Avoid overhead watering: water your plants from the base instead of overhead to reduce the leaves’ exposure to water because rust needs water to germinate.Even then, experts recommend quarantining new plants for at least 3 weeks in a separate area of your home to make sure they’re not infected. Buy disease-free plants: before bringing home any seedlings or plants, first check them for signs of rust disease.Remove infected leaves: prune off diseased leaves and collect fallen foliage immediately, then either put them in a bag for disposal or burn them to destroy the spores.Disinfect garden tools: make sure to sterilise your pruning tools and any other gear that comes into contact with infected plants to avoid spreading the infection.Prune and space plants: increasing air circulation by thinning foliage and spacing your plants helps to treat powdery mildew. Alternating between a baking soda spray and a milk spray helps to prevent the fungus from becoming resistant to the treatments. A mixture of 1 part milk to 10 parts water sprayed once every 7 to 14 days can significantly help to prevent infection before it appears. Spray with milk: believe it or not, full cream milk is actually effective against powdery mildew.Spray an even coat of the mixture once a week to every surface of the plant including the stem and the undersides of the leaves. Mix 1 tablespoon of baking soda with 1/2 a teaspoon of liquid, non-detergent soap, and 1 gallon of water. Use baking soda and non-detergent soap mixture: although it’s more effective when used as a preventative measure, this mixture also helps to control powdery mildew once it has already developed.Remove infected leaves: to curb the spread of the fungus, prune off all leaves that have signs of powdery mildew on them and collect any fallen leaves because they could be further sources of infection.However, do not keep the leaves wet for too long as this may cause other diseases to develop. Water the leaves:spraying the affected areas with plain water once a week can eradicate the spores because they can’t tolerate a wet environment.
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