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Search Results: 1 - 10 of 273694 matches for " Paulo Estev?o de;Pozza "
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Influência das variáveis ambientais no progresso da antracnose do feijoeiro e eficiência de tiofanato metílico + clorotalonil no controle da doen?a
Garcia, Alvanir;Souza, Paulo Estevo de;Pozza, Edson Ampélio;Santos, Florisvalda da Silva;
Ciência e Agrotecnologia , 2007, DOI: 10.1590/S1413-70542007000600016
Abstract: in minas gerais the anthracnose is one of the most important leaf diseases of the common bean due to occur at various planting time and to reduce the production. the present experiment was performed aiming to evaluate occurrence, progress of the disease and the efficiency of fungicide on the control of bean anthracnose. plots with and without fungicide treatment (thiophanate methyl + chlorothalonil, 240 + 600g a. i./ha) were evaluated in five times of evaluation during 24 sowing times of bean cultivar carioca, between april/96 and march/97. the occurrence of the anthracnose was not verified during february and march of 1997. treatment with fungicide resulted in the lower disease severity and higher yield, mainly in the months of higher severity of the disease. there was significant correlation between the severity and the maximum and minimum temperature and relative humidity 43, 57 and 71 days after emergency. there was a negative correlation between severity of the disease and yelds.
Progresso da ferrugem e da cercosporiose em cafeeiro (coffea arabica l.) Com diferentes épocas de início e parcelamentos da fertirriga??o
Talamini, Viviane;Pozza, Edson Ampélio;Souza, Paulo Estevo de;Silva, Antonio Marciano da;
Ciência e Agrotecnologia , 2003, DOI: 10.1590/S1413-70542003000100017
Abstract: evaluations of incidence of rust (hemileia vastatrix berk. & br.) and brown eye spot (cercospora coffeicola berk. & cooke) took place at intervals of 14 days, observing 6 leaves per plant during the period from march 21, 1998 to february 6, 1999 in a 'catuai' culture. the objective was to evaluate the effect of irrigation and fertirrigation on the incidence of rust and in 12 year coffee plants and analyze the progress curve of these diseases and their correlation to climatic variables. the experimental design was the one of randomized blocks with four treatments of different fertilizer splitting (1: 12 hand applications, 2:12 applications via fertirrigation, 3: 24 fertirrigated applications, 4: 36 fertirrigated applications). the plots were divided in 3 subplots that received treatments in different periods at initial irrigation (subplots a: june 1, b: july 15, c: september 1), and 2 checks (additional treats 1: fertilized 4 times and not irrigated, additional treats 2: conventional fertilizer and not irrigated). the area under disease progress curve (audpc) was calculated and submitted to variance analysis and tukey's test at 5% probability. for the coffee rust, no treatment was significant. curve progress showed maximum incidences in the months of july and september. there was a significant correlation at 1% probability among all the treatments and climatic variables, with the exception of the maximum temperature. for brown eye spot, the treatments attributed to the plots and to the subplots were significant at 1% of probability. however, the interaction between the two was non-significant. greater audpc in splitting fertilizer 2 and 4 was observed. in the subplots, greater audpc in check e following for d was observed. curve progress showed maximum incidences from may to july. there was a significant correlation of brown eye spot incidence in the majority of the treatments in relation to climatic variables.
Metodologias de inocula??o de Rhizoctonia solani na cultura da cenoura
Oliveira, Amanda Cabral Corrêa de;Souza, Paulo Estevo de;Pozza, Edson Ampélio;Manerba, Felipe de Carvalho;Lopes, Maurício Ferreira;
Ciência e Agrotecnologia , 2008, DOI: 10.1590/S1413-70542008000300044
Abstract: rhizoctonia solani may cause different diseases in carrot (daucus carota l.). to test control methods, artificial inoculation is generally employed. this work aimed to adjust a methodology to inoculate r. solani (ag-4) in carrot. a randomized block outline with five replicates was used, with an experimental unit of a 3l-pot with 40 seeds and a substact composed by a mixture of soil/sand (3:1 v/v). treatments were those in a factorial experiment 4 x 3, with 4 inoculum densities (9; 18; 36; 72 mg of inoculum.kg-1 of soil) and three forms of artificial infestation (incorporated to the substract as a whole; incorporated on the surface; with direct contact with seeds) and an additional control. the experiment was carried out in a growth chamber at 200c and a 12h photoperiod. the evaluations were daily performed from the 8th to the 30th day after sowing, recording plant stand and number of seedlings with damping-off. the emergence index, averge percentage of pre and post emergence. were analyzed the density of 72 mg of inoculum·kg-1 of soil, incorporated on the surface of the susbtract was the most efficient inoculation method.
Efeito de variáveis ambientais, épocas e métodos de plantio na intensidade da seca da haste (Botrytis cinerea) em Hibiscus sabdariffa
Oliveira, Carlos Alberto de;Souza, Paulo Estevo de;Pozza, Edson Ampélio;Pinto, José Eduardo Brasil Pereira;Barretti, Patrícia Baston;
Summa Phytopathologica , 2011, DOI: 10.1590/S0100-54052011000200003
Abstract: the aim of the present study was to evaluate the effect of temperature (15, 20, 25 and 30oc), leaf wetness period (0, 6, 12 and 24 h), and planting time (september, october, november and december) and method (direct sowing and transplanting) on the intensity of stem blight (botrytis cinerea) in hibiscus sabdariffa. environmental variables were evaluated under controlled conditions with artificial inoculation, while planting times and methods were assessed under natural infection conditions in the field with natural inoculation. infection frequency data, analyzed as area under the progress curve of infection frequency (aupcf), and lesion length related to the environmental variables were subjected to analysis of variance and regression; then, response surfaces were plotted. incidence data (aupci) related to planting times and methods were subjected to analysis of variance using the statistical program sisvara/ufla. the interaction of temperature and leaf wetness period influenced the infection frequency and the length of stem blight lesions, which increased with the increase in leaf wetness period and with the decrease in temperature. lesions were larger at 15oc and 24 hours of leaf wetness. in the absence of leaf wetness, symptoms manifested only at 15oc. at 30oc, longer leaf wetness periods were required for symptoms to manifest. there was a significant interaction of planting times and methods on the disease incidence. stem blight incidence was lower in seedling transplanting compared to direct sowing at all planting times. there was an increase in incidence due to the delay in planting time with both methods. thus, there was a direct relationship between decrease in temperature and increase in stem blight incidence.
Freqüência de ocorrência de agentes etiológicos, sintomas e origem de amostras do cafeeiro catalogados em 12 anos de clínica fitossanitária da UFLA
Garcia Júnior, Daniel;Pozza, Edson Ampélio;Souza, Paulo Estevo de;Talamini, Viviane;Pozza, Adélia Aziz Alexandre;Castro, Hilário Ant?nio de;Souza, Ricardo Magela de;Abreu, Mário Sobral de;Pfenning, Ludwig Heinrich;
Ciência e Agrotecnologia , 2003, DOI: 10.1590/S1413-70542003000100021
Abstract: the phytossanitary clinic of the federal university of lavras, situated in the south of the state of minas gerais has given support to coffee producers providing diagnoses of biotic and abiotic diseases, to generate subsidies to minimize losses in production of this crop. during the last twelve years, 378 samples have been analyzed. fungi were detected in 78,6% of the samples. the major fungi found were colletotrichum sp. (29%), rhizoctonia solani (18%), cercospora coffeicola (13%), phoma sp. (13%), e fusarium sp (11%). other incidences were caused by phytotoxity, mineral deficiency and bad formation of the roots. due to the location of the phytossanitary clinic, most of the samples came from locations of south of minas gerais (63%), followed by triangulo mineiro (12%) and zona da mata (10%).
Progresso da cercosporiose (Cercospora coffeicola Berkeley & Cooke) em cafeeiros sob cultivos organico e convencional
Santos, Florisvalda da Silva;Souza, Paulo Estevo de;Pozza, Edson Ampélio;Miranda, Júlio César;Barreto, Sarah Silva;Theodoro, Vanessa Cristina;
Summa Phytopathologica , 2008, DOI: 10.1590/S0100-54052008000100009
Abstract: the progress of brown eye spot in coffee trees in both organic and conventional crop systems was evaluated in two neighboring fields, in santo ant?nio do amparo city, mg, between nov./2003 and nov./2005. the fields are under similar weather, soil and relief conditions and made up of ten-year-old coffee trees cv. acaiá mg-474-19. the incidence of brown eye spot was significantly higher in conventional system, whose average from two years demonstrated the area under the disease progress curve (3.905) higher than organic system (2.529). that was also demonstrated by the higher incidence on leaves (maximum 28% in 2004 and 29% in 2005) on conventional than on organic system (9% and 12%, respectively). the incidence on fruits was 18.2% in 2004 and 22% in 2005, while on organic system it was 11.5% and 15%, respectively. this higher susceptibility to disease on coffee trees in conventional system coincided with lower foliar content of calcium and magnesium for the fruit filling and fruit ripening stages compared with to the organic system. that was a consequence of higher production of the conventional system that resulted in yield 47.8% higher than organic one in 2004 (high number of berries). in 2005, the yield was similar in both crop systems but it was verified that the conventional production in 2005 was 64% lower than in 2004 whereas in the organic system from the difference in yield was 34%. this suggested for a tendency of lower effect of the disease in the following coffee harvest of the organic system compared to the conventional one.
Aduba??o organica, nutri??o e progresso de cercosporiose e ferrugem-do-cafeeiro
Santos, Florisvalda da Silva;Souza, Paulo Estevo de;Pozza, Edson Ampélio;Miranda, Júlio César;Carvalho, Eudes Arruda;Fernandes, Luiz Henrique Monteiro;Pozza, Adélia Aziz Alexandre;
Pesquisa Agropecuária Brasileira , 2008, DOI: 10.1590/S0100-204X2008000700001
Abstract: the objective of this work was to evaluate the effect of organic nutrional sources on the progress of brown eye spot and coffee rust in coffee plants, between november 2003 and november 2005. the experimental design adopted was the randomized blocks, with four replications and six treatment plots: coffee fruit peel + swine waste (cp+sw); castor bean presscake + crotalaria (cbp+cr); coffee fruit peel (cp); bovine manure + crotalaria (bm+cr); coffee fruit peel + castor bean presscake (cp+cbp); and standard fertilization used in the farm, which combines compost, castor bean presscake, swine waste and crotalaria (control). the higher area under the incidence progress curves of brown eye spot and coffee rust was obtained by cp treatment (respectively 62 and 38% higher to control). the larger progress coincided with the increase in leaf potassium and decrease of calcium content in cp, compared to other nutrient sources, and it resulted in higher leaf drop and lower yield. cp+cbp and cp+sw reduced in 38% the brown eye spot incidence, and in 31 and 21%, respectively, the coffee rust incidence, and increased leaf calcium content during fruit filling, compared to cp. the better nutritional status of plants increased resistance to diseases and reduced the variation between 2004 and 2005 harvests.
Dez anos da clínica fitossanitária da UFLA - freqüência da ocorrência de patógenos, sintomas e principais hospedeiros
Talamini, Viviane;Pozza, Edson Ampélio;Souza, Paulo Estevo de;Garcia Júnior, Daniel;Castro, Hilário Ant?nio de;Souza, Ricardo Magela de;Abreu, Mário Sobral de;
Ciência e Agrotecnologia , 2003, DOI: 10.1590/S1413-70542003000100008
Abstract: this work had as objective analyzes the diagnoses accomplished at the plant disease clinic of the plant pathology department at the federal university of lavras, between 1990 to 1999. eighty five hosts were analyzed, in 1429 samples. the fungus with 70.5%, the bacteria with 12.9% and the viroses with 1.2% were the etiologic agents found more frequently. the fungi etiologic agent of larger occurrence was the genera fusarium associated to 25.5% of the diseases, followed by colletotrichum (16%), rhizoctonia (11%), alternaria (5%), cercospora (4%), helminthosporium (3.5%) and phoma (3%), the other fungi agents represented 31% of the samples. the bacterial etiologic agent of larger occurrence was the erwinia genera with 35% of samples, followed to genera streptomyces (30%), ralstonia (13,5%), pseudomonas (11.5%), xanthomonas (9.5%) and agrobacterium (0.5%). the leaves spots were the symptoms of larger occurrence, with 40% of the samples, followed by wilts (22%), cankers and scab (17%), rots (14%) and damping-of (3%). concernings the hosts, the vegetables stood out with 27% of the occurrences, the grains with 24%, the tropical fruits with 17%, the ornamental ones with 15%, the temperate fruits with 3%, forage with 2%, oleaginous with 2% and other with 10%.
Intensidade da ferrugem do cafeeiro fertirrigado
Miranda, Julio César;Souza, Paulo Estevo de;Pozza, Edson Ampélio;Faria, Manoel Alves de;Santos, Florisvalda da Silva;Barreto, Sarah da Silva;Silva, Mirian de Lourdes Oliveira e;
Ciência e Agrotecnologia , 2006, DOI: 10.1590/S1413-70542006000500010
Abstract: the coffee planting today has been adopting new technologies to manage and manipulate the farming, such as irrigation and fertirrigation, in order to increase productivity and consequently the profits. this work aimed at evaluating the effects of different irrigation depths and fertilizer splitting by fertirrigation under a drip irrigation system on the progress of the rust and productivity in coffee trees. the research was set at the experimental area of the federal university of lavras (ufla), with six-year-old coffee trees cultivar acaiá cerrado mg-1474, (coffea arabica l.) with distance between lines of 0,6 x 3,0 m. the experimental design was developed in randomized blocks with four repetitions. the treatments were formed by five levels of plots representing irrigation depths corresponding to the values of 0%, 40%, 60%, 80% and 100% of evaporation of the class "a" tank (eca), and three subplots of nitrogen and potassium fertilizer splitting in 3, 6 and 9. this work evaluated the incidence and severity rate of rust in leaves, percentage of leaf number increasing and coffee plants productivity. it was verified that the severity of the rust was influenced by the interaction between irrigation depths and fertilizer splitting. there was more severity of the rust in the fertilizer splitting in 3 and 9 using irrigation depths 0% and 60% eca.
Comparison and validation of diagrammatic scales for brown eye spots in coffee tree leaves
Custódio, Adriano Augusto de Paiva;Pozza, Edson Ampélio;Guimar?es, Sarah da Silva Costa;Koshikumo, érika Sayuri Maneti;Hoyos, Julián Maurício Agredo;Souza, Paulo Estevo de;
Ciência e Agrotecnologia , 2011, DOI: 10.1590/S1413-70542011000600005
Abstract: a diagrammatic scale with six levels (0.1-3.0; 3.1-6.0; 6.1-12.0; 12.1-18.0;18.1-30.0; 30.1-49.0%) was developed, compared, and evaluated along with two other scales to measure the severity of brown eye spots in coffee trees leaves. the scale was designed based on two others already in use in order to increase the efficiency of evaluation and for estimation values to approach as close as possible to their actual values. two evaluations were performed using each of the three diagrammatic scales and one was performed without a diagrammatic scale, in seven day intervals. using the proposed scale, the evaluators demonstrated better precision levels, accuracy, reproducibility, and repeatability in the estimations, when compared to the evaluators who did not use the diagrammatic scale, or who used existing scales. the proposed diagrammatic scale provided a reliable estimation to evaluate brown eye spot severity on coffee tree leaves.
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