Yellow spots on dumb cane

Question

Was given a dumb cane and everything was going fine until I noticed small yellow spots all over the leaves. Tried spraying neem oil a couple of times over the past couple of weeks. It has infected the new shoot. What should I do? It’s placed very near a window that’s usually left ajar to let some wind in.  And it can get pretty windy sometimes. Could that be a contributing factor?

@AmberMallow · Answer

When I had a dumb cane, I found it to be incredibly sensitive to temperature and humidity. It might be good to put it somewhere away from the drafty window

@AmberMallow · Answer

I have a book on houseplants with a page for diffenbachia. Idk if Greg's gonna let me share the picture tho

@AmberMallow · Answer

Anyway, it says yellowing lower leaves, as well as dropping leave is caused by low temperature or drafts. Pale leaves might happen if it gets too much bright/direct sun. They want 60-75F/15-24C temperature and higher humidity

@AmberMallow · Answer

Another book I have says diffenbachia grow well in north and east facing windows

@AmberMallow · Answer

@Desiree23 haha, ok. the window facing recommendations are generalizations, so I guess ignore that. Based on my own experience and the two books I have, I think your best bet is to get it out of any drafts. If it's still unhappy, it might be worthwhile to get a thermometer and hygrometer and see what the temperature and humidity are doing

@AmberMallow · Answer

It occured to me it may also be spider mites? I've never had to treat a plant for spider mites, but that seems worth investigating

Yellow spots on dumb cane

Got plant questions?