摘要：

Phytosociological surveys are very important when identifying an invasive community in order to carry out more suitable weed management. The aim of this study therefore, was to identify the main species of weeds in banana plantations, both newly-planted and under production, in the northern region of the State of Minas Gerais, Brazil. For the phytosociological study and characterisation of the weed community, two areas of Prata bananas, both ofhectares, were evaluated using the method of inventory squares, which were randomly thrown along a zigzag path. The following phytosociological variables were evaluated frequency, relative frequency, density, relative density, abundance, relative abundance, importance value index, relativeimportance value index and similarity index. In the newly-planted area,species were found, divided intogenera and ten families, with the Fabaceae and Poaceae families being prominent. The species with the highest importance indices were Sida spp. (.), Galinsoga parviflora (.), Amaranthus hybridus (.) and Ipomoea hederifolia (.). In the area under production,species,genera and ten families were found, with the Asteraceae family being prominent. The species with the highest relative-importance value indices were Commelina benghalensis (.), Emilia fosbergii (.) and Amaranthus hybridus (.). Between the two areas, there was a difference in the mean values for density, and for the number of plants with C metabolism five in the newly-planted area, and three in the area under production. The Similarity Index between the two areas was .%, with seven species common to both areas.O levantamento fitossociolgicomuito importante para conhecer a comunidade infestante e, com isso, realizar de forma mais adequada o manejo das plantas daninhas. Objetiva-se com este trabalho identificar as principais espcies de plantas daninhas em reas de bananicultura recm-implantadas e em produo na regio do norte de Minas Gerais. Para caracterizao e estudo fitossociolgico da comunidade infestante, avaliaram-se duas reas de banana-prata, ambas comhectares, nas quais se utilizou o mtodo do quadrado inventrio, lanado aleatoriamente por meio de um caminhamento em ziguezague. Avaliaram-se as seguintes variveis fitossociolgicas frequncia, frequncia relativa, densidade, densidade relativa, abundncia, abundncia relativa, ndice de valor de importncia, ndice de valor de importncia relativa e ndice de similaridade. Na rea recm-implantada foram encontradasespcies, divididas emgneros e dez famlias, destacando-se, dentre essas, as famlias Fabaceae e Poaceae. As espcies com maiores ndices de importncia foram Sida spp. (,), Galinsoga parviflora (,), Amaranthus hybridus (,) e Ipomoea hederifolia (,). No bananal em produo, encontraram-seespcies,gneros e dez famlias, com destaque para a famlia Asteraceae. As espcies que apresentaram maiores ndices de valor de importncia relativa foram Commelina benghalensis (,), Emilia fosbergii (,) e Amaranthus hybridus (,). Entre as duas reas houve diferena nas mdias de densidade e nos nmeros de plantas com metabolismo C na rea recm-implantada foram cinco e na rea em produo foram trs. O ndice de Similaridade entre as duas reas foi de ,%, sendo sete espcies comuns s duas reas.

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