Canada to ok Winfield Phosphite fungicides

The Canadian Pest Management Regulatory Agency (PMRA) is granting full registration for the sale and use of Winfield Phosphite TGAI, Winfield Phosphite Colorless, Winfield Phosphite Extra, Winfield Phosphite Turf, and Confine Post, containing the active ingredient mono- and di-potassium salts of phosphorous acid, for the control of certain diseases on potatoes; fruiting vegetables; basil;brassica leafy vegetables; leafy vegetables; cucurbits; grapes; ginseng; strawberries; outdoor ornamentals; conifers and trees; and turf grasses.

Mono- and di-potassium salts of phosphorous acid are fungicide active ingredients belonging to Group 33 as designated by the Fungicide Resistance Action Committee and are classified as phosphonates. The mode of action of phosphorous acid is both direct and indirect, and involves the induction of host plant resistance and the inhibition of oxidative phosphorylation. Mono- and di-potassium salts of phosphorous acid are the active ingredients contained in Winfield PhosphiteTGAI, Winfield Phosphite Colorless, Winfield Phosphite Extra, Winfield Phosphite Turf andConfine Post.

Winfield Phosphite TGAI is based on the precedent technical grade active ingredient, mono- and di-potassium salts of phosphorous acid (Registration Number 29099). Confine Post is based on the precedent product Confine (Registration Number 29100) which is registered for suppression of late blight and pink rot on harvested potato tubers. The major new uses for Winfield Phosphite Colorless and Winfield Phosphite Extra are on potatoes; fruiting vegetables; basil; brassica leafy vegetables; leafy vegetables; cucurbits; grapes; ginseng; strawberries; outdoor ornamentals;conifers and trees and for Winfield Phosphite Turf use on grass turfs.

The public comments will be closed until Sep 8, 2013.