Wine Industry Newsletter

New restrictions on the number of Group M3 and Group M5 fungicide sprays

Vineyard sprayer in operation
Changes to the recommendations for Group M3 and Group M5 fungicides will appear in the AWRI 2020/2021 ‘Dog book’. 

The recommended number of sprays of Group M3 fungicides is now limited to no more than three sprays per season. 

The Group M3 fungicides are known collectively as dithiocarbamates. The dithiocarbamate active constituents registered for use in wine-grape production are mancozeb, metiram, propineb, thiram, zineb and ziram. The fungal targets for these active constituents include black spot, downy mildew and phomopsis cane and leaf spot.  

Note that the limit of three sprays per season includes when Group M3 fungicides are co-formulated with other active constituents such as metalaxyl (-M).  

A change has also been made to the restriction on use for mancozeb which is ‘Use no later than E-L 31, berries pea-size (not > 7 mm diameter)’.    

The number of sprays of Group M5 fungicides is also now limited to no more than three sprays per season. Chlorothalonil is the only Group M5 fungicide. The fungal targets for chlorothalonil are black spot, botrytis bunch rot and downy mildew. 

This information has been provided by the AWRI, contact the AWRI helpdesk on 08 8313 6600 or for further assistance.