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How does spider mite attack actually kill a plant?
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 |
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