I have a lot of small(ish) maple trees and majority of the leaves have these white marks on them. Is there anything I can do to get rid of these? They get sunlight for the majority of the day and they get plenty of water from the rain. They have been appearing every year.
Ps. I have no idea about plants so please explain everything as simple as possible😅
by Low_Data_8826
6 Comments
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Powdery mildew.
Sadly it looks like a powdery mildew type fungi. They are many remedies, but one simple one would be :
Use 1 tablespoon of potassium bicarbonate and 1/2 teaspoon of liquid soap in 1 gallon of water. Spray liberally.Â
You can also use neem oil, or commercial fungicide. Good luck!
This is powdery mildew! It doesn’t really cause any harm besides looking unsightly, but I would suggest pruning off the leaves that are most covered so it wont be as prevalent next growing season. Its from the night/day temperature difference, especially if you’re in a humid climate.
https://www.yourleaf.org/blog/andrea-bake/sep-17-2013/ask-arborist-powdery-mildew
Heres all you treatment options!
Baking soda solution: Mix 1 tablespoon baking soda and ½ teaspoon liquid soap such as Castile soap (not detergent) in 1 gallon of water. Spray liberally, getting top and bottom leaf surfaces and any affected areas. This method may work better as a preventative measure, although it does have some effect on existing powdery mildew as well.
Potassium bicarbonate: Mix 1 tablespoon potassium bicarbonate and ½ teaspoon liquid soap (not detergent) in 1 gallon of water. Spray liberally to all affected areas. This mixture may work better than baking soda as a treatment for existing infections.
Milk: Mix 1 part milk to 2 to 3 parts water and spray liberally. While the science behind this solution isn’t fully understood, it seems to work rather well, especially on zucchini, melons and cucumbers. It is believed that naturally-occurring compounds in the milk not only combat the disease, but also boost the plant’s immune system.
Neem oil: By itself, neem oil has mixed reviews on its effectiveness to treat powdery mildew, but it can be added to the above mixtures for an extra boost. (Read more on how to use neem oil.)
Powdery mildew fungicide:Â Use sulfur-containing organic fungicides as both preventive and treatment for existing infections.
Trim or prune:Â Remove the affected leaves, stems, buds, fruit or vegetables from the plant and discard. Some perennials can be cut down to the ground and new growth will emerge. Do not compost any damaged or diseased foliage as the spores can spread and persist in the composted material. Disinfect pruners and all tools after using on infected plants.
Mehltau