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 Post subject: Did I bring a virus?
PostPosted: Thu Nov 12, 2015 3:51 am 
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I didn't find ant special topic about sickness and now writing to the general orchid chat.
I have two problems with some of my guys:

1 - yellow spots on leafs (seems live virus very much for me)
2 - sweet drops on the edges of leafs and peduncles

I am not sure that there are results of the same problem.
Please, look at the images.
I would be very appreciate your advice.

Thank you very much.


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 Post subject: Re: Did I bring a virus?
PostPosted: Thu Nov 12, 2015 9:10 am 
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Hi Shavedhead,

The sugar drops is actually happy-sap (weird name) and it's the sugary postproduct of the plant. On many occasions it appears on the flowers and new growing branches of the plants. Many scientists think it attracts ants which then would protect the plant.



Rob

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 Post subject: Re: Did I bring a virus?
PostPosted: Thu Nov 12, 2015 10:01 am 
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My first thought would be sap sucking insects that have introduced a fungal infection into the leaves rather than a virus. This would also explain the tiny drops of secretion on the plant (where the insects have bored a hole). Many plants do produce sap that appears on the tips of leaves or the flowers but it does not usually appear on the spikes as shown in your pics.

I would suggest an insecticidal spray and keep an eye on those spots to see if they get any worse.

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 Post subject: Re: Did I bring a virus?
PostPosted: Thu Nov 12, 2015 5:37 pm 
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Thank you folks.
I took some more images of that disaster.
Only phalaenopsises have that problems but almost all of them (12) :-(


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 Post subject: Re: Did I bring a virus?
PostPosted: Thu Nov 12, 2015 11:51 pm 
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What are we looking at on that last pic? I can't make it out. Liquid, scale, indentations?

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 Post subject: Re: Did I bring a virus?
PostPosted: Fri Nov 13, 2015 4:33 am 
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I guess yellow spots at leafs becomes indentations like these.


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 Post subject: Re: Did I bring a virus?
PostPosted: Fri Nov 13, 2015 8:07 am 
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Well I f they are indentations it points further away from virus and more towards a fungal attack.

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 Post subject: Re: Did I bring a virus?
PostPosted: Fri Nov 13, 2015 1:55 pm 
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on 5961 at the very tip there apears to be some little white sopts which look like mealy bug.Its not virus so don't worry,it could be that fungus has caused the yellowing spots,where sap is being secreated, but most likely where these little blighters have been feeding.The first explanation is also very likely but ants also use the mealy bugs like cows and milk them for the sweet sugary solution they produce and actually protect the mealy bugs instead of the plant!(the best of both)Ants are very clever!


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 Post subject: Re: Did I bring a virus?
PostPosted: Sat Nov 14, 2015 1:48 am 
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Thank you very much.
I used insecticidal soap spray to all orchids.
How deep I have to use it for roots? flowerpots?
Should I use insecticidal spray to the other plants at home as well?


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 Post subject: Re: Did I bring a virus?
PostPosted: Sat Nov 14, 2015 11:51 am 
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It would be s good idea to spray all of your orchids as a preventative measure and to repeat the spray in a week. Then keep an eye on the plants and repeat again if you see any further activity.

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 Post subject: Re: Did I bring a virus?
PostPosted: Sat Nov 14, 2015 3:18 pm 
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What about the other plants except orchids?
Should I spray them as well?


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 Post subject: Re: Did I bring a virus?
PostPosted: Sat Nov 14, 2015 4:02 pm 
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If you think that there is a possibility of your other plants harbouring pests then it would make sense to spray them as well.

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 Post subject: Re: Did I bring a virus?
PostPosted: Sat Nov 14, 2015 4:08 pm 
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Those indentations and spots on the phal suggest the false spider mite (brevipalpus). They are usually lurking around under the leaf bases in the crown of the plant and very hard to see even with a x10 hand lens (look for the nymph cases, reddish and egg shaped, you'll need a good light source to go with your hand lens). They suck the sap and then the damage shows as the leaf grows out. Assuming you find evidence of brevipalpus, they can be dealt with. I had it once on a phal, the only spray that works are the ones based on plant oils, but if you make sure to soak the crown (and then dry off afterwards to prevent rot) every 3 weeks for 3 sprays you should eradicate them.



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 Post subject: Re: Did I bring a virus?
PostPosted: Sat Nov 14, 2015 5:28 pm 
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Thank you very much everybody!
I appreciate your help.


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