July 4, 2019
July 5, 2019
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If these are outside, then possibly. If they are in window light, then you won't, usually, have to worry about sunbleaching.
This can also be caused by overwatering, or not letting the soil dry out just a touch before watering again. The most common cause of what you are seeing is, exactly, this.
If moving to a less heavily lit spot doesn't help, you will want to look to a fungicide.
This article will help: https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm
I would propagate some new plants. Here is how.
Those are aphids and they suck sap from your plant. You can wipe them off with a wet paper towel or rinse them under water. You can also use insecticidal soap or Neem oil. This article should help:
It will not hurt the plant at all to leave them on. Taking them off, however, will allow the plant to continue to grow leaves and stalks a little faster.
This article will give you more information on the care of these plants: https://www.gardeningknowhow.com/houseplants/dumb-cane/growing-dumbcane-dieffenbachia.htm
The pot is too large for the plant. When the pot is much larger than the plant, it gets too much water, because of the large surface area. I would get a smaller pot and repot in fresh potting soil. Then get on a regular feeding schedule if you aren't on one. Here is general care of dumb cane:
it to reach, and when and where should I prune it back so it will fill out? I’d like to have a lush plant but I’m afraid of where to cut the stem so that it starts to bush out. It’s about 1.5 foot right now but just a stem with a few little leaves.
These will reach about 6 feet before they will want to be pruned. I would look into why the leaves are falling off while it is this small. There could be an underlying issue, and I'm afraid that your photo did not come through, so I can't see it to help you.
This article will help you to care for these plants in the meantime: https://www.gardeningknowhow.com/houseplants/dumb-cane/growing-dumbcane-dieffenbachia.htm