Biological properties of a novel paddy herbicide pyrimisulfan.

"Pyrimisulfan" has been developed as new herbicide for paddy fields. Pyrimisulfan shows good efficacy against a wide range of weeds Echinochloa spp., sedges, broadleaf weeds and SU-resistant weeds. This compound also shows good efficacy against perennial weeds, such Bolboschoenus maritimus, Eleocharis kuroguwai and Sagittaria trifolia. However, the efficacy is unstable under flooded conditions, because of a relatively low soil adsorption and high water solubility compare with other rice herbicides. We needed to develop a controlled-release formulation for use as a one-shot herbicide in Japan. "Best Partner TM " has been developed using original formulation technology, to stabilize the herbicidal activity of ‘pyrimisulfan’ under variable environmental conditions. This product is the first one-shot herbicide for rice containing only one active ingredient.