Coffee Science - v.13, n.2, 2018
URI permanente para esta coleçãohttps://thoth.dti.ufv.br/handle/123456789/10544
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Item Chemical control of Conyza canadensis (L.), in mixtures of herbicides with glyphosate in coffee crop(Editora UFLA, 2018-04) Silva, Carlos Alberto da; Miranda, Gustavo Rabelo Botrel; Alves, Alberto Donizete; Goulart, Roseli dos ReisThe 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 treatments were composed by CTU (no application), Glyphosate 1440g i.a ha-1, Glyphosate 1440g i.a ha-1 + Ethyl Chlorimuron 25g i.a ha-1, Glyphosate 1440g i.a ha-1 + Methyl Metsulfuron 6g i.a ha-1, Glyphosate 1440g i.a ha-1 + Flumioxazine 100g i.a ha-1, Glyphosate 1440g i.a ha-1 + Ethyl Carfentrazone 32g i.a ha-1, Glyphosate 1440g i.a ha-1 + Saflufenacil 56g i.a ha-1. In all treatments, non-ionic Dash adjuvant was used in the proportion of 1% of the application volume. Ten evaluations were carried out using the scores criterion, where 1 means efficiency between 0 and 20%; 2 from 21 to 40%; 3 from 41 to 60%; 4 from 61 to 80%; 5 from 81 and 100%. It is concluded the treatment Glyphosate 1440g i.a ha-1 + Saflufenacil 56g i.a ha-1 presented superior results from the first evaluation, evolving until the conclusion of this experiment.Item Conductivity to rust in coffee under different wooden and fruit tree intercropping systems(Editora UFLA, 2018-04) Chalfoun, Sara Maria; Martins, Carla de Pádua; Matos, Christiano Sousa Machado; Pereira, Alessandro Botelho; Silva, Vicentina NazaréThe coffee intercropping with fruit and wooden species of economic value has been presented as a viable alternative for coffee cultivation in order to mitigate adverse environmental conditions for coffee trees, among other factors. Adapting the crop management to the new conditions stablished by the system is fundamental to obtain success on intercropping. One of the most serious diseases for the crop is the rust caused by Hemileia vastatrix., which may have its severity increased in function of the microclimate conditions provided by the trees. In this sense, the disease behavior under different intercropping systems and consequent different need to adapt the control measures when compared to the cultivation in full sun should be investigated. The present study was conducted aimed to verify the impact of tree systems composed by three wooden species, Cedar (Acrocarpos fraxinifolius), African mahogany (Khaya ivorensis ), Teak (Tectona grandis ) and two species of fruit trees, avocado (Persea Americana) and macadamia (Macadamia integrifolia) planted in different spacing over the occurrence and evolution of rust.It was possible to observe that coffee rust began to progress in the coffee plants from the month of February reaching a peak in September in all the treatments. Differences were observed in the progress curves of the disease, especially in the species that presented larger canopy such as avocado. Further studies are suggested with the purpose of establishing the microclimatic changes provided by the cultivation of different wooden and fruit species in intercropping with coffee, according to the dynamics of the climate and their development.Item Interaction of K and B in the intensity of coffee rust in nutrient solution(Editora UFLA, 2018-04) Vasco, Gabriel Brandão; Pozza, Edson Ampélio; Silva, Marília Goulart da; Pozza, Adélia Aziz Alexandre; Chaves, EugênioThis study aimed at assessing the interaction of potassium (K) and boron (B) in the coffee rust intensity in a nutrient solution. The experiment which was performed in a greenhouse was set up in the randomized complete block design (DBC) with four replicates. The experimental unit involved a single vase with two Catuaí Vermelho (IAC 144) cultivars. The treatments included five doses of boron (0.05, 0.50, 1, 2 and 4 mg L-1 ) and five of potassium (4.0, 5.0, 6.0, 7.0 and 8.0 mmol L-1 ), totaling to 25 treatments in a factorial variance analysis. All the coffee seedling leaves were inoculated with Hemileia vastatrix. For the next 24 hours, the vases were covered with a black plastic bag, and left in the greenhouse to ensure favorable conditions for the fungal infection. A significant interaction was observed between the potassium (K) and boron (B) nutrients in coffee rust intensity. As the boron dose increased from 0.05 to 2.0 mg L-1 , the coffee rust intensity was observed to rise. From the 0.50 mg L-1 dose of B a drastic drop in the dry plant mass was observed, which reached zero index at the highest boron dose due to phytotoxicity.Item Does sulphur expel the coffee berry borer from Coffea arabica L. fruits?(Editora UFLA, 2018-04) Endo, Ricardo Tsuyoshi; Davi Junior, Salmo de Melo; Silva, Rafael Vinhal; Fernandes, Maria Elisa de Sena; Pereira, Renata Cunha; Teixeira, Adélio Barbosa; Fernandes, Flávio LemesTechnicians and insecticide retailers recommend adding sulfur to the insecticide mixture to expel coffee borer females (Hypothenemus hampei ) from the fruit. The objective in this study was to verify if sulfur expels the coffee borer from the fruit and what the cost associated with the use of sulfur in the insecticide mixture is. Perforated fruits were collected from coffee crops (Red Catuaí, IAC 144) during the granulation phase for the experiments and divided into two lots. The first lot was used to verify the effectiveness of sulfur to expel the borer, and the second to evaluate the effect of temperature x sulfur source x expelling effect on the borer. Sources of sulfur tested were: SK30 and Kumulus DF. The first experiment was the treatments: sulfur sources (two + control without sulfur), two plastic containers (open and closed), five repetitions (factorial: 3 x 2). The second were the treatments: sulfur sources, plastic containers and under two temperatures, factorial 3x2x2. The number of adult females that left the fruits within 24 and 48 h was evaluated. There was no difference in the number of females that abandoned the fruits between treatments with sulfur and control (P> 0.05). It was concluded that sulfur does not expel H. hampei from C. arabica fruits.Item Root-knot and lesion nematodes in coffee seedlings produced in the state of Minas Gerais, Brazil(Editora UFLA, 2018-04) Terra, Willian César; Silva, Júlio Carlos Pereira da; Campos, Vicente Paulo; Salgado, Sônia Maria de LimaUnderstanding the mechanisms of plant-parasitic nematodes (PPN) dispersion is vital to improve control strategies aiming to restrict dissemination of these plant parasites. In the present work, we evaluated the presence of PPN in Arabic coffee (Coffea arabica) seedlings produced in commercial nurseries in Minas Gerais, state, Brazil. A total of 2830 samples obtained from 318 coffee nurseries, in 84 counties within the South and Zona da Mata regions in Minas Gerais, Brazil and representing more than 62 million coffee seedlings, were analyzed. Meloidogyne spp. was identified in 11 samples from four counties. Pratylenchus spp. and Rotylenchulus reniformis were detected in 281 and 47 samples, respectively. According to the Regulatory Instruction N° 35 from the Ministry of Agriculture, Livestock and Food Supply (MAPA), in Brazil, coffee seedlings infected by Meloidogyne spp. are prohibited for commercialization and/or planting. However, such restrictions do not apply to other PPN. Therefore, seedlings sold in Minas Gerais may constitute sources of dissemination for root-lesion nematodes (Pratylenchus spp.) and the reniform nematode (R. reniformis).