A Very Scalely Situation?

0

Joyce T. wrote:
My hibuscus bushes (verigated as well as regular ones) have been thriving;
however, some have now developed shriveled up leaves with black on them, as well
as some white stuff on them, which seems to be killing them. What is causing
this, and what can be done to treat it?

Dear Joyce:
No doubt the black is caused by scale. Might be mealy bug or cottony cushion scale.
This black sooty mold grows from the insects excretion. Find an insecticide that
labels itself for hibiscus. This may take a couple of applications used according to
label instructions.
My Best,
Stan