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| Registros recuperados: 243 | |
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| Mantecón,Jorge D. |
| Late blight (Phytophthora infestans) is the most destructive fungal disease of potato (Solanum tuberosum) in Argentina, reducing yields considerably. During the 1986-2005 growing seasons, fungicide treatments to control potato late blight were performed using mancozeb (Dithane M80 WP, Dow AgroScience Argentina, 1986-2005) every 7 d, metalaxil+mancozeb (Ridomil MZ 72 WP, Syngenta Agro Argentina, 1986-1995) every 14 d, and mefenoxam+mancozeb (Ridomil Gold 68 WP, 1996-2005) every 7 d. Blight severity was rated five times each season on the basis of the percentage of diseased foliage caused by late blight. Five visual assessments of infection were used to calcúlate the area under the disease-progress curve (AUDPC, foliar blight x day). Marketable (>60 g)... |
| Tipo: Journal article |
Palavras-chave: Chemical control; Late blight; Phytophthora infestans; Potato; Potato diseases; Solanum; Yield increases. |
| Ano: 2009 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202009000100011 |
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| Yamashita, O. M.; Kobayashi, L.; Cassetari Neto, D.; Santi, A.; Peres, W. M.; Carvalho, M. A. C.; Kappes, C.. |
| Leaf spot is a disease provoked by the fungus Bipolaris maydis, that it causes great damages for annual crops, as the corn, the wheat and the oats. Tests "in vitro" were accomplished seeking to evaluate the efficiency in the inhibition of the mycelial growth of that patogenic fungus through five fungicides: tetraconazol, tebuconazole, azoxystrobin + cyproconazole, trifloxystrobin + ropiconazole and trifloxystrobin + cyproconazole were ested fungicides. For the determination of the efficiency f the products, the daily growth of the fungus was valuated, being compared with the control. It was determined the percentage of growth inhibition. All of the treatments were effective in the inhibition of the growthof this fungus. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fungus; Inhibition; Disease; Chemical control. |
| Ano: 2010 |
URL: http://e-revista.unioeste.br/index.php/scientiaagraria/article/view/4270 |
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| Madaleno,Leonardo L.; Ravaneli,Gisele C.; Presotti,Leandro E.; Mutton,Miguel A.; Fernandes,Odair A.; Mutton,Márcia J.R.. |
| Mahanarva fimbriolata (Stål) is an important pest in Latin America and causes significant reduction in sugarcane productivity. There is no information regarding the effect of this pest on the quality of cane juice used for sugar and alcohol production. This work aimed at evaluating the quality of sugarcane juice from plants attacked by spittlebugs. The experiment was arranged in a completely randomized design with 15 replications, and comprised two treatments: control and chemical treatment with thiamethoxam. An average of 9.2 ± 4.44 spittlebug nymphs m-1 were found in the plots prior to insecticide application. Nymphs were counted 18, 35, 55, and 82 days after the initial sampling (december/2003). During the mid growing season (July 2004), the juice was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Spittlebug; Insect-day; Chemical control. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2008000100010 |
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| Santos,VC; Siqueira,HAA de; Silva,JE da; Farias,MJDC de. |
| The diamondback moth Plutella xylostella (L.) has a great economic importance in Brassicaceae crops in many parts of the world. Recurrent infestations of this pest in growing areas of Pernambuco state, Brazil, have led farmers to frequently spray their crops with insecticides. However, control failures by several insecticides have been alleged by farmers. The objective of this study was to check whether resistance to insecticides could explain these control failures in P. xylostella. Populations of P. xylostella from Pernambuco were collected between January and April 2009. The resistance ratios of P. xylostella populations were compared among five different active ingredients: abamectin, methomyl, lufenuron, indoxacarb, and diafenthiuron by leaf dipping... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Insect; Chemical control; Survey; Leaf-dipping bioassay; Lethal ratio. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2011000200017 |
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| Boiça Júnior,Arlindo Leal; Macedo,Marcos Aurélio Anequini; Torres,Adalci Leite; Angelini,Marina Robles. |
| The usage of insecticidal plants and others insect resistant varieties can be strong allies to the Integrated Pest Management (IPM), being able to reduce the number of insecticides applications and to minimize its effect to the man and the environment.The following control techniques were compared in field conditions, investigating the late pest control of two determinate tomato cultivars: a) Conventional - sprayings of metamidophos, buprofezin, acephate, cipermetrin, abamectin, permetrin, teflubenzuron and lufenuron, applied every three to six days; b) IPM - action threshold of each pest to the spraying of imidacloprid, triflumuron, lufenuron and abamectin; c) IPM - Azadirachta indica (neem) - Action threshold of each pest to the spraying of the nim oil... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Azadirachta indica; Lycopersicon esculentum; Chemical control; Integrated pest management. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000600005 |
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| Rondelaud, D. |
| The treated habitats have not been recolonized by Lymnaea truncatula . Four aquatic snail species showed an increase in their numbers: L. glabra in the stations of Haute-Vienne, L. glabra, Physa acuta, P. hypnorum and Planorbis rotundatus in the habitats of Indre. The numbers of L. glabra and P. acuta reached their maximum on the third year and decreased thereafter; those of P. hypnorum and P. rotundatus slightly increased from the fourth or the fifth years treatment. The colonization of L. truncatula habitats was incomplete and did not reach over 50% of the surface for L. glabra and P. acuta , 20% for P. hypnorum and P. rotundatus . The bivalve Pisidium casertanum did not recolonize treated habitats. There were no modifications in the numbers of... |
| Tipo: Text |
Palavras-chave: Physa; Lymnaea; Mollusca; Biological control; Chemical control; Population density; Population dynamics; Freshwater molluscs. |
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/1991/acte-1715.pdf |
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| Vargas,L.; Ulguim,A.R.; Agostinetto,D.; Magro,T.D.; Thürmer,L.. |
| In the last growing seasons, goosegrass (Eleusine spp.) control failures have been observed following application of glyphosate on Roundup Ready® soybean in Rio Grande do Sul (RS) - Brazil, suggesting this species' resistance to the herbicide. Thus, the objectives of this study were to identify the occurrence of goosegrass resistance to the herbicide glyphosate in RS; and to determine the predominant species of the genus Eleusine, as well as the LD50 and GR50 of the suspected resistant biotypes. Two experiments were conducted under greenhouse conditions: one to identify the biotypes resistant to glyphosate, and the other, a dose-response curve experiment, as well as a study of the botanical characteristics of the species. In the first experiment, 39... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max; Chemical control; Dose-response curve. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582013000300019 |
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| SANTOS JUNIOR,A.; FREITAS,F.C.L.; SANTOS,I.T.; SILVA,D.C.; PAIXÃO,G.P.; SEDIYAMA,C.S.. |
| ABSTRACT: The repetitive use of glyphosate in the control of weeds in eucalyptus plantations has selected tolerant species such as Commelina benghalensis. Therefore, the use of herbicides of other mechanisms of action, such as saflufenacil, in rotation or combination with glyphosate, is necessary to reduce damages caused by C. benghalensis, whose sensitivity to herbicides can be influenced by the shading caused by the eucalyptus crop. This study aimed to assess the efficiency of saflufenacil in the management of C. benghalensis at different shading levels. Three experiments were carried out regarding a certain shading level (cultivation environment with 0, 40, and 55% shade). The experimental design was a randomized block design with five herbicide doses... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Shading; Chemical control; Biomass allocation; Weed; Benghal dayflower. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100249 |
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| FONTES, J. R. A.; SHIRATSUCHI, L. S.; NEVES, J. L.; JÚLIO, L. de; SODRÉ FILHO, J.. |
| ABSTRACT: Integrated weed management (IWM) is essential to sustainable agricultural production by reducing costs and nega tive environmental impact. Weeds are not necessarily undesirable and, in certain situations, they are more beneficial than harmful, contributing to integration of control methods. It has been demonstrated that crops coexist with weeds in certain growth phases of both without yield damage. This change of traditional approach, however, is not always easy to implement due to the concept that weeds need to be eliminated of the agricultural environment at any cost. A form to promote change in attitude is to deliver detailed, simple and objective information to farmers. Researchers have accumulated information be delivered by various means.... |
| Tipo: Documentos (INFOTECA-E) |
Palavras-chave: Planta daninha; Growth; Reroduction.; Controle Biológico; Controle Químico; Crescimento; Reprodução.; Chemical control; Biological control; Weeds.. |
| Ano: 2003 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/567569 |
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| Registros recuperados: 243 | |
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