Periódicos
URI permanente desta comunidadehttps://thoth.dti.ufv.br/handle/123456789/3352
Navegar
63 resultados
Resultados da Pesquisa
Item Effect of entomopathogenic fungi on the control of the coffee berry borer in the laboratory(Instituto Biológico, 2023-10-03) Ferreira, Juliana Silva; Andaló, Vanessa; Fuga, Cícero Augusto Guimarães; Sousa, Thaigoru Soares de; Soares, Carlos Marcelo SilveiraAmong the management and control tactics of the coffee berry borer Hypothenemus hampei (Ferrari), there is the use of entomopathogenic fungi. Due to the importance of prospecting isolates of entomopathogenic fungi for the control of the coffee berry borer, the objective of this study was to evaluate the efficiency of 26 isolates of entomopathogenic fungi in the control of this insect pest in the laboratory. The coffee berry borers were immersed in a solution adjusted to the concentration of 1 to 3 × 108 conidia/mL of each isolate and the control treatment (sterilized water). After seven days total mortality and confirmed mortality were evaluated. The isolates that caused the highest mortality and two commercial isolates were selected for evaluation of lethal concentration (LC50 and LC90) and lethal time (LT50 and LT90). Coffee berry borers were treated at different conidia concentrations for lethal concentration to assess total and confirmed mortality. For a lethal time, the coffee berry borers were treated at the concentration of 108 conidia/mL of the selected isolates, and, after two days and every 24 hours until the eighth day, the number of dead individuals was verified. Among the 26 isolates evaluated, 24 presented mortality higher than the control treatment, and three presented mortality higher than 85%. In the LC50 and LC90 assays, the IBCB 353 and IBCB 364 isolates were more lethal to H. hampei. In the LT50 and LT90 assays, the IBCB 66 and IBCB 353 isolates caused lethality in a shorter time.Item Physical and chemical attributes of beans damaged by the coffee berry borer at different levels of infestation(Instituto Agronômico (IAC), 2024-05-09) Silva, Sabrina Alves; Pereira, Rosemary Gualberto Fonseca Alvarenga; Chalfoun, Sara Maria; Teixeira, Alexandre ResendeThe physical and chemical attributes of coffee beans have a direct relation with the sensory quality of the beverage and the commodity’s market value. The coffee berry borer is a pest that causes a worldwide harm, and its infestation compromises bean health and composition. The objective of this study was to analyze the effect of infestation levels on beans physical and chemical parameters. Coffee samples were collected, and the damaged beans present in the samples were classified as to infestation level. The centesimal composition, color, quantification of bioactive compounds, and organic acids were evaluated. The L* and b* parameters of the CIELab color system were found to be significantly different between infestation levels. For chemical parameters, beans with major levels of infestation were found to differ from the others in the content of sugars, lipids, soluble solids, total titratable acidity, electrical conductivity, potassium leaching, succinic acid, and acetic acid. The presence of pests did not affect the bioactive compounds present in the coffee beans.Item Management strategies for Anredera cordifolia in coffee culture(Departamento de Engenharia Agrícola - UFCG, 2023-04-03) Silva, Paulo V. da; Ferrari, Andrea; Melo, Karolainy T. da S.; Dias, Roque de C.; Schedenffeldt, Bruna F.; Monquero, Patricia A.; Salmazo, Pedro A. V.; Medeiros, Elias S. de; Bicalho, Carolina C.; Mauad, MunirCoffee plantations installed at high altitudes and near forested areas have been highly infested with Anredera cordifolia. The objective of this work was to evaluate the effectiveness of different pre- and post-emergence herbicide treatments on A. cordifolia after mechanical mowing. A field experiment was carried out in a coffee plantation with natural infestation of A. cordifolia in a completely randomized design with a split-plot scheme and four replicates, in which the main plot an herbicides application and the subplot was the days after the initial application (DAI). The treatments were as follows: saflufenacil + glyphosate (70 + 960 g a.i. ha-1); chlorimuron + glyphosate (80 + 960 g a.i. ha-1); metsulfuron + glyphosate (6 + 960 g a.i. ha-1); flumioxazin + glyphosate (25 + 960 g a.i. ha-1), and glyphosate (960 g a.i. ha-1); with sequential application of glyphosate (960 g a.i. ha-1); glyphosate + indaziflam (960 + 75 g a.i. ha-1); indaziflam (75 g a.i. ha-1); and a control without herbicide application. Mechanical control, followed by the application of the treatments flumioxazin + glyphosate and metsulfuron + glyphosate in the first application and sequential application of indaziflam, proved to be effective. Control of this weed should be based on the removal of its plant residues from the field to reduce the regrowth and germination of aerial tubers.Item MGS Guaiçara and MGS Vereda: Coffea arabica cultivars resistant to the root-knot nematode Meloidogyne paranaensis(Crop Breeding and Applied Biotechnology, 2022-09-01) Abrahão, Juliana Costa de Rezende; Salgado, Sônia Maria de Lima; Fatobene, Bárbhara Joana dos Reis; Pereira, Antonio Alves; Botelho, Cesar Elias; Carvalho, Gladyston Rodrigues; Oliveira, Antônio Carlos Baião de; Ferreira, André Dominghetti; Figueiredo, Vanessa Castro; Vilela, Diego Junior Martins; Luz, Silvana Ramlow Otto Teixeira da; Andrade, Vinicius TeixeiraMGS Guaiçara e MGS Vereda are resistant to Meloidogyne paranaensis, one of the most aggressive nematode parasites of coffee. MGS Vereda is an early maturation cultivar, whereas MGS Guaiçara has a medium maturation cycle. Both cultivars produce red fruit, have high size, and high yield potential in infested areas.Item Temporal progress of coffee leaf rust and environmental conditions affecting severity in Veracruz State, Mexico(Universidade Federal de Lavras, 2023-03-28) Pale-Ezquivel, Ivan; Lagunes, Ricardo Musule; Pineda-López, Maria del Rosario; Alarcón-Gutiérrez, Enrique; Sánchez-Velásquez, Lázaro RafaelCoffee is an important crop in Mexico. Unfortunately, coffee production has been affected by coffee leaf rust (CLR). For Veracruz, the second state in Mexico with the major production of coffee, there are available reports of weekly CLR severity, but these are only informative without in-depth inferential analysis. We analyzed variations of CLR severity along the year in Veracruz with data from municipal weekly reports provided by Mexico’s federal government phytosanitary epidemiological monitoring coffee program. We selected reports dated in 2018 from nine municipalities and after calculations of mean monthly severity values, we conducted a one-way ANOVA (months as factors) of severity data. We compared this information with other coffee-producing regions. Additionally, we explored the association of temperature, rainfall, and altitude with CLR severity using Principal Component Analysis and multiple linear regressions. Temperature and rainfall data were obtained from Mexican National Meteorological Service. We found that CLR severity in October, November, December, and January (months of harvest period) was significantly higher than values from March-June. During the harvest period, coffee plants allocate resources mainly for fruiting which competes in resources for other tasks such as defense and leaf growth, so this competition of resources can explain the positive relationship found between fruit load and CLR severity. This monthly variation of severity was similar to those reported in Chiapas, Guatemala, Colombia, Uganda, and Ethiopia. Our model (R2 = 0.948) showed a significant and negative effect of minimum and maximum temperature (in a range from 9.9 – 15.5 °C and 18.5 – 26.5 °C, respectively) on CLR severity, while the effect of rainfall (in a range from 32.0 – 359.9 mm) and médium temperature (from 14.3 – 20.5 °C) was positive. With our study, we suggest applications of fungicides in March-June when coffee plantations are in leaf phenophase.Item Evaluation of a prototype of soil thermal solarizer for control of gall nematode in the production of coffee seedlings(Universidade Federal de Lavras, 2023-02-23) Uchôa, Francisco Paiva; Vieira Junior, José Roberto; Fernandes, Cléberson de Freitas; Rocha, Rodrigo Barros; Espíndula, Marcelo Curitiba; Rudnick, Vaneide Araújo de Sousa; Silva, Dvany Mamedes da; Freire, Tamiris Chaves; Sangi, Simone Carvalho; Mariobo, Solange Aparecida RodriguesIn coffee crops at Rondônia State of Brazil, there is an increase in phytonematode epidemics.Since most local coffe nurseries at Rondônia use soil as substrate for seedling production, this work aimed to test the minimum exposure time at 60 ºC to control of root-knot nematodes Meloidogyne incognita in soil by means of solar heating, using a solarizer, in an adapted version for better heating perfomance. The used solarizer prototype was built of a wooden box covered with metal sheets, thermal blankets, painted black, with aluminum pipes of 0.5 cm in diameter at the bottom of the box that circulates the water heated by the collector box. The soil was inoculated with a suspension of 1000 eggs + J2 of M. incognita per liter and placed in equipment with a capacity of 150 liters. Exposure times at a minimum temperature of 60 °C were evaluated, with 14 treatments: C1 (non-inoculated and not autoclaved), C2 (inoculated), C3 (non-inoculated and autoclaved) T0’, T15’, T30’, T45’, T60’, T180’, T360’, T720’, T1440’, T2880’ and T4320’ . The temperature was measured every 15 minutes using a skewer-type digital thermometer. The soil was removed according to the exposure time, and placed in 8-liter pots, in which clone 125 and BRS 2357 coffee seedlings, susceptible to M. incognita , were transplanted and growing in a greenhouse for 180 days. The experimental design used was DIC, with 6 replications, each seedling as na experimental unit. Reproduction factor (FR), number of eggs per plant (NOGR) and number of galls per gram of root (NGGR) were evaluated. The FR, NOGR and NGGR variables reduced with exposure time. All treatments showed an effect to control the population of M. incognita in infected soils, with 100% efficacy of pathogen eradication from the T45’ treatment, 60 minutes of exposure is recommended for the production of Coffea canephora seedlings. Taken together, thir work showed the high potential of thr solorizer to contribute in the root-knot nematode control to seedling production.Item Biocontrol of root-knot nematode Meloidogyne incognita in arabica coffee seedling by using fortified bacterial consortium(Universidade Federal de Lavras, 2023-01-11) Pradana, Ankardiansyah Pandu; Hoesain, Mohammad; Asyiah, Iis Nur; Adiwena, Muh; Budiman, Aris; Yousif, Ahmed Ibrahim AlrashidThe damage caused by the southern root-knot nematode (Meloidogyne incognita) in coffee plants has been reported in various countries, including Indonesia. The measures to control the nematodes on coffee seedlings and fields depend on synthetic nematicides. Addressing this issue requires not only a more environmentally friendly and cheaper technology but also equal effectiveness comparable to synthetic nematicides. This study aimed to test the effectiveness of fortified bacterial consortium (FBC) involving a combination of liquid organic fertilizer (LOF), botanical pesticide, and a bacterial consortium to control M. incognita infection in Coffea arabica seedlings. The treatments in this study consisted of control, synthetic nematicide with the active ingredient fluopyram, and various FBC concentrations ranging from 20%, 40%, 60%, 80%, and 100%. The results demonstrated that the application of 60% to 100% FBC increased plant growth. The most effective and efficient treatment for increasing plant growth was the application of 60% FBC. When compared with control plants, 60% FBC treatment resulted in 6.8% longer root, 9.5% higher plant, 5.3% heavier plant fresh weight, and 4.8% heavier root fresh weight. We also found that the application of 60% to 100% FBC increased the amount of chlorophyll in leaves. FBC application also reduced the number of nematodes in the soil up to 60.6%, the number of galls up to 286.4%, and the severity of root damage up to 118.2%. This study indicates that the application of 60% FBC is the most effective and efficient in controlling M. incognita and stimulating the growth of C. arabica seedlings.Item Management of coffee leaf rust using L-glutamic acid biofertilizer combined with fungicide(Universidade Federal de Lavras, 2022-12-28) Cabral, Samanta Aparecida Cristiano; Mafra, Natália Moreira; Carvalho, Beatriz Fagundes de; Rezende, Dalilla CarvalhoThe use of biofertilizers is a potential tool for the management of crop diseases. Coffee leaf rust, which is commonly controlled by triazole and strobilurin fungicides, is one of the main phytosanitary challenges associated with coffee cultivation. However, the indiscriminate use of such fungicides may be harmful to the environment and human health, in addition to having a negative impact on coffee exports. The aim of this study was to evaluate the effect of foliar application of L-glutamic acid on the incidence and severity of coffee leaf rust in the southern region of Minas Gerais, Brazil. A biofertilizer made of sugarcane molasses fermented by the bacterium Corynebacterium glutamicumwas used in combination with 25% L-glutamic acid and a fungicide of the triazole group registered for crops. The experimental design adopted was randomized blocks with four replications (eight plants per replicate) and seven treatments: fungicides, control test, 0.8 L ha-1 of biofertilizer, combinations of 0.04, 0.06, 0.08, and 0.1 L ha-1 of biofertilizer and fungicide.Three treatments were initially applied in a preventive way, before the rainy season, and then at intervals of 60 days. After seven months of treatment, we observed that coffee leaf rust incidence was significantly lower in coffee plants treated with combined products when compared to treatments of either fungicide or biofertilizer only, with a reduction of 56% and 45%, respectively, being observed. Among the combinations of biofertilizer and fungicide, coffee leaf rust incidence reduced with an increase in the biofertilizer dose, such thatthe disease incidence in plants treated with a dose of 0.1 L ha-1was 58% lower than that in plants treated with fungicide only. No differences in disease severity were observed among the treatments. In conclusion, the use of a combination of biofertilizer and fungicide is more effective for the management of coffee leaf rust than the use of the isolated products.Item Resistance of Coffea canephora as a sustainable tool for Meloidogyne incognita control(Universidade Federal de Lavras, 2022-12-29) Silva, Dvany Mamedes da; Vieira Júnior, José Roberto; Rocha, Rodrigo Barros; Espindula, Marcelo Curitiba; Rudnick, Vaneide Araújo de Sousa; Fernandes, Cléberson de Freitas; Uchôa, Francisco Paiva; Bastos, Jéssica Silva Felix; Freire, Tamiris Chaves; Sangi, Simone Carvalho; Fonseca, Aline Souza daMany factors can affect coffee production, such as the root-knot nematode, a soil pathogen that can kill plants up to two years old. In infested areas, the cultivation of resistant genotypes is an economical and ecologically appropriate alternative. The present study aims to evaluate the resistance of Coffea canephora clones to Meloidogyne incognita. Evaluations were carried out in a greenhouse at Embrapa Rondônia (Porto Velho -RO) between September 2019 and November 2020. Genotypes were inoculated with M. incognita in four experiments with six replications with a completely randomized design. Root dry weight (RDW), the number of galls (NG) and the reproduction factor (RF) were evaluated. Eighty-six coffee clones were evaluated, with 50 clones showing resistance to Meloidogyne incognita and 36 clones showing susceptibility. Clones classified as resistant had an average reproduction factor of 0.33 with a range of 0.00 to 0.95, while clones classified as susceptible had an average reproduction factor of 3.48 with an amplitude ranging from 1.02 to 14.46. The number of galls was also higher in susceptible clones than in resistant clones. Considering the ten most cultivated clones, the genotypes GJ8, GJ25, P50, SK80, AS2, P42 and LB10 were classified as resistant, and the genotypes GJ3, GJ5 and SK41 were classified as susceptible. Taken together, the results identify resistant C. canephora clones as an important and sustainable tool for controlling M. incógnita.Item Doenças associadas à Xylella fastidios no Brasil(Sociedade Brasileira de Fitopatologia (SBF), 2022) Carvalho, Isis Gabriela Barbosa; Esteves, Mariana Bossi; Froza, Joyce Adriana; Kleina, Heloisa Thomazi; Souza Neto, Reinaldo Rodrigues de; Souza, Alessandra Alves de; Coletta-Filho, Helvécio DellaCom base em informações genômicas, a bactéria Xylella fastidiosa é classificada em três principais subespécies: fastidiosa, multiplex e pauca. Essas diferentes subespécies são transmitidas naturalmente por meio de insetos vetores, conhecidos como cigarrinhas, que se alimentam da seiva dos vasos do xilema das plantas, local de colonização da bactéria. Devido, principalmente, à obstrução no transporte de água e sais minerais nesses vasos condutores, a bactéria X. fastidiosa ocasiona sérias doenças em diferentes culturas de interesse econômico. No Brasil, esse fitopatógeno foi detectado, pela primeira vez, em ameixeira, cultura na qual a subespécie multiplex é responsável pela doença conhecida como escaldadura das folhas da ameixeira (EFA). Posteriormente, a subespécie pauca foi reportada como responsável pela clorose variegada dos citros (CVC), em plantas de laranjeiras doces no estado de São Paulo. A subespécie pauca também foi encontrada em plantas de café, no mesmo Estado, ocasionando a atrofia dos ramos do cafeeiro (ARC), doença cujos danos ainda não foram bem quantificados. Recentemente, a subespécie pauca também foi encontrada em oliveiras ocasionando a síndrome do dessecamento foliar das oliveiras (SDFO), relatada em olivais no Sudeste brasileiro, especialmente na região da Serra da Mantiqueira. Nessa revisão foram abordados aspectos específicos dessas doenças, assim como medidas que podem ser adotadas como manejo.