What Are Brown Spots On The Stem Of My Angel Wing Begonia?

Question

The plant is a cutting. I’ve been growing the cutting for about a year and a half and it is about three feet tall and has produced another plant from the soil. Both are three feet tall with tons of leaves. Beautiful flowers and constant new growth. Just noticed brown spots on the stem but has several new leaves and new flowers coming in currently. What’s wrong with it to cause the spots?

Answer 1

It could be the beginning of botrytis blight, but hopefully not. Here is information about blight and rot to keep you aware. It could be a fungal disease you can treat with Neem oil. Here is more:
https://www.gardeningknowhow.com/ornamental/flowers/begonia/begonia-botrytis-treatment.htm

https://www.gardeningknowhow.com/ornamental/flowers/begonia/what-is-begonia-pythium-rot.htm
https://extension.psu.edu/begonia-diseases
https://www.gardeningknowhow.com/ornamental/flowers/begonia/begonia-botrytis-treatment.htm