Use este identificador para citar ou linkar para este item: http://www.alice.cnptia.embrapa.br/alice/handle/doc/458373
Título: Control of milk weed (Euphorbia heterophylla) with Helminthosporium sp.
Autoria: YORINORI, J. T.
GAZZIERO, D. L. P.
Afiliação: EMBRAPA-CNPSo. Londrina, PR.; DIONISIO LUIZ PISA GAZZIERO, CNPSO.
Ano de publicação: 1989
Referência: In: INTERNATIONAL SYMPOSIUM BIOLOGICAL CONTROL OF WEEDS, 7., 1988. Rome. Proceedings... Rome: Institute Sperimentale per la Patologia Vegetale/MAF, 1989. p. 571-576.
Conteúdo: In the 1980/81 crop season the National Soybean Research Center of EMBRAPA, Brazil, initiated a biological control program for milk weed, Euphorbia heterophylla. It is estimated that ca. 200.000 ha of cropland, mainly soybeans, is infested, demanding an expenditure of ca. US$ 3.7 million worth in chemicals for 1987/88 season. A naturally-occurring Helminthosporium species was found to be virulent on most populations of the weed. The majority of the populations are uniformly susceptible, some are uniformly immune and others are mixed-susceptible, immune and plants with varying degrees of infection. Germination of spores in mixtures with herbicides bentazon, sethoxydin and surfactant was unaffected, but was severely affected by fomesafen and the surfactant energic at the recommended rates. Germination was not affected when in mixtures with Bacillus thuringiensis, Baculovirus anticarsia and carbaryl. Dried spores kept for 14 monts in sealed test tubes were slow to germinate in water but reached 83% after 24 h. When spores were dry-formulated in lactose and stored for six months under laboratory conditions, germination reached 93% after 4 h incubation, and 99% after 24 h. Time of field application (8:00, 12:00 and 16:00), with temperatures varying from 23.8, 27,7 and 32.3oC, respectively, did not interfere with degree of infection, indicating that the fungus can be applied at any time of the day. Field application was adversely affected by low relative humidity but timely application under adequate conditions ...
Thesagro: Controle Biológico
Euphorbia Heterophylla
NAL Thesaurus: Brazil
biological control
Palavras-chave: Planta daninha
Helminthosporium sp
Brasil
Parana
Weed
Tipo do material: Artigo em anais e proceedings
Acesso: openAccess
Aparece nas coleções:Artigo em anais de congresso (CNPSO)

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