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Old 07-08-2015, 11:47 PM
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I've got some really sick plants - need help

Over the last month or so a few dozen of my orchids (different varieties) have gotten either virus, bacteria or some pests. Probably all 3. I'm still a novice so while I know something is wrong I am not sure exactly what.

Take a look at the attached photos and reply back with any comments / ideas on what it could be and any action I should take. Most of these are unique photos meaning only 1 photo per plant but there are a few duplicates in here taken of the same plant.

some look like rot, some look like they are being eaten, the worst ones the leaves are disintegrating in front of me.

I have them separated from all the others but every other day I find a new one among the healthy. I'm afraid they all have one things or another. :-(

Thanks in advance.
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Last edited by monk707; 07-08-2015 at 11:59 PM.
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Old 07-08-2015, 11:49 PM
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part 2

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Old 07-08-2015, 11:50 PM
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Part 3

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Old 07-08-2015, 11:52 PM
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part 4

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Old 07-08-2015, 11:53 PM
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Part 5

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Old 07-08-2015, 11:54 PM
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part 6

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Old 07-08-2015, 11:56 PM
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part 7

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Old 07-09-2015, 12:20 AM
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Looks like snails, and possibly a few grasshoppers too! My worst enemy when growing outside is the grasshoppers. You can try some Sluggo around your grow area. I find diatomaceous earth also works quite well. You might want to check your potting media for the evil creatures, slugs Especially like to live in the media and come out to munch at night.
It also looks like you have some sunburnt plants. Photo no. 6 and 8 look sunburnt to me.
As for the spotted ones (photo 2&3) I'm not so sure. I would probably start with testing for ringspot virus. You can get test strips at Agdia.com.


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Old 07-09-2015, 12:23 AM
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And a lot of those phals look pretty underwatered too.


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Old 07-09-2015, 01:30 AM
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Lets see…

There's slugs/snails, mealybugs, maybe acarians, deshydratation (a lot), certainly overwatering from up-down with leaves going rotten/fungal… Somme with he spots have met some sucking insect. Lots of burns!

- keep those leaves DRY, especially those with burns, snail bites.
- kill the mealies
- take a magnifier and have a look at all yellowing leaves, up and down sides of leaves for acarians.
- have a look at the roots of all the deshydrated ones, pots are certainly too big and you don't manage sphag well obviously (let things dry!).
- the leaves with black roud spots of large dark zones (not burns, but jagged areas) should be monitored closely, it's acidovorax and can kill a phal in 2 days if it goes suddenly fast. Don't water the leaves!!!!!!!!!! don't touch then go to another plant (bacteria highly contagious). If possible cut largely the zones, but given the state of plants, keep it sanitized and watch every day, make marks with a pen, to see if it moves. You can put some bordeaux mixture or sulphur on the leaves to help prevent the spread in a soft way. (no Bordeaux on dens!)

I think you have a general cultivation issue, you should thoroughly see with us how you are cultivating, as there's something obviously wrong.

On some plants, you have spots I think are suspicious, those I'll keep really separated from the others :
1-7
2-6*
3-3
4-3*

Those, I'm not sure what it is, (*) traces of sucking (Brevipalpus acarian+associated fungus and toxins, (* and others) or worse first signs of virus (especially if it's the oldest leaves!) Only time or a test will tell. First check and treat for acarians (anyway all should be treated not only those listed), then fungicide (chemical, systemic) a few days later.

Sorry not to go through each pic, it's overwelming and I don't have the time and energy.

Remember to wear full protections and do it outside while treating.
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Old 07-09-2015, 07:47 AM
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So many pictures make it hard to respond to any one plant or problems. I agree w/the too much water and bacterial problems, as well as the slug damage. I also see scale in those pics. As well as some show signs of sunburn. To start with...you need a good systemic insecticide to stop the scale and other nasties that are taking over your orchids.


If you're placing your orchids on the ground...get them up somewhere. On the ground plus wet = severe slug damage. Putting them up won't eliminate 100% of the damage but it will make it hard for most to get to the plants.



Your phals appreciate bright shade and want to be moist but not soggy wet.

Generally, most catts and dens need to dry out between waterings and like more light than phals but will burn up in full sun.

If you're using a bark based medium then all orchids will do best in a pots just large enough to accommodate their roots plus a little room for growth. When first starting out and learning...it's probably best to do a little too small than too large as it affects the dry time of the roots.
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