I have a new willow tree and it has new leaves at the end of the branches, but about a foot back on the new growth all the leaves
have turned brown and slowly dropping off. It looks like a bare twig with new leaves at the end. It is planted next to my garden water fall behind he plastic liner about 8 inches. I have another willow at the other end of my pond and it is doing very well with new growth and bright green leaves. We have had more rain in Missouri than we really need for the entire year. I'm going to apply Vigoro tree, shrub and evergreen fertilizer today June 15. total Nitrogen is 16.0%. Please let me know if you have any better ideas to save the tree. Thanks, Steve
Certified GKH Gardening Expert
Yes, you will need a fungicide.
With wet weather comes many fungal infections. This tree is usually tolerant of disease unless it is too young. What can be done is to apply a HANDFUL of DOLOMITIC LIME and a TEASPOON of WETTABLE SULFUR to the soil around the tree. This can be done once or twice per year, if you know the season might be wetter than usual.
You will also want to spray the top with a fungicide. This article will help: https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm