"Claudio Fierro" wrote in message
...
I have two questions about fumigation:
First; is it right to make it in a preemptive way? If so, could anybody
explain me when to make it and agains what kind of
insects/fungi/spiders/etc
and with what agents? And another question about the use of oil based
pesticides
against spiders and aphids: Is it safe for our bonsai to use them? Does
it affect in any way our soil if it becomes wet with that kind of solution
(maybe the water retention?)?
Thank you all.

Don't apply any chemicals unless any targets are there. Applying it before
you see the targets can/eventually will cause resistant pests/fungus and
then you will have all sorts of problems.
Oil based pesticides are safe to use, but careful when using white oil/pest
oil, a petroleum based spray used to suffocate pests, mostly spider mites,
aphids and scale. As a bonsai is so small, it is quite easy to cover all the
foliage, which is needed on the topsides of the leaves, but careful not to
cover undersides of the leaves as it can suffocate the plant.
Some chemicals will become inert when it hits the soil, others may stay in
the soil for 6months, you have to read the instructions to know what's what
and the effects it has on soil. They won't harm the plant, but careful with
the soil for your own safety.
Finally mix at the suggested rate, don't weaken it cos a bonsai is small.
Most of all follow instructions carefully, especially taking note that the
plant isn't waterlogged, soil extremely dry, or suffering from heat stress
at time of application which are common rules for most chemical
applications.

Good luck
Claudio Fierro Neudörfer


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