Brown spot on Paph delenatii

[AydenBoi]

Hello everyone,

I m looking for some help of my delenatii.

It has a strange brown spot developed on the leaf about few days ago. And the spot seems like spreading.

I had fertilised the delenatii the day before the spot developed, with around 0.3 ml 2-3.5-2 fertiliser mix with around 350 ml water (a starxxxxx tall size ice coffee cup)

Is it caused by salt or sun burn? should i cut off the brown area?

Thank you very much!!





two days after, the spot looks bigger

[estación seca]

Welcome to the Orchid Board!

What are your temperatures and humidity where the plant grows? How much light is it getting?

I don't know what that is. It almost looks like a liquid dripped on the plant and damaged it. I leave most spots alone for a few days to see whether they remain moist or dry out. If they are moist and spreading I cut the leaf off all the way to the base, and treat only the cut surface with powdered cinnamon.

[AydenBoi]

Thank you estación seca!!

i grow this plant on the southwest windowsill in living room. It receives bright light in the morning and then will pull down the window blind in afternoon to prevent direct sun

Temperature for this few months is around 27°C to 32°C and humidity is around 50%-70%, i will also mist the plant with USB humidifier at night while the air con is on.

i'll try to keep the leaf dry for few days to see what's happen.

[estación seca]

I don't mist orchids. Your humidity is fine. Misting leaves makes them more prone to fungus infection.

Your temperatures are warmer than some people recommend for this plant. I don't know whether that is a problem.

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[Roberta]

Paph delenatii should do fine in those temperatures, with the high humidity especially. It grows warmer than most of the parvisepalum group.