Interestingly, an effective means of preventing and treating powdery mildew is to spray the foliage of your plants daily with water from the hose. Treat the powdery mildew now, and then weekly until the fungus is gone. You put manure on it and then cover with a clear plastic. Others say to deal with it asap to stop it spreading. Organic control of powdery mildew Plant courgette plants in a position of full sun and allow plenty of space between plants to help ensure good ventilation. I have a courgette plant with powdery mildew (at least that's what I think it is checking against photos online). I have also heard that using compost in the soil can kill the powdery mildew. Agree with Momofstig. Remove any plant debris from an infected plant from the area and dispose of. but you need to put it on the soil real hot. This both treats existing powdery mildew and protects the plant against further infection. If you do see powdery milldew on courgettes a spray containing just sulphur will stop it spreading. I'm just a little bit unsure of the best course of action. The affected plant is quite well developed with the first flowers just starting to appear, but I only have 5 growing so it's loss would be felt. Also, I grow Defender F1, which has been bred for resistance to powdery mildew. Some say if it isn't too bad and the plant is still doing well it can be left alone. It is a pattern seen on some varieties of courgette. Its 6- to 8 … Question: Can I treat the soil before I replace the current plant with a new shrub? Answer: You can, but the mildew spores do not reside in the soil. and not use that spot in the garden for a year. I agree, not powdery mildew, just natural patterning. When you consider that each plant will cover at least 1 square metre then leave at least a metre between plants. It looks like I have powdery mildew on one of my courgettes already.... :- I did have a problem right at the end of the season last year but just pulled the plants up. Apply a milk spray to your plants as a preventative measure. Popular cultivars include: ‘Marketmore 76,’ a home garden staple. I never bother treating it when it inevitably arrives anyway - I'm sick of the sight of courgettes by then. Powdery Mildew Prevention. I think this is acceptable to organic growers. I just cut off any really sick, crispy leaves. And the sun will heat it up and the heat helps sanitize the soil. The best strategy is to plant vines known to be mildew resistant. The manure has good bacteria that will kill the bad bacteria. When it comes to cukes and powdery mildew, prevention is worth a thousand cures.
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