Dead weeds can support Botrytis. Cull piles of strawberries should be covered with several inches of soil, or the berries should be crushed so they dry up and become a less fit medium for Botrytis growth. Since wet plant surfaces are necessary for the germination of Botrytis spores, keep overhead watering to a minimum. Also time your sprinkling, so plant surfaces dry quickly when sprinklers are shut off. This is especially true in seed crops after bloom is initiated.
Drip irrigation is recommended to keep humidities in the crop canopy as low as possible.
Any practice which promotes air movement and the drying of plant surfaces will help reduce Botrytis. Finally, there are a number of fungicides which have activity against Botrytis cinerea. Benomyl, captan, chlorothalonil, dicloran, iprodione, maneb, mancozeb, thiophanate-methyl, vinclozolin, and zineb all show efficacy against Botrytis. Some B. cinerea strains have shown resistance to benomyl and thiophante-methyl. Crops and registered uses vary from label to label.