Hello all.
I have this Oncidium Golden Mirth "Filini's Gold Dust" that I bought as a plug one year ago. It is growing in semi-hydro and has been in a grow tent for the last 6 months or so. It seems very vigorous, putting out new growths and roots with firm pseudobulbs (started as a single small p-bulb).
I have noticed over the last few months that the leaves seem to be mottling and the tips slowly turning yellow and I would like to know your thoughts on the matter. The mottling is most apparently on the older leaves but also subtly visible on the new ones.
I use rainwater and MSU rainwater formula. I probably had been under fertilizing it over the winter (fed at 50ppm N every week). I have increased the dose recently to 100 ppm every week. It otherwise has been in my grow tent at about 80+% humidity, 3 fans circulating air and 65-78F with grow lights on 9 hours a day. The roots seem healthy although they are covered with algae and probably cyanobacteria (I have tried some Physan20 rinses but it does not seem to go away).
New growth
Roots
The whole plant.
Mottling and yellow tips on oncidium. Disease, nutrition or...?
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