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Don’t plant too densely, giving space between plants. Aim for an open environment to increase air circulation and reduce humidity Most powdery mildew fungi have a host range restricted to a relatively few, related plants, but these can include wild relatives which can be sources of infection, e.g. wild crab apples may be sources of infection for apple orchards.
The fungicide tebuconazole with trifloxystrobin (Provanto Fungus Fighter Plus, Toprose Fungus Control & Protect) has a recommendation for the control of leaf spots on ornamental plants. Additionally, the fungicides tebuconazole (Provanto Fungus Fighter Concentrate) and triticonazole (Fungus Clear Ultra) are labelled for the control of other diseases on ornamental plants, and could therefore be used legally on Cornus(at the owner’s risk) to try and control anthracnose.Provide good drainage, but water regularly during dry periods (plants suffering from regular but intermittent drought-stress are more susceptible). Application of mulch may help water retention
Spray the whole plant evenly until just before run-off (before drips start to form at the tips of leaves).
Powdery mildew fungi produce microscopic air-borne dispersal spores from the fungal growth on the plant surface. These have an unusually high water content, enabling them to infect under drier conditions than most other fungal pathogens. Then rinse sprayer thoroughly after use and dispose of washings safely by pouring onto bare soil. Once the bottle is empty, RINSE CONTAINER THOROUGHLY before disposal by manually rinsing three times. This can be done by filling the dosing chamber with clean water, replacing the cap and tipping the water into the bottle. Repeat steps 1 – 4 above to add washings to sprayer at time of filling and dispose of empty container safely.
Always settle for a fungicide that matches your specific needs. And when applying, follow the instructed procedure and follow all the laid out precautions. Obviously, don’t go spraying fungicides near streams or ponds, unless it’s labelled for such use. Only store chemicals in their original container and retain instructions in case of medical emergency.
How to Prune Roses and When
Remove plantsat any time, but beware of the risks of transporting the pathogen around the garden in wet conditions Edibles:Tebuconazole with trifloxystrobin (ProvantoFungus Fighter Plus) can be used on glasshouse crops of cucumber, courgette and summer squash. Sulphur (Mildew Clear for Edibles) can be used on grapevines, gooseberries, cucumbers, peas and a wide range of root and tuber vegetables (full details on label). Because most of the growth of powdery mildews is found on the plant surface they are easily targeted with fungicides. The RHS believes that avoiding pests, diseases and weeds by good practice in cultivation methods, cultivar selection, garden hygiene and encouraging or introducing natural enemies, should be the first line of control. If chemical controls are used, they should be used only in a minimal and highly targeted manner. Non-chemical control
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