See:
Greenhouse Plants, Ornamental - Gray Mold
Notes: Very few samples of this plant have been sent to the OSU Plant Clinic and none were diagnosed with Botrytis.
Chemical control Best when used on hoya along with cultural controls. Tank-mix and/or alternate products from different groups with different modes of action to prevent the buildup of resistant fungi.
- Astun at 10 to 17 fl oz/100 gal water. Group 7 fungicide. 12-hr reentry.
- Chipco 26019 FLO at 1 to 2.5 quarts /100 gal water. Group 2 fungicide. 12-hr reentry.
- Terraguard SC at 4 to 8 fl oz/100 gal water. Group 3 fungicide. 12-hr reentry.