Eagle 20 EW at 6 to 12 fl oz/100 gal water. 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. Fungal diseases can be a real problem for gardeners, especially when the weather is warmer and wetter than usual. Using copper fungicides is confusing, but knowing exactly when to use copper fungicide is the key to success. Group 11 fungicide. 12-hr reentry. Heritage at 1 to 4 oz/100 gal water plus a non-silicone-based wetter sticker. Organic Fungicide Treatments. They can’t cure the problems. Types of Fungicide. Group 7 + 11 fungicide. “The leaves developed a terrible fungus and it slowed its growth terribly. 4-hr reentry. That worked alright, but the fungus came back. Cooperative Extension Horticulture Agents listserv, there was a discussion about homemade fungicides and whether extension agents should recommend them or not. There are different types of fungicide to deal with different forms of fungus. 7/6/2010 – Last week on the N.C. 24-hr reentry. 12-hr reentry. That doesn’t mean its safe for all situations. When I first spotted it, I did some research and decided to use an organic fungicide. Copper’s an OMRI-listed organic fungicide. Water. Do not use organosilicate additives. It usually doesn't kill plants, but it can weaken them and lead to poor growth and yield. “The biggest problem I encountered was with the Phlox I planted,” Dan wrote. ” 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. It is less effective as a cure once the fungus has taken hold. So I will try to keep it updated for you. Compass 50 WDG at 1 to 2 oz/100 gal water. A study found that “a one percent neem oil treatment was effective in managing powdery mildew on hydrangeas, lilacs and phlox. Using it appropriately is important. 11/3/2020 – I wrote this post over ten years ago, but it still remains popular. Copper’s a strong fungicide. 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. Group 3 fungicide. 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. Tips to Prevent Fungus. Keeping your plants healthy will help minimize damage, but sometimes you need the aid of a fungicide. 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. There are mold fungicides and lawn fungicide and one can’t be substituted for the other. Once a determination is made that a fungicide is needed, when to use fungicide on your plants depends on the type of fungus. Copper fungicides are often the first line of defense, especially for gardeners who prefer to avoid chemical fungicides. 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.
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