Dragon fruit, sunburn or fungus?


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Hello all,

this is my first post on the forum so Aloha! I have just transplanted a few new dragon fruit cuttings a few days ago and today I noticed that some of them are turning slightly white. I rubbed the white part of the plant and some of this mystery white powdery stuff actually came off! I don’t know if this is a fungus like a powdery mildew, or if this is a natural response the plant has to increase sunlight, or if this is the early stages of sunburn. Any advice would be greatly appreciated! Thank you!
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Thanks @Logan I appreciate the feedback

I initially thought powdery mildew as well but I only water my DF twice a week. In addition to that I noticed that a small part of my DF has a shadow casted on it from the tie I used to secure it. The area where the shadow is casted on the plant did not produce this white substance.
61FEB8FE-6DB7-41F1-B45D-DF386563FD80.jpeg

My current plan is to expose it to less sunlight and if it still gets worse then treat it with a fungicide.

Powdery mildew is still on the table. Here in Hawai’i the rainy season is starting up and humidity is increasing. I’ll keep the thread updated!
 
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Quick update: after a few days under a shade cloth and even a treatment of fungicide, the problem area has gotten slightly worse. I believe part of the stem is rotting because it has gotten soft and squishy.
D22D8DC9-B5BF-494F-B366-7E6EEDC41FB2.jpeg

im still debating if I should let it heal on it’s own or if I should try to cut out the problem area. Any advice would be appreciated!
 
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