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Orange tree disease

    6 responses

Paul2999 starts with ...
Hi all,

We have been trying to grow a Navel Washington Orange. There was one fruit on the tree when we first got it about two years ago but no fruit after that. It's currently north facing with direct sunlight.

We wonder if there is someone that can provide guidance on what the following is:

1) Reddish brown spots on the underside of leaves
2) Holes in leaves
3) Curled leave with web/foam-like substance on the inside

Please see the attached photos.

We appreciate your help!

Thank you
About the Author
Paul2999
Canberra
23rd June 2019 3:47pm
#UserID: 20467
Posts: 3
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Julie says...
Can you post a pic?
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Julie
ROLEYSTONE,6111,WA
26th June 2019 7:16pm
#UserID: 154
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Paul2999 says...
Yes, most certainly.
Pictures - Click to enlarge

Picture: 1

Picture: 2

Picture: 3

Picture: 4

Picture: 5
 
About the Author
Paul2999
Canberra
27th June 2019 8:34pm
#UserID: 20467
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Julie says...
I don't know what the pest might be, but your tree is severely undernourished. Pests do seem to be more attracted to unhealthy plants, so that could be a factor.

The wrong time of year right now, but as soon as it's a little warmer you need to give it a good dose of citrus fertiliser. It is especially lacking in nitrogen.

Healthy, well-fed trees will still get a few pests, but they rarely cause major problems.
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Julie
ROLEYSTONE,6111,WA
28th June 2019 9:06pm
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Original Post was last edited: 28th June 2019 9:09pm
Amanda says...
Gee that is one unhappy orange tree isn't it...I would be doing a pH test of the soil asap - it has a pretty severe nutrient imbalance. When did you last feed it and with what Paul?
I don't know anything about soils in Canberra - so maybe others will have more ideas about the issues with them.

The curled/rolled leaf is often a little spider inside or can be a very small caterpillar pupating - I wouldn't be too worried about that at this stage - you might find that when you have the tree a lot healthier that it will resist insect attack a lot better.
It's not a good idea to spray trees that are unhealthy/under stress like this anyway.
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Amanda
LESCHENAULT,6233,WA
29th June 2019 11:41am
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Paul2999 says...
Thank you Julie and Amanda for your helpful advice.

We will try getting a citrus fertiliser if that is what is missing. When do you suggest we apply it?

We actually have the orange tree in a pot not so that we do not have to start all over again if we move places. I think it is potting mix we added when we transplanted it into the pot. The plant hasn't actually changed much in height since we bought it.

We had the orange tree under partial shade but after a year or two of no growth, we moved it to its current north facing location. This is where our lemon and kumquat seemed to be doing ok. Strangely our kumquat is still not fruiting (next to the orange tree in photos).

Please see our photos attached of:

1) Full size of our orange tree (about 1m in height)

2) Tag details of our orange tree.

3) The liquid N.P.K fertiliser we last fed our orange tree around March 2019. Is this fertiliser unsuitable?



About the Author
Paul2999
Canberra
7th July 2019 10:39am
#UserID: 20467
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Original Post was last edited: 7th July 2019 10:44am
Julie says...
Try again!
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Julie
ROLEYSTONE,6111,WA
9th July 2019 8:41pm
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