What is wrong with my tall phlox?

My tall phlox has done well for years. However, this year the leaves are light in color and are curling up. I believe I might have an insect infestation and have seen little black beetles on the leaves. I am going to spray with neem oil but I want to make sure this is the problem. Thanks!

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1 Comment To "What is wrong with my tall phlox?"

#1 Comment By Downtoearthdigs On 07/20/2015 @ 1:21 pm

Yes, treat the insects with Neem OIl. This is a good choice as it acts as both an insecticide and fungicide.

The yellowing leaf patter can indicate an iron deficiency in the soil.
Here is a link with more information.

https://www.gardeningknowhow.com/plant-problems/environmental/leaf-chlorosis-and-iron.htm ^[1]

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