Revista Brasileira de Plantas Medicinais
URI permanente para esta coleçãohttps://thoth.dti.ufv.br/handle/123456789/13760
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Item Antifungal activity using medicinal plant extracts against pathogens of coffee tree(Sociedade Brasileira de Plantas Medicinais, 2011-09-11) Silva, J. L.; Souza, P. E.; Monteiro, F. P.; Freitas, M. L. O.; Silva Júnior, M. B.; Belan, L. L.Generally, the medicinal plants have antifungal substances that can be used for the plant protection against phytopathogens. The objective of this study was to know the efficiency of aqueous extracts from medicinal plants against the major etiological agents of coffee tree. The aqueous extracts used were extracted from bulbs of Allium sativum, leaves of Vernonia polysphaera, Cymbopogon citratus, Cymbopogon nardus, Cordia verbenacea, Eucalyptus citriodora, Ricinus communis, Azadirachta indica, Piper hispidinervum and flower buds of Syzygium aromaticum. The etiological agents considered for this study were Cercospora coffeicola, Colletotrichum gloeosporioides, Fusarium oxysporum, Phoma tarda, Rhizoctonia solani and Hemileia vastatrix. The screening for harmful extracts was done based on mycelial growth and conidial germination inhibition. All experiments performed were in vitro conditions. The inhibition of mycelial growth was performed mixing the extracts with the PDA. This mixture was poured in Petri dishes. On the center of the dishes was added one PDA disc with mycelium. It was incubated in a chamber set to 25ºC. The evaluation was done daily by measuring the mycelial growth. The germination assessment was also performed with Petri dishes containing agar-water medium at 2%. These were incubated at 25ºC for 24 hours. After this period the interruption of germination was performed using lactoglycerol. The experiments were conducted in a completely randomized design. The most effective plant extracts against the micelial growth and conidial germination were V. polysphaera, S. aromaticum and A. sativum.Item Composição química e atividade inseticida do óleo essencial de Schinus terebinthifolius Raddi (Anacardiaceae) sobre a broca-do-café (Hypothenemus hampei) Ferrari(Sociedade Brasileira de Plantas Medicinais, 2013-10-17) Santos, M. R. A.; Lima, R. A.; Silva, A. G; Lima, D. K. S.; Sallet, L. A. P.; Teixeira, C. A. D.; Facundo, V. A.O óleo essencial das folhas de Schinus terebinthifolius foi obtido por hidrodestilação e analisado por CG-EM. O rendimento do óleo foi de 0,8%, sendo identificados 37 constituintes químicos. Os componentes principais foram germacreno D (25,0%), (E)-β-cariofileno (17,5%) e δ -elemeno (10,5%). O óleo essencial foi diluído em acetona nas concentrações de 10-2 a 10-8 e aplicado aos insetos (Hypothenemus hampei) por aplicação tópica e exposição em superfície contaminada. As taxas de mortalidade foram avaliadas após 24 e 48 horas do início do experimento. A aplicação em superfície contaminada resultou em 25% de mortalidade no controle, enquanto nas diluições de 10-2 a 10-8 foram observados 100,0 a 30,0% de mortalidade. Na aplicação tópica, observou-se 27,5% de mortalidade no controle e 97,5 a 77,5% nas diluições de 10-2 a 10-8.Item Selection of active plant extracts against the coffee leaf miner Leucoptera coffeella (Lepidoptera: Lyonetiidae)(Sociedade Brasileira de Plantas Medicinais, 2013-08-23) Alves, D. S.; Oliveira, D. F.; Carvalho, G. A.; Carvalho, D. A.; Souza, L. P.; Lasmar, O.Aiming to contribute to the development of alternative control methods of the coffee leaf miner, Leucoptera coffeella (Guérin-Mèneville & Perrottet, 1842) (Lepidoptera: Lyonetiidae), a search for plants able to produce active substances against this insect was carried out, with species collected during different periods of time in the Alto Rio Grande region, (Lavras, Minas Gerais, Brazil). Coffee leaves containing L. coffeella mines were joined with 106 extracts from 77 plant species and, after 48 hours, the dead and alive caterpillars were counted. The extracts from Achillea millefolium, Citrus limon, Glechoma hederacea, Malva sylvestris, Mangifera indica, Mentha spicata, Mirabilis jalapa, Musa sapientum, Ocimum basiculum, Petiveria alliaceae, Porophyllum ruderale, Psidium guajava, Rosmarinus officinalis, Roupala montana, Sambucus nigra and Tropaeolum majus showed the highest mortality rates.