These turn white and have a brown border.
Leaves die as do entire plants if stems are girdled.
Colletotrichum antirrhini Heat and ventilate to maintain low humidity. Water in a manner that keeps foliage surfaces dry. Apply azoxystrobin, mancozeb, or ziram to protect healthy plants. Botrytis Blight Petals turn brown and are covered with gray, fungal growth. Botrytis cinerea Space plants to insure good air circulation.