 
This is usually grey mould fungus (Botrytis), entering the flower as it starts to die and spreading into the developing fruits. Remove the flowers when they start to close after pollination this should help to stop the fungus entering the flower. Remove any decaying fruits and spray the compost and plants with Copper Mixture from Vitax.
| 
 Gardening Expert:  | 
If you can't find what you are looking for on the website then you can ask one of our experts. To get in touch with us Click Here
We will try to get back to you with an answer as soon as we can.
Did you find this answer useful? Subscribe to our newsletter for gardeing news, projects, special offers and competitions.
Desert Botanical Garden
Phoenix, Arizona, USA
Shinjuku Gyoen National Garden
Tokyo, Japan
Humble Administrator's Garden
Suzhou, China
Koishikawa Korakuen Gardens
Tokyo, Japan
Keukenhof
Lisse, Netherlands
Medellin Botanical Garden
Medellin, Columbia