It can attack buds, flowers, and leaves, stems and fruit. However, botrytis can be confused with other diseases that cause similar damage. There are more than one species of botrytis and many different strains of each. Botrytis may attack the foliage of nursery stock stored over winter in damp conditions. Botrytis may attack greenhouse crops where humidity is kept on the high side and then condensation forms at night as temperatures cool off.
Free moisture allows botrytis to grow even better.
Cool temperatures may slow the disease down but as long as it is moist the disease continues to infect and spread. Botrytis is active from 32 degrees Fahrenheit to about 80 degrees. Hot dry weather shuts the disease down. Botrytis often lives on dead plant material and from there, spreads into weakened living plant material. It can also infect through wounds or healthy tissue without going though dead or dying tissue.