Dtps. Kenneth Schubert 'Blue Star' with mottled leaf coloration
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  #1  
Old 08-22-2017, 07:26 PM
Biscuit&Gravy Biscuit&Gravy is offline
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Dtps. Kenneth Schubert 'Blue Star' with mottled leaf coloration
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So two 1/2 months ago I purchased a Dtps. Kenneth Schubert 'Blue Star'. It was making a small leaf and wasn't in bloom when it came. The medium it was in was very old and I repotted it right away. It seemed a bit shocked and the leaf stalled growing for a bit. This past month is is going crazy with root growth and the leaf has started to grow pretty fast. However...I noticed these weird small circular spots on the leaf with a dark center. I had no idea what they were so I put alcohol on it and put cinnamon on the spots. I haven't noticed anymore of that for a while but now the leaf has that weird mottled coloration...and just on that new leaf. Any suggestions?

Thanks in advance!
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  #2  
Old 08-23-2017, 02:32 AM
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It looks to me like mechanical damage. It may have scraped something, or a sucking insect may have fed on that spot.

The leaves seem pale green, which isn't quite right for Phals - are you fertilizing? Are you giving magnesium and calcium with your fertilizer? Any chance it's getting too much light?
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Old 08-23-2017, 10:05 AM
Biscuit&Gravy Biscuit&Gravy is offline
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I was wondering the same things too...just going off of google searches so I wasn't sure! I put it in a more indirect sunlight spot. I do fertilize every other week with Grow More which says urea free on the bottle. It's the only one I could find that was urea free but it doesn't have magnesium in it...just manganese. I read about using a tsp. of epsom salts per gallon so maybe I'll try that and see if it helps. My fertilizer doesn't have calcium either though...do you know a good fertilizer for phals that does?

Thanks again for all the advice!!

Last edited by Biscuit&Gravy; 08-23-2017 at 10:18 AM..
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Old 08-24-2017, 02:58 PM
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Orchids take up urea nitrogen just fine. Information to the contrary was debunked long ago.

Manganese and magnesium have no relation except both begin with the letter M.

Plants incorporate one magnesium atom in each molecule of chlorophyll. Lack of magnesium is a possible explanation for why your plant is so pale. Chlorophyll is damaged by sun exposure over time; lack of magnesium prevents plants from forming more. Magnesium deficient plants in too much light become paler and paler.

Plants need a little calcium, too, but not a lot. Plant roots actively exclude most calcium to prevent the plant taking up too much.

Are you diluting your fertilizer with tap water, or pure water? If tap water, look up your water utility's online water quality report. What is the value reported for total dissolved solids (TDS?) Much tap water includes sufficient calcium and magnesium for most plants. I suspect you aren't using tap water, or your tap water is low in calcium and magnesium.

There should be no problem using your fertilizer if you also give your plants magnesium and calcium. It takes quite a while (months) to replete magnesium stores, once depleted. Add a small amount of Epsom salts (1/4 teaspoon per gallon) to all your waterings. Or use a higher amount, less often.

People here report using plaster of Paris mixed into water to supplement calcium. If you use the Search function in the top maroon bar, and search on plaster, you can find these posts.
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Old 08-24-2017, 04:51 PM
Biscuit&Gravy Biscuit&Gravy is offline
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Thank you so much for all the help and great information!! I will give some of your tips a try!!
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