Phlox
Q.

What is wrong with my tall phlox?

Zone 4, northern NH | amybpage added on July 18, 2015 | Answered

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!

A.
A.Answers to this queston: Add Answer
Downtoearthdigs
Certified GKH Gardening Expert
Answered on July 20, 2015

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

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