Gardening with Gary
Gardening Advice from an Expert
Scale
Q. I've had rubber tree plants for years, but never with this recent problem.
There are round/oval dark brown to blackish little things that are sticking all
over the leaves and stems. They look like they could be bugs on top but when I scrape
them off and look under them it is more like a shell and they are easily cracked
to pieces with my nail. I've looked everywhere for an answer to this and I read
of something called "scale(s)" but cannot find a picture to identify it nor can
I find anything to tell me just what "IS" a "scale" if this is what it is and how
do I get rid of them for they are spreading and destroying my rubber tree plant's
leaves.
A. You have indeed done your homework and are sadly correct. The bug infestation
which you describe is Scale. They are nasty prolific creatures and very hard to
eradicate.
The outside of them looks like a small shell, dark brown in color. If you peel
one off, the underside is white and soft-cottony. Squish it to kill it. They are
hard to get rid of because the shells protect them from chemicals. Therefore, you
must get to the undersides to kill.
The method to do this is a systemic insecticide. Its application, whether as
a spray or a drench into the soil, enables the chemical to get inside the system
of the plant [like blood vessels]. As the scale eats the tissue, it ingests the
chemical and dies. It is timely and many times kills the plant along with the scale
if done for an extended period of time.
Ortho makes systemics to use against scale. Go to your local nursery or garden
center and read the labels. Apply exactly as the label states and use care to avoid
breathing the chemical and getting any on your hands and clothing. Use caution.
Outside treatment is preferred and keep the plant out of the sunlight.
Followup applications are necessary as the eggs hatch and start the whole cycle
again.
I had it on ferns and ended up discarding the plants in disgust. Be sure the
scale does not spread to other nearby plants, and good luck!
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