Im wondering whats under the tree (I can see pebbles in the pic) and whats the airflow like in the area?
High Nicolas - yep it's got sooty mould. Very common, especially as it's been so humid lately. There are a few things you can do about it. Most labour intensive is to gently "scrub" (emphasis on gently!) each leaf with a soft toothbrush and warm water, which gets the goop off and allows it to photosynthesise. Much less labour intensive is to spray it with a good natural antifungal - I use diluted worm tea. I do both; I go over a particular area with the soft toothbrush, then spray it with worm tea. Every couple of weeks I scrub a new patch and then spray - do this a few times and you will end up with a "clean" tree and a very healthy one due to the beneficial effects of the worm tea. It will then be more resistant to further infestation
Kali is on the money. I had the same thing due to aphids. Sooty mould insued. Whitefly too. I used pyrethyun spray fortnightly. I haven't washed the leaves but I did pray with soapy water. Worked rather well.
Looks like sooty mould to me too. Prune it to let in more sunlight, and make sure you don't let long grass grow under it.
That's probably whitefly. Shake a branch. Do lots of little white flies come off? Go here for more info. http://ooooby.ning.com/profiles/blogs/getting-rid-of-those . I have been working on mine for a few years now and have managed to minimise them but not get rid of them.
yeah, looks like a big effort... thanks for the advise
well you can apparently clean it off with soapy water, that would also deal to the insects such as aphids which supposedly secrete a honeydew substance that attracts the mould. I have it on my trees at times but I am too lazy to do anything about it...would be worth it on a small tree because it blocks photosynthesis on the affected leaves.
thanks Kali, any way to treat it?
that looks like sooty mould
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