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Valent debuts ProTone in US

Sumitomo Chemical’s US subsidiary, Valent USA Corporation (Walnut Creek, California), is to start marketing the plant growth regulator, ProTone (S-abscisic acid 20%), for use on grapevines following its approval by the federal EPA and the California EPA. The product is aimed at improving fruit colour and quality. The federal EPA proposed the registration in January ( Agrow No 585, p 22). Valent’s sister company, Valent BioSciences (Libertyville, Illinois), is developing a line of products based on S-abscisic acid for use on a range of agricultural and horticultural crops.


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