Our navel oranges are turning orange early this year and falling. Cutting them open to find at the navel end rotten. One had a white worm. What if anything can we do to remedy this.
This is citrus brown rot. There isn't a lot you can do, as most treatment is preventative. In some cases wettable sulfur, or iron sulphate can help, or copper sulfate as well. This article will give you more information: https://www.gardeningknowhow.com/edible/fruits/citrus/citrus-fruit-brown-rot.htm