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  #1  
Old 11-05-2022, 02:25 AM
NKYorchid NKYorchid is offline
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Oncidium Leaf Tip Burn
Question Oncidium Leaf Tip Burn

My Oncidium Tsiku Marguerite has been doing well currently with multiple spikes. Noticed dead leaf tips and an increased number of black spots. Wonder if this is classic in appearance for a diagnosis or within normal limits.

Location: Midwest
Medium: RepotMe bark topped with sphagnum
Light and climate: North-facing windowsill all spring and summer into fall. Moved under lights a week ago - RH average 57%. 24Watt LED receiving ~100 PPFD.
Water: 1-2/week. Tap water (PH 7.3, Ca 30mg/L, ?Mag)
Fertilizer: Miracle Grow Orchid 30-10-10 about every other watering. 1/8 teaspoon into a 1/2 gallon watering can

Considerations:
1. Salt build-up resulting in fertilizer toxicity.
2. Dry climate, possible dehydration (I shriveled the pseudobulbs in late summer a few times)
3. Nutrient deficiency
4. Sunburn (probably unlikely)

Would appreciate any thoughts!

Oncidium Orchid - Album on Imgur

Last edited by NKYorchid; 11-05-2022 at 02:29 AM..
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  #2  
Old 11-05-2022, 02:35 AM
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Temperatures? My experience has been this one doesn't like high temperatures.
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  #3  
Old 11-05-2022, 02:41 AM
NKYorchid NKYorchid is offline
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Thanks for the reply. The temperature in the air-conditioned house is in the low 70's to mid 60's.
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  #4  
Old 11-05-2022, 11:29 AM
t_howell t_howell is offline
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Looks like a healthy plant to me. I wouldn’t worry about it. Maybe just a bit of sunburn…
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  #5  
Old 11-05-2022, 01:43 PM
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sweta sweta is offline
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Quote:
Originally Posted by NKYorchid View Post
My Oncidium Tsiku Marguerite has been doing well currently with multiple spikes. Noticed dead leaf tips and an increased number of black spots. Wonder if this is classic in appearance for a diagnosis or within normal limits.

Location: Midwest
Medium: RepotMe bark topped with sphagnum
Light and climate: North-facing windowsill all spring and summer into fall. Moved under lights a week ago - RH average 57%. 24Watt LED receiving ~100 PPFD.
Water: 1-2/week. Tap water (PH 7.3, Ca 30mg/L, ?Mag)
Fertilizer: Miracle Grow Orchid 30-10-10 about every other watering. 1/8 teaspoon into a 1/2 gallon watering can

Considerations:
1. Salt build-up resulting in fertilizer toxicity.
2. Dry climate, possible dehydration (I shriveled the pseudobulbs in late summer a few times)
3. Nutrient deficiency
4. Sunburn (probably unlikely)

Would appreciate any thoughts!

Oncidium Orchid - Album on Imgur
I've recently had similar issue with leaf tip burn on my oncidium twinkle and gold dust and I was using tap water with PH around 7. After I posted on the forum and based on feedback I recieved switched to rain water or RO water and that seemed to help stop the browning leaf tips. Also I havent had good success with using fertilizers like miracle grow and better grow brands. They increase the pH further. I have done pH testing on our tap water.with added better grow 11-35-15 fertilizer and it raised the pH quite a bit. I used.to have discoloration along the.edges of phalaenopsis leaves which stopped after I switched to repot me fertilizer.
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  #6  
Old 11-05-2022, 06:57 PM
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Roberta Roberta is offline
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Looks healthy to me too. Oncidiums do tend to get ugly leaves. One thing that you do have to watch... these need to never dry out. If it is tending to get dry between waterings, water more often. The fertilizer shouldn't be a problem, being very dilute.
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Old 11-05-2022, 07:01 PM
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Quote:
Originally Posted by sweta View Post
I have done pH testing on our tap water.with added better grow 11-35-15 fertilizer and it raised the pH quite a bit.
Raised, made more alkaline, or lowered, made more acidic?
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  #8  
Old 11-06-2022, 09:39 PM
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Quote:
Originally Posted by estación seca View Post
Raised, made more alkaline, or lowered, made more acidic?
sorry I meant lowered i.e more acidic
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