oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 530 )

2018 ( 846 )

2017 ( 770 )

2016 ( 1129 )

Custom range...

Search Results: 1 - 10 of 479487 matches for " Luiz A.;Mizubuti "
All listed articles are free for downloading (OA Articles)
Page 1 /479487
Display every page Item
Avalia??o de fungicidas para o controle de Colletotrichum gloeosporioides em cebola
Haddad, Fernando;Maffia, Luiz A.;Mizubuti, Eduardo S. G.;
Fitopatologia Brasileira , 2003, DOI: 10.1590/S0100-41582003000400016
Abstract: foliar anthracnose caused by colletotrichum gloeosporioides is the most important onion (allium cepae) disease in guiricema and guidoval-mg. fungicides, mostly benomyl (ben), are intensively sprayed for disease control but they have been inefficient. we tested the hypothesis of occurrence of resistant isolates of c. gloeosporioides to ben and compared fungicides for pathogen control. conidial germination of the isolates decreased as ben concentration increased and the fungicide completely prevented mycelial growth. for all pathogen isolates tested, disregarding fungicide concentration, methyl thyophanate (mt) + mancozeb (man), man, chlorothalonil (chl), ben+man, tm+clo, captan (cap), and prochloraz (pro) inhibited germination. all fungicide treatments but chl, completely halted mycelial growth. under greenhouse conditions each treatment was sprayed on onion 'texas early grano 502' (teg502) plants and the fungus was inoculated 24 h later. the most efficient treatments in reducing disease intensity were mt+man, mt+chl, ben+man, man, cap, chl, ben, and pro. ben, tm, pro or car was sprayed immediately after, or two, four, or six days after pathogen inoculation in plants of teg502. ben and pro were the most efficient when sprayed right after inoculation; no fungicide controlled the disease at the other spray times.
Avalia o de fungicidas para o controle de Colletotrichum gloeosporioides em cebola
Haddad Fernando,Maffia Luiz A.,Mizubuti Eduardo S. G.
Fitopatologia Brasileira , 2003,
Abstract: A antracnose foliar causada por Colletotrichum gloeosporioides é a doen a mais importante da cebolicultura (Allium cepae) em Guidoval e Guiricema, MG. Para controle da doen a, utilizam-se intensivamente fungicidas, principalmente benomil (Ben), o que tem sido pouco efetivo. Neste trabalho, testou-se a hipótese da existência de isolados de C. gloeosporioides resistentes ao Ben e se comparou a eficiência de diferentes fungicidas no controle do patógeno. Nas concentra es testadas, Ben impediu o crescimento micelial do fungo, e a germina o de conídios decresceu com o aumento da concentra o do produto. Independente do isolado do patógeno e da concentra o dos fungicidas, ocorreu maior inibi o da germina o com Tiofanato metílico (Tm) + Mancozeb (Man), Man, Clorotalonil (Clo), Ben+Man, TM+Clo, Captan (Cap) e Procloraz (Pro). Excetuando-se Clo, os demais tratamentos inibiram totalmente o crescimento micelial do fungo. Em casa de vegeta o, pulverizaram-se os diferentes tratamentos em plantas de cebola 'Texas Early Grano 502' (TEG502) e 24 h após inoculou-se o patógeno. Maior redu o na intensidade da doen a ocorreu com TM+Man, TM+Clo, Ben+Man, Man, Cap, Clo, Ben e Pro. Em plantas de TEG502, pulverizaram-se diferentes fungicidas imediatamente após, dois, quatro ou seis dias após inocula o do patógeno. Na pulveriza o imediatamente após a inocula o, Ben e Pro foram os mais eficientes; nas demais épocas, nenhum fungicida reduziu a severidade da doen a.
Componentes de resistência em cebola a Colletotrichum gloeosporioides
Pedrosa, Raquel A.;Maffia, Luiz A.;Mizubuti, Eduardo S. G.;Brommonschenkel, Sérgio H.;
Fitopatologia Brasileira , 2004, DOI: 10.1590/S0100-41582004000600002
Abstract: despite the importance of onion (allium cepa) leaf anthracnose caused by colletotrichum gloeosporioides in latin america, africa, and asia, few studies have focused on host resistance to the pathogen. therefore, in this study, resistance components of two cultivars and eight accessions of onion to four isolates of c. gloeosporioides were evaluated under greenhouse conditions. inoculations were performed either by spraying inoculum suspension or by placing a mycelial disc on the leaf. the cultivars and accessions differed significantly regarding initial infection frequency and monocyclic progress rate (rg) with the spray-inoculation, and regarding incubation period and lesion area with the mycelial-disc inoculation. correlation coefficient (r) values were estimated between the components with the mycelial disk inoculations. values of r were 0.98 between disease severity visually assessed nine days after inoculation (sev9) and area under the disease progress curve (audpc), 0.80 between sev9 and disease severity assessed with the leaf area meter (sev), 0.72 between sev9 and rg, 0.64 between sev9 and infection frequency nine days after inoculation, 0.81 between sev and audpc, and 0.64 between sev and rg. considering both the significant r values associated with sev9 and that to estimate sev9 there is no need of rating diagrams, this component is potentially useful to evaluate onion germplasm against c. gloeosporiodes. the spray inoculation procedure was faster, simpler, and provided higher infection efficiency and lower variability than the mycelial disk inoculation technique. therefore, this should be the preferred inoculation procedure when assessing onion germplasm.
Avalia o da silagem de baga o de laranja e silagem de milho em diferentes períodos de armazenamento = Ensilage evaluation of orange peel and corn silages in different storage times
Andréa Pereira Pinto,Ivone Yurika Mizubuti,édson Luiz de Azambuja Ribeiro,Rubens Fey
Acta Scientiarum : Animal Sciences , 2007,
Abstract: Objetivou-se avaliar alguns parametros de qualidade da silagem de baga o de laranja e silagem de milho em diferentes períodos de armazenamento dos silos. Foram preparados minisilos, com capacidade para 3,6 kg, em delineamento experimental inteiramente casualizado, distribuídos em arranjo fatorial 2 x 6, sendo dois tipos de silagem(baga o de laranja ou milho) e seis períodos de armazenamento (10, 30, 50, 70, 90 e 110 dias), com três repeti es. Determinaram-se as características químicas, parametros de fermenta o e digestibilidade in vitro (DIV). O teor médio de matéria seca (MS) da silagemde baga o de laranja (SBL) foi de 26,5%. Apesar de a SBL apresentar maior capacidade tamp o do que a silagem de milho (SM), houve maior produ o de ácido lático nas SBL. A SBL e SM apresentaram pH de 3,5 e 3,9, respectivamente, com dez dias de ensilagem. A SBL apresentou maior DIV, quando comparado à silagem de milho. Conclui-se que asilagem de baga o de laranja apresentou bom padr o de fermenta o, quando os teores de MS estavam ao redor de 26%, podendo ser utilizada a partir de dez dias de ensilagem. A SBL possui elevada DIV, sendo boa alternativa nos períodos de escassez de alimentos. This study evaluated quality parameters of orange peel and corn silages in different silo storage times. Experimental mini-silos, with capacity for 3.6 kg were prepared in a completely randomized design, distributed in a 2 x 6 factorial arrangement, consistingof two silages (orange peel or corn) and six opening times (10, 30, 50, 70, 90 and 110 days), with three replications. The chemical characteristics, fermentation parameters and in vitro digestibility (IVD) were determined. The dry matter (DM) average of orange peel silage (OPS) was 26.5%. Even though OPS presented higher buffering capacity than corn silage (CS), there was greater lactic acid production in OPS. Orange peel silage and corn silage presented pH after ten days of ensilage of 3.5 and 3.9, respectively. OPS presented greater IVD when compared to corn silage. It can be concluded that orange peel silage achieved a good fermentation pattern when ensiled with DM around 26%, being ready to be openedafter ten days of ensilage. The orange peel silage has high IVD, becoming a good alternative for periods of food shortage.
Evaluation of orange peel and corn silages with different protein additives Avalia es das silagens de baga o de laranja e de milho com diferentes aditivos protéicos
Andréa Pereira Pinto,Ivone Yurika Mizubuti,Edson Luiz de Azambuja Ribeiro,Elzania Sales Pereira
Semina : Ciências Agrárias , 2012,
Abstract: Experimental mini-silos were prepared, in a completely randomized design distributed in a 2 x 5 factorial arrangement, with two silages (orange peel and corn) and five treatments (without protein source; with urea; soybean meal; cotton seed meal and sunflower meal). The protein additives were added to each silage to achieve about 10% protein. The silos were opened 90 days after the make silages. The following determinations were accomplished: pH, lactic acid (LA), buffering capacity (BC), dry matter (DM), crude protein (CP), neutral detergent fiber (NDF), calcium (Ca), total carbohydrates (TC), non fibrous carbohydrates (NFC) and in vitro digestibility (IVD). The protein additives increased the DM averages of the silages. The pH of silages varied from 3.41 to 3.95, being the lactic acid and in vitro digestibility higher to the orange peel silage when compared to the corn silage. It can be concluded that the orange peel silage to be preserved in silage form with protein source. Foram preparados minisilos experimentais, em delineamento experimental inteiramente casualizado, distribuídos em arranjo fatorial 2 x 5, sendo, 2 tipos de silagem (baga o de laranja e milho) e 5 tratamentos (sem fonte protéica; com uréia; farelo de soja; farelo de algod o e farelo de girassol). Os aditivos protéicos foram adicionados para que cada silagem obtivesse um teor protéico ao redor de 10%. Os silos foram abertos 90 dias após o preparo das silagens. Foram determinados pH, ácido lático (AL), capacidade tamp o (CATP), matéria seca (MS), proteína bruta (PB), nitrogênio amoniacal (NNH3), extrato etéreo (EE), fibra em detergente neutro (FDN), cálcio (Ca), carboidratos totais (CT), carboidratos n o fibrosos (CNF) e digestibilidade in vitro (DIV). Os aditivos protéicos aumentaram os teores de MS das silagens. O pH das silagens variou de 3,41 a 3,95, sendo a produ o de ácido lático e a digestibilidade in vitro maior para a silagem de baga o de laranja quando comparada à silagem de milho. Conclui-se que a silagem de baga o de laranja pode ser adequadamente preservada na forma de silagem com aditivos protéicos.
In vitro production of conidia of Alternaria solani
Rodrigues, Tatiana T.M.S;Maffia, Luiz A;Dhingra, Onkar D;Mizubuti, Eduardo S.G;
Tropical Plant Pathology , 2010, DOI: 10.1590/S1982-56762010000400001
Abstract: sporulation of alternaria solani can be scarce and is often reduced when the fungus is cultivated in vitro. a series of experiments were conducted to assess the effects of moisture, mycelial wounding, light quality and photoperiod, and culture media on conidial production. a procedure to induce sporulation based on mycelial wounding and dehydration was adapted and validated. best results were obtained when fungal colonies were grown in v8 medium at 25oc in the dark with agitation for seven days; the mycelium mass was ground, poured into potato dextrose agar (ph 6.5) in plates, and incubated at 25 ± 2oc under near ultraviolet light and 12 h-photoperiod. the procedure was validated with 30 isolates of a. solani from different hosts, sampling locations, ages, and storage conditions. conidial production, germination, and infectivity were quantified. seventy-five percent of the isolates sporulated and the lowest germination rate was 68%. inoculations of conidial suspension of all isolates resulted in lesions on tomato and potato plants. the effect of subculturing on a. solani sporulation was also assessed. after six subcultures, every seven days, there was no reduction in sporulation of colonies that were induced with the protocol.
Survival of Botrytis cinerea as mycelium in rose crop debris and as sclerotia in soil
Araújo, Alderi E;Maffia, Luiz A;Mizubuti, Eduardo S. G;Alfenas, Acelino C;Capdeville, Guy de;Grossi, José A. S;
Fitopatologia Brasileira , 2005, DOI: 10.1590/S0100-41582005000500009
Abstract: botrytis blight caused by botrytis cinerea is an important disease of rose (rosa hybrida) grown in greenhouses in brazil. as little is known regarding the disease epidemiology under greenhouse conditions, pathogen survival in crop debris and as sclerotia was evaluated. polyethylene bags with petals, leaves, or stem sections artificially infected with b. cinerea were mixed with crop debris in rose beds, in a commercial plastic greenhouse. high percentage of plant parts with sporulation was detected until 60 days, then sporulation decreased on petals after 120 days, and sharply decreased on stems or leaves after 90 days. sporulation on petals continued for 360 days, but was not observed on stems after 150 days or leaves after 240 days. although the fungus survived longer on petals, stems and leaves are also important inoculum sources because high amounts of both are deposited on beds during cultivation. survival of sclerotia produced on pda was also quantified. sclerotia germination was greater than 75% in the initial 210 days and 50% until 360 days. sclerotia weight gradually declined but they remained viable for 360 days. sclerotia were produced on the buried petals, mainly after 90 days of burial, but not on leaves or stems. germination of these sclerotia gradually decreased after 120 days, but lasted until 360 days. higher weight loss and lower viability were observed on sclerotia produced on petals than on sclerotia produced in vitro
Avalia??o de produtos alternativos para controle da requeima do tomateiro
Diniz, Lylian P.;Maffia, Luiz A.;Dhingra, Onkar D.;Casali, Vicente W. D.;Santos, Ricardo H. S.;Mizubuti, Eduardo S. G.;
Fitopatologia Brasileira , 2006, DOI: 10.1590/S0100-41582006000200008
Abstract: the efficacy of alternative products to manage tomato (lycopersicon esculentum) late blight, caused by phytophthora infestans, was evaluated in three field trials (e) that compared: e1- [chili pepper (capsicum chinense) + black pepper (piper nigrum) + clove (syzygium aromaticum) + turmeric (curcuma longa) + garlic (allium sativum) extracts]; (black pepper + clove + garlic extracts); and (clove + turmeric + garlic extracts); e2 - neem (azadirachta indica) oil (0.5%), crude cow milk diluted in water (20% v/v), and bordeaux mixture; e3 - homeopathic preparation (from tomato tissue infected with p. infestans - c30), the water-ethanol mixture, and bordeaux mixture. all experiments had two controls: no sprays and metalaxyl. severity at halfway through the epidemic (y50); at the end of the epidemic (ymax); area under disease progress curve (audpc); and disease progress rate (r) were estimated. none of the extracts reduced y50, ymax, audpc, or r values. neem oil and bordeaux mixture resulted in similar y50 values (3% and 1%, respectively). ymax (44%) in plots treated with neem was higher than in those treated with bordeaux mixture (14%). milk at 20% did not reduce ymax. values of r (0.161) and audpc (533) were lower with neem oil than in control (r = 0.211 and audpc = 1186) and similar to the bordeaux mixture plots (r = 0.156 and audpc = 130). values of r and audpc on plots treated with milk were similar to those in the control plots. there was no significant reduction of y50, ymax, audpc, or r values when plants were treated with homeopathic product. bordeaux mixture was the most efficient treatment in controlling late blight. neem oil is potentially useful. integrated management must be implemented to keep late blight at acceptable levels on alternative tomato production systems.
Cinética ruminal da fra??o fibrosa de volumosos para ruminantes
Muniz, Elaine Barbosa;Mizubuti, Ivone Yurika;Pereira, Elzania Sales;Pimentel, Patrícia Guimar?es;Ribeiro, Edson Luiz de Azambuja;Pinto, Andréa Pereira;
Revista Ciência Agron?mica , 2012, DOI: 10.1590/S1806-66902012000300025
Abstract: the objectives of the present work were to characterize and determine the estimates of the parameters relating to the kinetics of ruminal degradation of neutral detergent fiber (ndf) in hays from forest pasture, the jujube plant, mororo, oats and tifton 85, and silages from corn, sorghum and forage cactus. the bromatologic-chemical composition, the degradation coefficients and the effect of ruminal fill of the ndf, were all determined. the bromatologic-chemical characteristics of the feeds under evaluation displayed variations in their nutritional components. the potentially degradable insoluble fraction of the ndf, corresponding to the b2 fraction of the studied feeds, showed variable deterioration. hays from forest pasture, the jujube plant and mororo showed lower values for the potentially degradable fraction. the silages from corn and sorghum showed a small variation in the potentially degradable fraction and in the indigestible fraction, as well as in the degradation rate of the potentially digestible ndf. the highest total retention time was observed for forest pasture, the jujube plant and mororo followed by the silages, with the lowest values for this variable found in the hays from oats and tifton 85. forages, evaluated from semiarid regions (forest pasture, jujube and mororo), may limit dry-matter intake due to lower values of the potentially degradable fraction and higher values of the indigestible fraction. the effect of ndf ruminal fill is determined by the integration of various fiber characteristics. thus the same restrictive inferences on physical intake cannot be made for any and all sources of fiber.
Nutritional characteristics and utilization of sugar cane in ruminants feeding/ Características nutricionais e formas de utiliza o da cana-de-a úcar na alimenta o de ruminantes
Andréa Pereira Pinto,Elzania Sales Pereira,Ivone Yurika Mizubuti
Semina : Ciências Agrárias , 2003,
Abstract: The search for forage alternatives in dry season that are economically viable has taken many livestock farmers to use the sugar cane in the ruminants feeding. This bibliographical review was realized with the objective to discuss the sugar cane nutritional characteristics and its utilization in ruminants feeding. Positive and negative aspects had been told as the production potential, the growing easiness and nutritional limitations. Information had been approached as chemical composition, by-product uses and possible treatments, such as the chemical treatment that increases its digestibility and intake, improving the animals performance. The results of different researches suggest some ways of sugar cane use for the satisfactory results obtaining. However, considering that the sugar cane is poor in proteins and mineral elements, there is necessity of protein supplementation to supply the nutritional requirements. A busca por alternativas de volumosos na época da esta o seca, que sejam economicamente viáveis, tem levado muitos pecuaristas a utilizarem a cana-de-a úcar na alimenta o de ruminantes. Esta revis o bibliográfica foi realizada com o objetivo de discutir as características nutricionais da cana-de-a úcar e suas formas de utiliza o na alimenta o de ruminantes. Foram relatados os aspectos positivos e negativos como o potencial de produ o, facilidade de cultivo e as limita es nutricionais. Abordaram-se informa es como composi o química, utiliza o de subprodutos e possíveis tratamentos, tal como, o tratamento químico que aumenta a sua digestibilidade e consumo, melhorando o desempenho dos animais. Os resultados de diferentes trabalhos de pesquisa sugerem várias formas de utiliza o da cana-de-a úcar para a obten o de resultados satisfatórios. Entretanto, considerando que este é um alimento pobre em proteínas e minerais há necessidade de suplementa o destes componentes para suprir as exigências nutricionais das diferentes categorias animais.
Page 1 /479487
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.