As plantas invasoras representamPALA VR AS CH AVE S: Vá rz ea, Pla nt a Inv asora, Levantamento, Biologia.PLANTA DANINHA III (2), [85][86][87][88][89][90][91][92][93][94][95] 1980 PLANTAS INVASORAS DE VÁRZEA NO ESTADO DE SÃO PAULO RESUMOAs plantas invasoras que ocorrem em uma determinada cultu ra, constituem sério pro ble ma, tendo em vista a concorrência em água, luz e nutrientes que promove com a planta cultivada, determinando uma sensível que da da produtivida de da la vo ur a. O le va ntam en to e re co nhecimento dessas plantas, além do estudo biológico, permitem um controle mais efi ciente e económi-co.A cole ta do ma terial bo tâ nico foi realiz ada através de visitas em áreas de várzeas cultivadas e em trê s épocas distinta s do ano , com a finalidade de se levantar o maior número possível de espécies invasoras. A fenologia, o modo ou modos de reprodução, frequência e ciclo são elementos indispensáveis para um controle racional e efetivo.Apesar do maior número de espécies pertencerem as famílias Compositae e Gramineae, as espécies de maior importância econômica estão abrigadas também nas famílias Cyperaceae, Lythraceae, Onagraceae, Polygonaceae, Pontederiaceae e Portulacaceae. SUMMARYDue to competition for water, light and nutrients the weeds are serious problems for certain kind of crops. They are responsible for the reduction in production. The survey and the recognition of different weeds and the their biological study permit a more efficient and economical way of control.The botanical material was collected in lowland crops during three different periods of the year. The purpose was to collect as many different species of weeds as possible. The phenology, the mode of reproduction, the frequency and cycle of weed species are important factors for the rational and effective control.Although the greatest amount of weed species collected belong to the Compositae and Gramineae, the most economically important species belong to the following families: Cyperaceae, Lythraceae, Onagraceae, Polygonaceae, Pontederiaceae and Portulacaceae.
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