Comments on: Olive tree diseases and pests

By: Jan Henry Sultan

Jan Henry Sultan — Wed, 08 Sep 2021 04:09:02 +0000

I appreciate the broad look at the diseases that affect olive trees. Im wondering if there is a “shotgun” fungicide/pesticide that gets the broadest impact on the various fungi and insects. I too have a large ornamental olive that gets dusty white on the leaves and has some kind of insect that leaves sort of a sticky residue. The tree gets stress from whatever these conditions are and Id like to know a general spray that I can use. Thanks.

By: Antonio

Antonio — Fri, 25 Dec 2020 12:37:12 +0000

In reply to martin green.

Hi Martin,

I think you have done a good job taking care of the olive tree. Soil fungi are difficult to treat and usually affect centuries-old olive trees without apparently great consequences. Improving soil drainage and reducing the presence of moisture near the trunk can help. Also the treatment with soil fungicides, techniques such as solarization or raising the pH somewhat with slaked lime could help.

A greetings

By: Debra L Taylor

Debra L Taylor — Sun, 22 Nov 2020 03:21:43 +0000

I am trying to find a certified tree doctor(arborist) for a fruitless olive tree. The tree was last cut in October of 2019. I have notice the three large branches have large amounts of brown leaves. I have never seen the tree like this so I am thinking it is diseased. The tree is at least 50 years old with a 4 to 5 foot around trunk with a 14 to 18 foot height(I think). I need a certified tree person for diseased trees specifically olive trees that can consult with me to tell me what needs to be done make and keep the tree healthy and is near my area. The tree is absolutely gorgeous and want to keep it healthy. I live in Oxnard California (Ventura County)

By: martin green

martin green — Wed, 07 Oct 2020 08:56:19 +0000

Hi I have a new mature olive tree. It has had Peacock spots and yellow leaves. I have removed affected leaves, pruned to open up the tree to light and air, also sprayed anti fungal each month during summer and autumn. But I noticed a white fungus growing at the earth line soon the main trunk.It is white with brown tinged and when removing it inside is tough pink and flesh like. I removed as much as possible and have sprayed entire area with anita fungal treatment. There were also white miscillea in the surrounding soil. I suspect I need to improve soil drainage but would appreciate and advice from the experts?
Many thanks and kind regards
Martin