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#1
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Red Spider Mite
Anyone know if the eggs of these can remain dormant for many months? I
understand that the adults can overwinter, but what about the eggs? I have a plant (Brighamia insignis) which is kept in a bay window with several other plants. Every year, at this time, it gets a heavy infestation of RSM. None of the other plants are affected. A spray of thiamethoxam and abamectin seems to kill off the mites (although not before they've done a lot of damage). I repeat the spraying after 2 or 3 weeks to kill off any which have hatched from the eggs already laid at the time of the first spraying. This year I thought I saw a bit of a web a few weeks ago, but it didn't seem to spread. At no other time of the year, or in previous years, have I seen RSM on these or any other plants, and the window has not been opened, so where are they coming from? -- Jeff |
#2
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Red Spider Mite
On 01/09/2011 16:28, Jeff Layman wrote:
Anyone know if the eggs of these can remain dormant for many months? I understand that the adults can overwinter, but what about the eggs? I reckon they can too. It is surprisingly difficult to be rid of them if you have anything that can act as a serious host. Growing something sacrificial as an indicator plant and maintain eternal vigilance is the only way. In a greenhouse you can try the predator mite and in a warm summer (not this one) it will do some good but indoors it doesn't work. I have a plant (Brighamia insignis) which is kept in a bay window with several other plants. Every year, at this time, it gets a heavy infestation of RSM. None of the other plants are affected. A spray of thiamethoxam and abamectin seems to kill off the mites (although not before they've done a lot of damage). I repeat the spraying after 2 or 3 weeks to kill off any which have hatched from the eggs already laid at the time of the first spraying. If they still do them Phostrogen did a plant pin that worked OK as an anti red spider mite treatment on a fire and forget basis for most of a season. This year I thought I saw a bit of a web a few weeks ago, but it didn't seem to spread. At no other time of the year, or in previous years, have I seen RSM on these or any other plants, and the window has not been opened, so where are they coming from? Eggs in tiny nooks and crannies. You have to hit them every two weeks for ages to get every last one. I suspect they have staggered maturity or something. Certainly the eggs will survive sprays and smokes. Regards, Martin Brown |
#3
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Red Spider Mite
On 01/09/2011 16:37, Martin Brown wrote:
On 01/09/2011 16:28, Jeff Layman wrote: Anyone know if the eggs of these can remain dormant for many months? I understand that the adults can overwinter, but what about the eggs? I reckon they can too. It is surprisingly difficult to be rid of them if you have anything that can act as a serious host. Growing something sacrificial as an indicator plant and maintain eternal vigilance is the only way. In a greenhouse you can try the predator mite and in a warm summer (not this one) it will do some good but indoors it doesn't work. I have a plant (Brighamia insignis) which is kept in a bay window with several other plants. Every year, at this time, it gets a heavy infestation of RSM. None of the other plants are affected. A spray of thiamethoxam and abamectin seems to kill off the mites (although not before they've done a lot of damage). I repeat the spraying after 2 or 3 weeks to kill off any which have hatched from the eggs already laid at the time of the first spraying. If they still do them Phostrogen did a plant pin that worked OK as an anti red spider mite treatment on a fire and forget basis for most of a season. This year I thought I saw a bit of a web a few weeks ago, but it didn't seem to spread. At no other time of the year, or in previous years, have I seen RSM on these or any other plants, and the window has not been opened, so where are they coming from? Eggs in tiny nooks and crannies. You have to hit them every two weeks for ages to get every last one. I suspect they have staggered maturity or something. Certainly the eggs will survive sprays and smokes. Thanks. Just means I'll have to be even more vigilant! I don't want to lose this plant, and it has been completely defoliated in the past by RSM. What is particularly annoying is that the flower buds start forming at this time, and either the RSM or the spray causes them to abort. :-( -- Jeff |
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