My Ruby Red Grapefruit tree is about 5 years old. Up until 2 weeks ago, the fruit was green and the leaves were healthy. Then the fruit turned yellow, and got sort of mushy looking, and the leaves started to fall off. I live in South Florida, (Venice). What could possibly be wrong here? I am attaching photo.
We spend 7 months there in south florida, and 5 months here in michigan. We have a great lawnman Bill, that keeps us informed on everything that is going on there. He sent me the pictures. He said that there was sufficient rain there this summer and the rest of our trees are doing great. 4 orange trees, 1 lemon tree, 2 grapefruit trees, 3 lychee trees, and 1 loquat tree. Actually the grass that you see under this grapefruit is just quack grass creeping over the ground under the tree. When I return there every year I pull all that grass under the trees and it is just bare ground. I fertilize the ground every year under the tree with a nutritional spray, post bloom, and fertilize with citrus fertilizer in January and late April. I have never pruned this tree. This has really got me stumped since I am notorious for having a green thumb. Any help would be appreciated.
We won't be going back to florida until Sept 26. When I get there I'll send you the pictures you asked for. My yardman said that 2 weeks ago the tree looked perfectly healthy with green leaves and green fruit. When I left Florida to return to Michigan May 1st. the tree was very healthy looking, with no lesions on the leaves or trunk. The grapefruit on that tree don't ripen until January. what would immature ripening of the fruit mean?