Botrytis is a fungus disease and is also known as gray mold. It is found where temperatures are cool, rainy in spring and a very mild summer.
Botrytis (left)-University of California, Botrytis on strawberry (right)-Cornell University
It attacks most ornamentals, perennials, annuals, a host of vegetables and fruits. Two other types are specific to tulips (also called tulip fire) and peonies. Avoid overhead watering as this can make the disease spread faster.
How to control Botrytis:
1) Sanitation is the key to the spread of Botrytis. Pick off affected parts and dispose of them. I recommend burning.
2) Organic fungicides specific for Botrytis applied in the early spring is the best prevention.
3) Avoid watering the leaves and be sure to water in the mornings so plants can dry off.
4) Increase air circulation to help plants dry before this disease spreads.