I have 2 large gardenia trees that I winter over in my greenhouse...they
have mealy bugs, scale and black mold.
Is there any organic product I can use that will not defoliate the plants?
If not, what non-organic product would you recommend?
I spray with malathion, but only when I see the pests proliferating.
These pests can destroy the contents of a greenhouse because the insects
that prey on them generally stay outside.
The black mold (sometimes called "sooty mold") grows on the sugary syrup
exuded by the mealy bugs and scale (and by aphids). Get rid of them,
and the mold will disappear.
David E. Ross
Climate: California Mediterranean
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