botrytis on Rex Begonia
Quick answer
If your Rex Begonia has botrytis, the most likely cause is: Botrytis (grey mould) is a fungal disease encouraged by excessive watering and humidity, and it produces fluffy grey mould on the leaves and stems of rex begonia. The rex begonia thrives in humidity, but stagnant poorly ventilated air around wet compost allows the botrytis fungus to spread quickly across the soft foliage of Begonia rex-cultorum.
Start here:
- 1. Spray the rex begonia with benomyl to suppress the botrytis fungal infection on the leaves and stems.
- 2. Allow the compost to dry out and then resume watering so the surface of the compost dries between waterings, never leaving the pot standing in water.
Why Rex Begonia gets botrytis
Begonia rex-cultorum
Botrytis (grey mould) is a fungal disease encouraged by excessive watering and humidity, and it produces fluffy grey mould on the leaves and stems of rex begonia. The rex begonia thrives in humidity, but stagnant poorly ventilated air around wet compost allows the botrytis fungus to spread quickly across the soft foliage of Begonia rex-cultorum.
How to reverse botrytis on Rex Begonia
- 1
Spray the rex begonia with benomyl to suppress the botrytis fungal infection on the leaves and stems.
- 2
Allow the compost to dry out and then resume watering so the surface of the compost dries between waterings, never leaving the pot standing in water.
- 3
Move the rex begonia to a more airy spot with better ventilation so the humid air around the foliage is no longer stagnant and the grey mould cannot spread.
Keep botrytis off this Rex Begonia
Water the rex begonia only when the surface of the compost is dry and allow the compost to dry out between waterings, keep the plant in a well-ventilated spot, and avoid stagnant humid air around the wet compost so the botrytis fungus cannot take hold on the leaves and stems.