That worked alright, but the fungus came back. That doesn’t mean its safe for all situations. Organic Fungicide Treatments. Once a determination is made that a fungicide is needed, when to use fungicide on your plants depends on the type of fungus. 12-hr reentry. Types of Fungicide. 4-hr reentry. Heritage at 1 to 4 oz/100 gal water plus a non-silicone-based wetter sticker. Group 11 fungicide. Copper’s a strong fungicide. Cooperative Extension Horticulture Agents listserv, there was a discussion about homemade fungicides and whether extension agents should recommend them or not. “The biggest problem I encountered was with the Phlox I planted,” Dan wrote. Powdery mildew refers to a group of fungal diseases that all show up as a powdery white coating on plants, especially when humidity is high. 12-hr reentry. Do not use organosilicate additives. When I first spotted it, I did some research and decided to use an organic fungicide. ” However, a horticultural oil spray generally works better for powdery mildew control and a bicarbonate solution works even better – see: Baking Soda, a Home Remedy Fungicide – the Cornell Formula. There are mold fungicides and lawn fungicide and one can’t be substituted for the other. 24-hr reentry. 7/6/2010 – Last week on the N.C. If you know a plant is affected by powdery mildew year after year, as is the case with many monarda, phlox, and lilacs, then spraying early in the season may prevent any occurrence that year. By going this route, you also know exactly what types of pests the treatment will kill and which types of plants it’s most helpful for. Group 3 fungicide. Copper fungicides are often the first line of defense, especially for gardeners who prefer to avoid chemical fungicides. It usually doesn't kill plants, but it can weaken them and lead to poor growth and yield. So I will try to keep it updated for you. Group 11 fungicide. When you can, you should always try to avoid getting fungus in the first place so you don’t have to turn to the big guns. A study found that “a one percent neem oil treatment was effective in managing powdery mildew on hydrangeas, lilacs and phlox. They can’t cure the problems. Eagle 20 EW at 6 to 12 fl oz/100 gal water. Water. Tips to Prevent Fungus. Compass 50 WDG at 1 to 2 oz/100 gal water. If you don’t want a do-it-yourself solution, there is a variety of commercial treatment options that are just as environmentally friendly and approved for organic gardening. “The leaves developed a terrible fungus and it slowed its growth terribly. Copper’s an OMRI-listed organic fungicide. Group 7 + 11 fungicide. 11/3/2020 – I wrote this post over ten years ago, but it still remains popular. Using copper fungicides is confusing, but knowing exactly when to use copper fungicide is the key to success. 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