Citrus branch disease? (forum)

Mel H starts with ...
Hi, I’m in Cairns QLD and hope someone might be able to help identify this problem. This potted lemonade is about three years old and is covered in flowers/fruit, the first year with well over 50+. However, I’ve noticed these red spots appear and now in almost all branches at different stages, these photos show the worst where I started to scratch off bark with my fingernails. Other red spots can be ‘scratched off’ but there are too many. I’ve got information overload off the net but difficult to diagnose as most websites show damaged fruit not branches.

I haven’t treated with anything but do have copper spray, white oil and Sulfur powder on hand. Anything else would need a trip to the shop :)

Would appreciate any suggestions (hopefully where my lemonade tree lives a long and fruitful life).
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Time: 1st August 2020 6:22pm

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About the Author Mel H
REDLYNCH,4870,QLD
#UserID: 23549
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jakfruit etiquette says...
Its a bit hard to see the extent of the problem from the pics. Because of your location in the humid tropics there can be a lot of microbes causing problems.
Copper oxychloride could be sprayed or painted on the areas as a paste. Another thing to consider is ecocarb
https://ocp.com.au/product/fungicides/
its based on Potassium Bicarbonate.
You could inspect the plant to see if the damage is only on one side or only the upper surface of the branches to see if something like sunburn is also a factor.

Time: 3rd August 2020 10:01am

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About the Author jakfruit etiquette
gotham city,3000,Vic
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Mel H says...
Fascinating! I shall research citrus fungus now and look into ecocarb. I'll let you know how it goes. Thank you very much for your response! I apologise mine has taken so long! I've taken some more photos to show a little more clearly. I find it so interesting but alarmed at the same time as I love my trees.
Pictures - Click to enlarge

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Picture: 5
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Time: 11th August 2020 11:14am

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REDLYNCH,4870,QLD
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Mel H says...
Tree looks much better from a distance ☺️
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Picture: 2

Time: 11th August 2020 11:29am

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About the Author Mel H
REDLYNCH,4870,QLD
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jakfruit etiquette says...
Im wondering if an insect is involved, each bud eye seems damaged or chewed ??
It also looks like how some bud eyes die under tape when budding/grafting fails.
This seems to be a fungal or bacterial infection. It could be both, damage then infection ??
How is Redlynch ATM ?? Is it very rainy and humid ??

Time: 18th August 2020 9:40am

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gotham city,3000,Vic
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Posts: 915
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