Fungus on Fruit Trees
I have Guava and Lemon trees. I see white fungus and Bugs on Guava trees and white fungus unders leaves on Lemon tree but no bugs. Guava get black spot mainly on top. I like to know what to use to kill fungus and bugs. Also, like to know what to do next year to avoid this problem.
Please see this extension publication for more information on growing guava (fertilization, insects and disease management, etc): http://edis.ifas.ufl.edu/mg045. PLease note that the pesticides mentioned are labeled for Florida; you will need to check with your extension office or read the label on products at your home store for products labeled for TX and fruit trees.