Problems with my lanes late orange tree (forum)

Slicko starts with ...
The pictures below show diseased parts of the most recent flush on my lanes late orange tree. The diseased part covers about half of the circumference of the branch. Upward of the diseased part there is increasing choloritic effect on the leaves. In places there are shiny parts where it appears as though sap has emerged and hardened.

It effects a significant part of this last season's flush. Tree was planted in mid year 2014 and is on dwarfing rootstock.

The disease is not evident in my remaining five citrus trees.

Obviously I would like to know what the problem is and how I can deal with it

Mick
Pictures - Click to enlarge

Picture: 1
Picture: 2
Picture: 3
Picture: 4

Time: 1st August 2015 10:21pm

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jakfruit etiquette says...
It looks like the after effect of mechanical damage, ie sucking insects, climbing snails. I would inspect for pests, inspect at night with a torch, and with magnifying glass for tiny pests ie mites.

Time: 2nd August 2015 12:02pm

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Markmelb says...
To me it looks like root damage - the plant has lost its hydraulics?

Time: 2nd August 2015 2:51pm

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jakfruit etiquette says...
That alone could explain the wilted tip shoots, but that could also be sap sucking bugs, (siphoning off the hydraulics).
The grey scarring on the twigs seems to also be involved.

Time: 3rd August 2015 8:56am

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Original Post was last edited: 3rd August 2015 8:56am
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Slicko says...
Thanks guys for your comments.

Assuming that it is loss of hydraulics within the plant and not insect or mechanical damage how do I deal with that? I imagine that it is not simply a case of watering the plant but something more complex

Mick

Time: 3rd August 2015 10:56am

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Brain says...
if I may chime in my 2 cents. I would cut the affected parts off (in case it's fungal) and add diluted seasol/fish emulsion until new flushes start in spring. The plant should regrow. Citrus does have a lot of resilience and can come back with good care.

Time: 3rd August 2015 5:40pm

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About the Author Brain
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Slicko says...
Thanks everybody for your continued interest in my orange tree.

I am reluctant to take more vegetation off the tree as there is another lesion halfway up the main stem and to do so would leave me with not much tree left.

I have treated it with a copper fungicide and intend to spray it with horticultural oil in the next day or so. I understand that Mancozeb plus is a combined miticide and fungicide so I'll give it a breather before I hit it with that. The other citrus trees all appear healthy.

The Washington navel is showing signs of emerging new growth and flowers however none of the other trees are that far advanced so it may be a few weeks before the lanes late displays new growth.

I did some research on the hydraulic situation and now understand to a basic level of what it's about. I don't recall any root damage when I put it in the ground. All very interesting stuff!

Mick

Time: 3rd August 2015 9:16pm

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jakfruit etiquette says...
I dont think its root damage, but root damage can be caused by borers + weevils eating the roots, fungal infection girdling the roots etc, not just direct damage at planting or digging near the tree. Usually fungal infections of leaves and stems show some signs of sporulation/ fungal hyphea/mould activity etc.
Good Luck.


Time: 3rd August 2015 11:26pm

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