Dendrobium Nobile yellowing leaves
 

I've had this Nobile for a few years now and it was doing really well until it got knocked off the windowsill. It's since had spider mites which are now gone, and scale at the same time (also gone). I've been spraying it with Pyrethrum and it's killed the pests. While the plant has now slowed down yellowing the tips of its leaves, they're still yellowing as this new cane just began yellowing its lowest leaf. Every cane has lost its leaf from the bottom up, tip to base. This is normal I know for years old growth, but these growths are 6 months old. Some growth literally lost its leaves before it matured.

I don't know if it's just stress because I've sprayed the plant every other day, paired with extreme low light due to quarantining it.

Luckily at least this wasn't with the bulk of my orchids, and instead lives next to noid phal, so nothing else is contaminated.

I am also sure I've eradicated all the mites. I've been wiping multiple leaves daily and checking it with a magnifying glass so I know there is no more mites or scale.

It still looks ok.
Nobiles are water guzzlers. I've hardly been able to keep up myself this year.
If they go dry a little too long then they drop their leaves but the canes are still plump and should still be able to flower in spring.
Don't overwater now, the summer is practically over, the only reason my nobiles don't completely dry out is because I grow them in self watering pots and even then they were the only orchids this year that managed to drain their reservoirs completely a couple times and developed some yellow leaves as a result.
To me yours looks just fine still. It could have done with maybe a bit less drying out on the hottest days but not much to worry about imo.

Thanks Shade. I've been thinking of converting to semi hydro and it still has active root tips. I just need a heavy enough pot so it doesn't fall over!

I wouldn't repot until it begins making new growth. They have strong seasonal growth patterns, and tend to make new growth in spring. If you spray the entire plant surface with water weekly you can control spider mites.