> g'dat tonto,
> most likely going to becasued by infestations of either scale insect or
> mealy bugs, most of those black sooy appearances caused by the sugary
> sweet excrution the bugs put out and that is what the ants use as food so
> you should see ants as well.
> the only othe time i have seen black soot on trees is when they are right
> beside a major road and they get stained by diesel air emissions. my
> money's on the bugs.
It's just near a roolly, roolly big road, but there's no diesely looking
stuff on anything else, so I reckon it might be scale or mealy bugs - I've
seen lots of ants around the trees, so they might be farming the scale
insects as others have said.
I'll give the white oil a go (saw a DIY recipe for it on Gardening Australia
the other night), see if it helps.
Thanks for all the help, folks.
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> most likely going to becasued by infestations of either scale insect or
> mealy bugs, most of those black sooy appearances caused by the sugary
> sweet excrution the bugs put out and that is what the ants use as food so
> you should see ants as well.
> the only othe time i have seen black soot on trees is when they are right
> beside a major road and they get stained by diesel air emissions. my
> money's on the bugs.