Of course they eventually reach as sort of stability but do not, as has been|
suggested, die when they eat up all the mites, they just die back. Thgis is
ecology at work, poor predator that eats ALL the prey and then starves to
Our Winter temps will kill them over here, but they persist in our
glasshouses at 45F, or enough of thenm do to over-winter and re-establish
in the spring.
So bearing in mind its temp. requirements it can be a VERY effective
1/ the predator is more susceptible to most sprays than the prey species.
2/ they apparently do not control well on one or two species, Passiflora is
reputed to be one of these.
Also a kite, it appears to me that they might control Brevipalpus (two
spotted spider mite) a serious pest of Pleione and several other
This is based on using them here over about three years or so, well four
just starting and the little devils are a delight to see zipping around the
leaves in the summer, they are large enough to just be visible with the
naked eye, especially the close-magnifying vision that seems to be one of
the few benefits of middle age.
Hope this helps
Paul Christian BSc PhD
P.O.Box 468, WREXHAM, LL13 9XR, U.K.
Tel 01978 -366399 Fax 01978 266466