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Old 08-08-2012, 11:33 AM
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A mitey big ailment

I promised a while ago that I'd post pics of diseases and orchid ailments as I came across them. Take this as the first installment.
This plant is my Dendrobium bullenianum which I had brought inside to winter in warmer conditions. Unfortunately the warmer conditions were an ideal breeeding ground for two-spotted mites. A week ago this plant was a lush green all over but now as you can see a lot of leaves have been sucked dry of chorophyl by these nasty little buggers.

Severely damaged leaf on the left looking bleached. Leaf on the right is showing signs of mites spreading.


Damage to leaves showing typical webbing on affected foliage.


Adult mites are shown with red arrows. Juveniles/eggs are the circular objects within the blue circles.


After all this I have thoroughly drenched my plant with a miticidal soap solution. I hope it works with one application
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Old 08-08-2012, 01:18 PM
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Good luck, Dan. I hope it takes care of them. I've been dealing with a red mite infestation on several of my plants. Been treating them with alcohol baths with positive results so far.
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Old 08-08-2012, 01:33 PM
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Spray again in a week to be sure and get the eggs as they hatch.

Ugh. I've been dealing with some red mites on my plants also. Nothing to this extent, though. I mixed up some dish soap, cinnamon and rubbing alcohol. It's working.
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Old 08-08-2012, 01:46 PM
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Yuck! How unfortunate!
I had a mite infestation in my house a few months ago. I took everything outside and let loose some lady bugs. Did the job pretty well.
Also, used Neem and manual debridement of affected leaves.
Afraid to use chemicals around here as I have children who live near by and a dog that likes to get into everything. I also live upstairs, so don't want anything untowards floating/sinking down.
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Old 08-08-2012, 04:59 PM
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Thanks for the pics. I've been battling mites on my dens too. They tend to be a mite magnet.
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Old 08-08-2012, 05:09 PM
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Quote:
Originally Posted by bearded orchid View Post
Good luck, Dan. I hope it takes care of them. I've been dealing with a red mite infestation on several of my plants. Been treating them with alcohol baths with positive results so far.
Hi Phil,
Can you eleaborate a bit on the alcohol baths method? Straight 70% over the plant? Or do you submerge the entire plant in the container? For how long?

Would this work on other house plants like mini roses and hisbiscus? I lost a number of plants last winter as well. I HATE mites!

Thanks!

Lilia
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Old 08-09-2012, 04:16 AM
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I hate those things.

Lime-sulphur works well - can damage the occasional soft/new growth however.
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Old 08-09-2012, 02:42 PM
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One thing spider mites don't like is humidity. If you can get your humidity to around 60% you won't have as much of a problem.
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Old 08-09-2012, 03:03 PM
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I summered my orchids outside 3 summers, and fought mealy bugs and scale. This summer I kept all orchids in my basement grow room. No bugs this year, but my outside houseplants will be going up to the upstairs bedrooms. I hate using poisons.
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Old 08-09-2012, 07:15 PM
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Quote:
Originally Posted by rlilia View Post
Hi Phil,
Can you elaborate a bit on the alcohol baths method? Straight 70% over the plant? Or do you submerge the entire plant in the container? For how long?

Would this work on other house plants like mini roses and hisbiscus? I lost a number of plants last winter as well. I HATE mites!

Thanks!

Lilia
I just use straight 70% isopropyl alcohol. I either pour it into a spray bottle or put a spray nozzle on the alcohol bottle itself then apply liberally over the whole plant top and undersides and also spray the top of the media. Afterwards I sit them in a warm shady spot away from any drafts and let them dry off. It's important to do this after spraying them because the enhanced evaporation can potentially damage the plant cells if it is too cool or a draft is present. Do this a couple times over a two week period to nail any progeny you may have missed the first time and you should be mite-free

This has worked very well for me and is harmless to the plant and media. Hope this helps.
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