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-   -   What are these yellow spots on Phal. leaves (https://www.orchidboard.com/community/pests-and-diseases/105256-yellow-spots-phal-leaves.html)

nuriko1set 11-17-2020 10:09 PM

What are these yellow spots on Phal. leaves
 
7 Attachment(s)
Hello!
Can anyone identify these yellow spots? I have them on 2 phalaenopsis orchid leaves. I got both together a few weeks ago, when they arrived there were some cobwebs on them. They were shipped in. I thought had spidermites, so I sprayed them both with a mixture of neem oil, water and handsoap. Although the webs don't looks like the spidermite webs, but I sprayed just in case. I THINK I have not see any signs of mites. They did not have yellow spots until a couple of weeks ago. They were in quarantine under a red/blue grow light. I thought they were doing ok, so after they've been in quarantine for at least 2 weeks, I moved them into my regular grow are with a stronger grow light. Then I noticed they developed yellow spots. They seem to have different causes and I listed them below:

1. Here is the first plant. It has these marks underneath the yellow spots. The marks look like they were maybe punctured accidentally, they don't look like insect bite marks. The yellow spots are on the same spot on the other side of the leaf. Here are the pictures of the yellow spots on the top side of the leaf and the puncture marks on the underside of the leaf.
Attachment 148824

Attachment 148825

2. This plant also has another yellowing spot. I feel like this one maybe an infection? Here is a photo of the spot from the top and the underside, which doesn't show any anomalies (I think).

Attachment 148826 Attachment 148827

3. This is the 2nd plant. I feel like it developed the yellow spot after I put it into a stronger light. I've attached photos of the yellow spot and the backside of the leaf. Does this look like sunburn?
Attachment 148828
Attachment 148829
Attachment 148830

Both plants seem to be doing fairly well. The 2nd has a spike and it has grown several inches since being with me.

Please give me your opinion of what these yellow spots mean? Thank you very much!

estación seca 11-17-2020 11:01 PM

I think both are physical damage from scraping. There might have been spider mites. Phals are low light plants. They grow and flower better under low light, 800-1000 footcandles.

Dollythehun 11-18-2020 07:18 AM

I agree w ES. But another member taught me to draw a circle around the questioned area with a sharpie. That way you can see if it expands. I only see one leaf I might do that to. That would be the bottom three pictures.

nuriko1set 11-18-2020 04:23 PM

Quote:

Originally Posted by Dollythehun (Post 942561)
I agree w ES. But another member taught me to draw a circle around the questioned area with a sharpie. That way you can see if it expands. I only see one leaf I might do that to. That would be the bottom three pictures.

Thank you Dollythehun! That's a good idea, ill draw a circle. I don't think its expanded any, but hard to tell!

nuriko1set 11-18-2020 04:39 PM

3 Attachment(s)
Quote:

Originally Posted by estación seca (Post 942533)
I think both are physical damage from scraping. There might have been spider mites. Phals are low light plants. They grow and flower better under low light, 800-1000 footcandles.

Thank you for your several input Estacion, also for my other questions! I'll just deep the phals under the less intense light.

Should I spray the plants again with neem oil? Its been almost 3 weeks since my first spray with need oil. Will it do it harm? I also want to spray needm oil on another orchid that is new that looks like its got some webs on there, is that advisable?

Also, I want to move them to the same room and spot as my other orchids. But because I was afraid of the spider mite issue, I've put it off. What made you feel it had Spider mite? Is it because I suspected or because you see signs? I'm not really experienced enough and I really can't tell, so I usually error on the side of caution, hence some of other mistakes. Here are 2 close up i took of this small thing i found on the leaf. Does this look like a dead spider mite? Do you think i should move them to the main set up?
Attachment 148836

Attachment 148837

Also, for the yellowing in the crease that also has some black colors. Will it do harm if I put some cinnamon powder on it?
Attachment 148838

Thank you very much!!


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