Rumex confertus Willd., a dangerous weed, characterized by its high reproduction potential, occurs in new stands in Poland every year. Its chemical control is difficult due to the rich root system. This study offers an analysis of insects which occur on Rumex confertus Willd., as well as the contents of secondary metabolites. It was noticed that mossy sorrel is occupied by numerous herbivorous insects; generative organs were mostly damaged. The higher the damage index, the greater the content of polyphenolic acids in the plant.

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