From: Ken Mosher <ken at spatulacity.com> on 2007.04.25 at 22:47:07(15591)|
Michael is right, they supposedly don't do well if you raise the
humidity. I had little luck with that approach, however. If your friend
thinks they like Amorphs then he should get a Typhonium venosum and
stick it in the corner. They will all go to that corner!
Common wisdom with the two-spotted spider mite is to spray with 2 or 3
different miticides according to the label directions but *rotate* the
chemicals used. Spider mites develop immunity quickly because of their
short breeding cycle. I had reasonably good results on my Ty. venosums
last year when I rotated Kelthane and an Ortho product called "Systemic
Insect Killer" with active ingredients Acephate and Fenbutin-oxide (the
label says "Formerly Isotox" but I don't think Isotox had the same
ingredients). The Ortho product is VERY smelly! Ugh.
He might also try spraying those infested plants with Messenger a couple
of days after the miticide. At the very least it won't hurt them and it
may give them a boost.
D. Christopher Rogers wrote:
Anyone have a good method for dealing with spider mites? The keep
popping up in my friend’s greenhouse. They really seem to like
Amorphophallus, Xanthosoma, Alocasia, and Colocasia, ignoring everything
else. He has been using neem oil, but it seems to kill off leaves. He
went to a weaker concentration, which knocks down the mites immediately
and saves the leaves, but even after spraying twice a day for two weeks,
they just pop right back up. They appear to be the two-spotted spider mite.
Thank you in advance,
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