For a highly invasive plant, Japanese knotweed looks unassuming. With green bamboo-like stems, spade- or heart-shaped leaves and, in late summer, clusters of white or pale green flowers, Japanese ...

The herbicide glyphosate, touted as the most effective treatment for controlling knotweed, is one of the most well-studied chemicals, experts say. Scientific data does not support claims that ...

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The USDA affirmed Monday that a leaf-eating insect from Asia can be turned loose on knotweed, an invasive plant that’s cost more than $30 million over the past 15 years to control in Washington. The ...