Q.My Avocado Tree’s Fruit Is Turning Black, Shrivaling Up And Droping
in the last month or two my tree started to thin its heavy crop of avocados. I thought it was normal and ignored it. now, the fruit is shriveling ,turning very black, while its still on the tree. then it drops off. i was told to water more. The tree is growing in the ground, near orange citrus, on a slight in cline. what can i do?

Certified GKH Gardening Expert
It could be fruit or stem rot. These references should help pinpoint the problem and how to manage it:
http://ipm.ucanr.edu/PMG/C008/m008fpfrtdmg.html
https://www.gardeningknowhow.com/edible/fruits/avocado/avocado-pests-and-diseases.htm