Switch Fungicide was granted registration by the National Registration Authority in late 2000 for the control of grey mould (Botrytis cinerea) in grapevines.
Switch is a Syngenta product, and contains two active constituents, cyprodinil and fludioxonil. Cyprodinil is a Group I (anilinopyrimidine) fungicide and fludioxonil is a Group L (phenylpyrrole) fungicide.
Previously, it was recommended that Switch should not be used after 80% capfall if the grapes were destined for wine to be sold overseas. This allowed for one to two sprays up to 80% capfall, as indicated on the label.
This restriction has now been ammended so that:
For export grapes, Switch can be applied as a single application prior to the commencement of bunch closure (E-L 31), but should not be applied within 60 days of harvest.
Switch should not be applied at both flowering and growth stage E-L 31.
Note: E-L 31 is the grapevine growth stage when berries are pea-sized (7mm diameter). Refer to Coombe, B. (1995) Grapevine growth stages – The modified E-L system. Australian Journal of Grape and Wine Research (1) pp 100-110.
This information is provided to inform the wine industry of agrochemical product information, and should not be interpreted as an endorsement.