Macadamia Tree
Q.

25 yr old Macadamia Nut Tree . Zone 18. Last 2 yrs had leaf chlorosis, weak if any flowers, no nuts formed. No signs of disease. End

Zone Highland CA zone 18 | pman2000 added on March 22, 2019 | Answered

of life cycle No signs of disease in roots, trunk, etc, but leaves make the tree look like it's dying. pH 6.23, P and Zn high off the charts, low N ( have been adding feather meal over the last 6 months to no avail.) All other nutrients are within or nearly in target area.

A.
A.Answers to this queston: Add Answer
Downtoearthdigs
Certified GKH Gardening Expert
Answered on March 23, 2019

Your foliage looks like it has a combination of nutritional deficiency, foliage disease (possibly anthracnose).
You may need to do soil analysis and you may need the help of an Arborist to determine the specific disease cause and treatment plan.
This article has more information.
https://www.samac.org.za/wp-content/uploads/2016/08/PestDiseases_SymptomsManagement.pdf
You may also want to contact your County Extension Office to see if they have any help for these diseases in your region.
https://www.gardeningknowhow.com/extension-search

00
Was this answer useful?

Log in or sign up to help answer this question.
Did you find this helpful? Share it with your friends!

You must be logged into your account to answer a question.

If you don't have an account sign up for an account now.

Looking for more?
here are more questions about...
Macadamia Tree
Join Us - Sign up to get all the latest gardening tips!

Do you know a lot about gardening?
Become a GKH Gardening Expert

Learn More