I started noticing my N. ventricosa declining a few days ago. Upon inspection I found powdery orange/rust colored stuff all over on the bottom of the leaves. At first I thought it was 'rust'. From the descriptions I've read, rust is more in spots than all over. Maybe I misunderstood? What might it be?
Edit: I should also add that on the smaller plant, the leaves are getting much smaller and also have a yellowish hue to them. The larger plant is not yet making the smaller leaves or turning in color, but does have the odd 'rust' colored powder on the bottom of some leaves.