I've had this cactus for almost 20 years. In the past year or two my
cactus has come up with either a fungus or some kind of bug
infestation. An oval patch about 5" long and 3" wide has kind of either
dried out or eaten away at the side of the plant causing a sort of
hollowing out of 1/3 of the thickness. The plant otherwise seems
healthy and has the same kind of leaf growth in spring as always but if
this hollowing out business keeps going on she'll soon topple over. If
there is another cactus lover or plant person who can offer some advice
before that happens I'd be really grateful. Here's 2 photos of her.
I don't think this will help you very much, but if it were mine I would put
a systemic fertilizer/bug killer in the pot (follow directions). The
fertilizer will be absorbed by the roots and circulated through the plant.
That will take care of any bugs it may have. Then I would ask my extension
agent to look at it and make a recommendation. I use Captan on my grapes to
prevent fungus, but this might not be fungus.
I lost my cactus after 20 years, but I think it was because it got too big
to leave out in the wind during the summer, and it needed the sunshine.
With the pot on the floor, it extended to within 6 inches of the ceiling.
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