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HELP Avocado Black Spot

    4 responses

Amanda19 starts with ...
I purchased 12 avocado trees 2 weeks ago (8x Wurtz & 4x Shephard)dwarf/semi dwarf variety, and over the past week almost all have black spots on them! At first I suspected sunburn, so moved them into a more sheltered location, but the black appears on both sides of the trunk/ branches on some. The black spots are mostly found around the base of the trunk, grafting point and some arms. A couple of branches have completely died back, gone black and softened. I suspect disease, but not sure what I should treat with? They are still in the original black bag I bought them in as I'm waiting for weather to cool to plant them in the ground. See attached pictures. Can anyone offer advice?
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About the Author
Amanda19
Bindoon
18th March 2015 4:13pm
#UserID: 11475
Posts: 2
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Brendan says...
Hi Amanda19, gee they look sick! They may be too far gone:-(
Try spraying your avo trees with: 30g (level tablespoon) of Copper Oxychloride mixed with 4 litres water, and with a 'good' wetting agent added. Also,cut off the dead bits.
Spray once a week for 3 or 4 weeks or until it's gone, good luck!
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Brendan
Mackay, Q
19th March 2015 3:52pm
#UserID: 1947
Posts: 1718
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Amanda19 says...
Thanks Brendan. I ended up buying some Yates anti fungal solution which contains copper and targets anthracnose and black spots. I didn't get a chance to use it yesterday so was going to give it a crack today? would mixing straight copper be better do you think? Can't believe I've only had them a little over 2 weeks and they've taken such a turn!
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Amanda19
Bindoon
19th March 2015 7:51pm
#UserID: 11475
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Original Post was last edited: 19th March 2015 7:51pm
Brendan says...
Hi Amanda19, yes that Yates product should work fine, please don't use 'straight copper' as in copper sulphate, as it will kill your trees.
Don't forget to use a wetting agent like Spredmax or Chemwet, please don't use a soil wetter for the wetting agent.
And spray once a week for 3 or 4 weeks, or more.
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Brendan
Mackay, Q
20th March 2015 8:50am
#UserID: 1947
Posts: 1718
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888 says...
Hi There,
My ntree has lots of avocado but they are falling,while still relatively small,with black marks on them,would anyone know the cause.
thanks
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888
Endeavour hills
22nd January 2019 3:09pm
#UserID: 19691
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