> This may not be important but it may be the answer to a very large problem
> in tc labs. It stems from an observation I have made during many years of
> growing ( and tissue culturing ) orchids. Red spider mite and five spotted
> mites are significant pests in any greenhouse with long-term resident plants
> such as orchids, bonsia, etc. The crops are not rotated out -so once a mite
> population becomes established it is very very hard to control.
> We have found a majic bullet for controlling insect/mite populations in our
> collections.It is a mixture of light mineral oil (pharmacy), Neem oil,
> detergent(dish washing variety), and oil of eucalyptus(pharmacy). The
> mineral oil is a sticker and extender of the other constituents. The Neem
> oil is a broad-spectrum insecticide. The detergent is an emulsifier for the
> various oils and the oil of eucalyptus is a powerful miticide. Two important
> points about this mixture are; it is edible (non-toxic) and it has an
> extremely long residual effect. It seems that mites have a particular hatred
> of oil of eucalyptus. Two applications per year have cleared the entire
> greenhouse of these pests 100%, with no hazardous chemical use. Using
> synthetic products with serious potential for harm (personal and
> environmental) produced a losing battle in the same conditions (cygon,
> aramid, etc). Let me know if you would like the proportions.
> The reason that I am mentioning this is to suggest that a similar mix
> including oil of eucalyptus may be useful in the flask room. It may only be
> necessary to leave some trays of evaporating oil near the flasks to drive
> mites out of the area- or to combine that with an initial spray. I have not
> done any experiments with including it in the growing medium but that is
> another option that you might look at. I can tell you that mites go the
> other way when oil of eucalyptus is around.
>
> All the best,