Tripa de sapo
Alternanthera philoxeroides
Planta invasora medianamente frequente, infestando principalmente lavouras de arroz irrigado, canais de dernagem, lagoas e represas. É bastante prejudicial em lavouras de arroz, chegando a dominar a cultura. Em lagos e represas, cresce inicialmente enraizada no fundo, entretanto, com o bater das ondas desprende-se e passa a flutuar, formando pequenas ilhas que continuam a crescer. Nos Estados Unidos, onde foi introduzida, apresenta níveis de desenvolvimento e infestação muito mais intensos que no Brasil, que é seu habitat natural. Isto tem motivado um intenso trabalho de pesquisa em controle biológico desta planta invasora.
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