Sharry baby leaves showing discoloration

[sweta]

Hello friends,

My oncidium sharry baby has developed yellowish patches on the leaves. I've had this for close to 2 years. It never bloomed since I got it but grew a new pseudo bulb and grew new leaves. The yellowish patches are something new I'm seeing it wasnt there before. Could this be due some nutrient deficiency ir could it be some disease? I'm from seattle area and we do not get lot of sunlight so this one has been growing under grow light. Also any tips to get oncidiums to bloom?

[estación seca]

The wrinkles reflect insufficient watering. How are you fertilizing? Photos are small on my phone. This might be spider mite damage. Search here on "spider mite" to read more.