Help! Powdery mildew?


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Help! Newer to gardening and certainly new to owning citrus trees! I bought a Meyers lemon and lime tree recently from a local nursery and about three days later noticed what appears to be mildew on a couple of the leaves. I want to say powdery mildew, any ideas what this could be?
 

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It looks like powdery mildew. I would spray it with either 3% hydrogen peroxide or baking soda solution
 
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Tarpley Tx
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Hi Chuck, how do you make up the Baking Soda spray please
When I need to use something for mildew I use about 2 heaping tablespoons of the soda per gallon of water. I wait about 7 days to see if anything has changed. If it hasn't I will spray with Neem. This usually takes care of the problem.
 
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