, tembotrione) and a control […]

Abstract: Background: Volunteer Acacia mangium represent a major challenge in Eucalyptus plantations due to the large seedbank remaining in the soil. The use of pre-emergent herbicides with residual effects is essential for achieving effective control of these weeds. Objective: To identify effective pre-emergent herbicides, with residual effects for controlling volunteer A. mangium in Eucalyptus plantations. Methods: Completely randomized design (CRD) was used with 4 replications. Trays (50 × 33 cm) were filled with a loamy topsoil from commercial plantations. Each […]

Abstract: Background: Benghal dayflower is a weed widely distributed in Brazil, known for its tolerance to glyphosate, requiring the use of alternative herbicides and more complex control strategies. Objective: Evaluate different auxinic herbicides in combination with glyphosate for the control of Benghal dayflower and assess the efficacy of glufosinate alone or in combination with PPO inhibitors in sequential applications. Methods: Two experiments were conducted in Ponta Grossa (PR-Brazil), using a randomized block design. The first experiment evaluated different auxinic herbicides […]

Abstract: Background: Cassava (Manihot esculenta) is native from Brazil, widely cultivated across the country, and is the third largest source of food in the Brazilian tropical regions. Mechanical weeding is commonly used for weed control in cassava, which can be associated with herbicides. Objective: To evaluate the weed control, phytosociology, yield, and sensory analysis of cassava treated with pre-emergent herbicides. Methods: Two field experiments were conducted, with a randomized block design and four replications. The treatments consisted of the herbicides […]