Grape leaf problems
Local homeowner brought 2 samples of grapevine leaves. The first is yellow with green veins, chlorosis. I suspect Nitrogen deficienty, she thinks iron. She has been applying copper-ease, iron & sulfur. The leaves are staying the same, not worsening. Has never taken a soil test herself. When Conservation District tested years ago, the soil was different all over the vineyard (she has 18 vines.) I did recommend she do it again in the problem areas as this is only affecting some of the vines. The other leaf sample has brownish/orange spots. She has applied copper fungicide right before blooming and once a week since. She's also using Neem Oil. I'm not familiar with those products. She is beginning to notice tiny black spots on the grapes. I suspect Black Rot but due to the difficulty and possible severity of this, would like someone else to also take a look. Photos are attached. Thank you.
Codington County South Dakota