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first report of dolichozele koebelei viereck, 1911 (hymenoptera: braconidae) on larvae of spodoptera frugiperda (j. e. smith, 1797) (lepidoptera: noctuidae) in maize (zea mays l.) under different cropping systems.in the context of the modern agriculture, pest control is important in order to increase productivity in maize (zea mays l.). however, this control should be done rationally, prioritising environmentally safer methods such as biological control. this paper aims to report the occurrence of dolichozele koebelei viereck, 1911 (hymenoptera: braconidae) in spodoptera frugiperda (j. e. smith, 1797) (lepidoptera: noctuidae) larvae collected in maize subjected to different cropping systems. the experime ...201425627388
natural occurrence of aflatoxins and zearalenone in maize in brazil. part ii.the levels of aflatoxins and zearalenone were determined in 328 samples of corn from the states of santa catarina, minas gerais, são paulo, paraná, rio grande do sul and espírito santo by thin-layer chromatography; the samples were obtained from april 1985 through to march 1986. in 12.3% of these samples aflatoxin b1 was detected in concentrations that varied from 10 to 900 micrograms/kg (ppb); 18 samples showed levels above those tolerated by brazilian legislation. zearalenone was found in 4.5% ...19892524411
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