ABSTRACT:The plants invasion of Conyza genus has occurred in several regions in Brazil and in the world, due to the selection caused by the continuous use of herbicides with the same active, causing losses in production. This work aims to evaluate the association of herbicides in the control of C. canadensis. The trial was carried out on a farm, in MG, in a Mundo Novo coffee plantation, in a randomized block design (RBD), with 7 treatments and 4 replications, totalizing 28 plots. The

This work aimed to present the optimum environment number methodology and propose the optimization of the National Sunflower Trials Network, by means of the environments exclusion that do not provide loss of the environmental variability already established. Grain and oil yield data of 16 genotypes evaluated at 16 environments of the National Sunflower Trials Network, obtained from trials conducted out-of-season in 2012 and 2013 were used. An analysis was proposed to establish the optimum environment number for genotypes evaluation, based on genotype performance in the various environmental combinations. The removal or maintenance of environments in the experimental network was dynamic, since different environmental combinations impacted the representativeness of the complete network in a different way. This analysis also provides a graphical view of the impact of the environment removal from the network. Once detected points below the established correlation, the researcher could infer about the network minimum environment number and, suggest through consistent information of several testing years, the environment exclusion.

This study aimed to verify whether the fatty acid profiles of mid-oleic genotypes grown in the tropical region of Brazil fit the Codex Alimentarius and to examine the possibility of using traditional inbred lines to produce high-oleic hybrids. For this purpose, we assessed the fatty acid profile of six mid-oleic hybrids grown in environments with different minimum temperatures during oil formation in the achenes. The tests were conducted between 2015 and 2017 in an experimentally randomized complete block design with four replications. The oleic, linoleic, palmitic, and stearic acid contents were determined using gas chromatography. The mid-oleic hybrids presented varying levels of fatty acids, with oleic acid ranging between 43.6% and 84.6%, linoleic acid between 8.5% and 45.6%, palmitic acid between 3.9% and 5.7%, and stearic acid between 2.2% and 6.2%. Some of the fatty acid values were outside the ranges established by the CODEX STAN 210-1999 and were characteristic of high-oleic type sunflowers. This finding shows that we can take advantage of the potential of combining traditional inbred lines to produce high-oleic hybrids for faster and more economical breeding programs in these environments.

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Dayflower weeds are tolerant to some herbicides; an alternative for their control is the addition of adjuvants in the solution to be applied to improve the efficiency of these products. Thus, the objective of this work was to evaluate the effect of application of different herbicides with and without adjuvants on the control of dayflower weeds. The experiment was conducted under field conditions in April 2015 on the Santo Azarias Farm, Muzambinho, state of Minas Gerais, Brazil. The area had coffee crops (cultivar Catuaí/Vermelho 144) with plant spacing of 3.00 m × 1.00 m, which had been subjected to a hard pruning. A randomized block experimental design was used, with 9 treatments in 3 blocks, totaling 27 plots. The treatments consisted of four contact herbicides (Saflufenacil 700.0 g kg-1, at 140.0 g c.p. ha-1; Bentazon 600.0 g L-1, at 1.2 L c.p. ha-1; Paraquat 200.0 g L-1, at 3.0 L c.p. ha-1; and MSMA 720.0 g L-1, at 4.0 L c.p. ha-1) and an adjuvant (Nimbus®, mineral oil, 428.0 g L-1) at the rate of 0.3% of the solution volume. The plants in the treatments were evaluated visually by three people every three days, using a scale of grades of control. The plants were weighed every seven days after application of the herbicides to evaluate the percentage of water loss. The treatments MSMA, and MSMA combined with mineral oilpresented the best results for the control of dayflower weeds.