I brought 2 similar plants, of this same Dieffenbachia (see attached photo):
- Both were brought from the same nursery
- Both were brought at the same time
- Both were placed in new (never been used before) plastic pots
- Both were put in the same fresh (never been used before) potting mix
- Both were put in the same room with similar light and water conditions
I've had them for about 10 days now. I've had Dieffenbachias before and I also currently grow other Aroideae plants (Aglaonema, Alocasia, and Philodendron) - all exhibit yellowing of older (or more accurately I'd say lower) leaves, as a part of it's natural growing process.
This time the leaves are yellowing very fast
All yellow leaves in the photo have yellowed in only a few days - usually on other plants I see one leave at a time proportionate to its growing rate
Also - the other plant is, of course, healthy :)
Leaves aren't yellowing regularly
It looks like some kind of fungus or bacteria, as evident by the edges of yellowing leaves
I thought about treating the soil with hydrogen peroxide, but I don't want to "kill" the soil - it's a fresh potting mix.
What do you think?