On Aug 12, 10:07*am, Martin Brown
wrote:
On 11/08/2011 22:38, Pam Moore wrote:





On 11 Aug 2011 21:11:33 GMT, *wrote:

It took me many attemts to get a successfully rooting cutting from a
hibiscus shrub. Then when I finally succeeded, it got attacked by what I
guess was spider mites. I could see a load of minute dead white bus on the
undesides of the leaves and a few cobweb-like starnds too. The leaves all
sort of dried up, and the plant seems to have given up the ghost, despite
having grown decent roots. How does this happen? Can I revive the baby
shrub?

I just discovered red spider mites on my tender morning glory which I
had brought indoors because the wind was battering it.
Been away for a few days and noticed all the leaves looking mottled.
Tried to see them with a x10 magnifier but my eyes aren't good enough.
Got a friend to look and he saw the webbing as well, so it's outside
again and has been rained on and may get a spray of some sort. *They
are *devils, hard to get rid of, and it's a mystery where they come
from. *I've had no rsm for several years and have very few houseplants
these days.
They say that spraying with water helps as the rsm (not regimental
sergeant major!) thrive in dry conditions.

Spray or water with a systemic insecticide. Provado seems effective and
can be used either way (or both ways). Alternate with some other contact
insecticide you don't want to encourage them to gain immunity.

You have to make it very humid and steamy before rsm get discouraged.
I have never had a serious problem with rsm outside in the UK.

There is a predator mite for biological control though I have never had
any luck with it.

I do have some obscure mite that only target my snowdrops in spring, but
they just make the leaves go a bit silver. I asked for an ID once and
was told that it was only possible by electron microscopy of the mouth
parts. I leave them alone as the bulbs don't seem to suffer.

Regards,
Martin Brown- Hide quoted text -

- Show quoted text -

The trick with Phytoseilius is to monitor the spider mite population
closely and to introduce a proportionate number of predators
(Phytoseilius). If you put too many in they eat the rsm and then start
on one another. Too few and you fail to get effective control. The
'dead white bugs' the o/p saw were most likely the cast skins of
moulting aphids so a heavy infestation of rsm and aphids is suggested
as the culprits. As you advised - outside and treat with something
like Provado is likely to be the best approach at this late stage.

Rod