12-hr reentry. Copper’s an OMRI-listed organic fungicide. 4-hr reentry. Keeping your plants healthy will help minimize damage, but sometimes you need the aid of a fungicide. That worked alright, but the fungus came back. 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. Fungal diseases can be a real problem for gardeners, especially when the weather is warmer and wetter than usual. Using it appropriately is important. Compass 50 WDG at 1 to 2 oz/100 gal water. So I will try to keep it updated for you. There are different types of fungicide to deal with different forms of fungus. 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 7 + 11 fungicide. Organic Fungicide Treatments. 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. 11/3/2020 – I wrote this post over ten years ago, but it still remains popular. It is less effective as a cure once the fungus has taken hold. “The biggest problem I encountered was with the Phlox I planted,” Dan wrote. Copper fungicides are often the first line of defense, especially for gardeners who prefer to avoid chemical fungicides. Group 3 fungicide. Eagle 20 EW at 6 to 12 fl oz/100 gal water. Cooperative Extension Horticulture Agents listserv, there was a discussion about homemade fungicides and whether extension agents should recommend them or not. There are mold fungicides and lawn fungicide and one can’t be substituted for the other. Group 11 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. 24-hr reentry. When I first spotted it, I did some research and decided to use an organic fungicide. That doesn’t mean its safe for all situations. Do not use organosilicate additives. 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. A study found that “a one percent neem oil treatment was effective in managing powdery mildew on hydrangeas, lilacs and phlox. Water. 12-hr reentry. They can’t cure the problems. “The leaves developed a terrible fungus and it slowed its growth terribly. Using copper fungicides is confusing, but knowing exactly when to use copper fungicide is the key to success. 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