Hi, I have six new sunflower plants growing in my yard and have noticed tiny...

Asked August 18, 2015, 6:32 PM EDT

Hi, I have six new sunflower plants growing in my yard and have noticed tiny black specks on the under and top side of their leaves. The leaves turn yellow and die eventually ( killed my cucumber). I cannot tell if it is aphids or a type of powdery mildew. I don't want to start my garden from scratch and any help would be greatly appreciated. Pictures available upon request.

Lee County Florida

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