Avocado Browning of new leaves - canker? (forum)

Danyboy starts with ...
Hello all
I've been trying to figure out what's been happening to my recently purchased lamb Hass which I've just transplanted into a pot from the nursery.
The problem seems to be affecting young leaves at the top (see pic) and part of the stem. I wonder if it's canker and if I should just chop the top stem off?

He alternative would be sunburn, but not sure if this is consistent with the appearance I've seen in other pics. Thank you!
Pictures - Click to enlarge

Picture: 1

Time: 12th December 2017 1:21pm

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Fruitylicious1 says...
Hi Dany;
Definitely your young avo leaves and stems are sunburnt. Situate them in a dappled shade or on the eastern side of the house so they can only receive morning sun and avoid the scorching afternoon afterburner. Alternatively, you can erect a 50% rated shade cloth as sunburn protection. Also, paint the exposed trunk and stems with diluted white water base interior house paint. Another option is spray your beloved avo with Yates Droughtshield sun and frost damage protection. If you ignore these urgent necessary precautions your avo tree will surely become an expensive compost ingredient a lot sooner than later.
Happy Gardening :-)

Time: 12th December 2017 8:22pm

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Original Post was last edited: 13th December 2017 6:34am

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Danyboy says...
Thank you fruity!
Glad it's not some nasty disease... Will start by moving her out of the arvo sun before I paint her

Cheers

Time: 13th December 2017 9:14am

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Danyboy1 says...
Just an update
I moved the plant out of the sun and into a spot that gets a couple of hours of morning sun only. Mulched and watered making sure there was good drainage.


It appears as though whatever was happening has progressed. The leaves in the first picture died and there are small black spots on the stems adjacent (see new pic). I pruned the top of the stem with the dying leaves (can also see in pic). There are 2 branches to the tree and he other branch does not seem affected. Is this still sunburn? Or is something more sinister going on?

Thanks!
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Picture: 1

Time: 21st December 2017 8:41am

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Danyboy1 says...
2 more pics in case the first one isn't clear
Pictures - Click to enlarge

Picture: 1
Picture: 2

Time: 21st December 2017 2:55pm

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Fruitylicious1 says...
Hi Danyboy
Prune the affected part just above a healthy node. Perform a sloping cut and seal the wound with a grafting wax or Vaseline if you don't have a wax to prevent RE-entry of any bugs.
Your avo might be infected by anthracnose caused by the fungus colletotrichum gloeosporioides. It is usually triggered when there is a lot of rain and moisture for more than 10 days and temp is above 15c. Spray the whole plant with a registered fungicide and follow the manufacturers specs ASAP monthly until May to get rid of the disease.
Happy gardening :-)

Time: 22nd December 2017 9:36pm

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Original Post was last edited: 22nd December 2017 9:57pm

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Danyboy1 says...
Hi fruity

Thanks for the advice. Have taken your instructions and applied them. hoping for the best!

Time: 29th December 2017 5:55am

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