Grey Mold On Begonias - Knowledgebase Question

McHenry, IL
Avatar for doggroom
Question by doggroom
January 18, 1998
I salvaged about 3 dozen tuberous begonias last fall. They have been growing in my basement under lights without a lot of trouble. All of a sudden around Christmas, grey mold appeared. I isolated the bad ones, sprayed a fungicide. I've even put down a fan. What can I do before they are all covered with the mold? I'm picking off the infected leaves now because the majority of the begonias are involved.

Answer from NGA
January 18, 1998
You are off to a good start! Grey mold likes dark,humid, cool areas with low air circulation. The fan was a very good idea, as is picking off the leaves. Try to prevent it from sticking around by continuing use of the fan (without placing the plant in a drafty area), reducing watering, cease misting and, if possible, moving them to a warmer spot. Was the fungicide at all effective? If you feel that it was, continue applications being careful to follow label directions.
Actually, tuberous begonias prefer a little down time in the winter. Ideally, you should lift the tubers out of the soil after the tops begin to yellow, allow them to dry for a few days, and then store them in dry peat moss for the winter. You can get them off to an early start in pots of moistened medium in a warm spot (bottom heat is best). I'm not sure how yours will perform when transplanted to the garden in spring, but I advise storing dormant tubers next winter.

You must be signed in before you can post questions or answers. Click here to join!

« Return to the Garden Knowledgebase Homepage

Member Login:

( No account? Join now! )

Today's site banner is by mcash70 and is called "Hybrid nemesia"

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.