What Is Causing New Growth on Wisteria to Curl and Drop Off?

Question

I have a 7 year old Wisteria grown from a seed. It bloomed slightly last year and profusely this year. Something was skeletonizing the leaves, and I found tiny worms under the leaves, pale whitish green. I sprayed the plant with an insecticide with Sevin in it. I don’t see any more worms, but now the new leaves are unusually yellow, and they curl up, get slightly brown at the tips, and drop off. What can this be? I have a huge amount of those tiny brownish red ants all through my garden, but it never seemed to affect the plant before. Aany ideas would be appreciated!

Answer 1

Is there any possibility of your sprayer being used with a herbicide before using the insecticide? What you describe sounds like herbicide damage.
I don’t think the ants would be damaging your wisteria.

Answer 2

No, it never had anything else in it. I believe the insects I have are some kind of leaf roller. I gave the plant some miracle grower, and will try a different insecticide. Thanks!

Answer 3

It may also be thrips. They can attack new growth and flowers and are very hard to see.

This article has more information:
https://www.gardeningknowhow.com/plant-problems/pests/insects/controlling-thrips.htm