March 22, 2012 - Syngenta Canada Inc. has received Emergency Use Registration for Switch® fungicide, for suppression of boxwood blight on outdoor boxwood in British Columbia, Ontario and Quebec until December 31, 2012.
Boxwood blight, caused by a Cylindrocladium fungus, has been rampant in the European Union for a number of years and has now moved to North America. It was first detected in two states in the U.S. in October 2011. In January 2012, the disease turned up in five states in the U.S., as well as in British Columbia. The blight starts with spots on leaves and black streaks on twigs. Within a few weeks, a plump shrub can turn into a clump of bare sticks.
“The Emergency Use Registration of Switch fungicide is welcome news to the horticultural industry as there is currently nothing registered for control of this disease,” stated Eric Phillips, Asset Lead, Fungicides and Insecticides for Syngenta Canada. “Boxwood blight is an aggressive fungal disease which can completely destroy the shrubs if they are attacked.”
Switch 62.5WG fungicide has two modes of action, cyprodinil (Group 9) and fludioxonil (Group 12), which work together to suppress the disease and provide the best protection available. Cyprodinil is the systemic component of the fungicide and because of its lipophilic properties, it is easily taken up into the waxy layers and cuticle of leaves where it continuously distributes and penetrates into adjoining plant parts. Fludioxonil is the contact component of Switch, staying mainly on the leaf surfaces to act as a barrier to pathogens attempting to infect the leaf tissue.
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