While fungicides are loosely grouped into two categories-preventive and curative-all are preventative, but not all are curative. Hence, the first course of action with any visible lawn problem-including rings of dead grass slick spots or unsightly yellow, brown, or rusty patches-is to treat it with a fungicide. However, almost all grass-related diseases are caused by pathogenic fungi, meaning fungus that can cause an infestation. With more than 2 million different species of fungi, including all types of mildew, mold, yeast, mushrooms, and smuts, it’s not always possible to pinpoint the exact fungi species causing problems in the lawn. Photo: What to Consider When Choosing the Best Lawn Fungicides BEST BROAD-SPECTRUM: Syngenta Heritage G Fungicide.BEST GRANULAR: Scotts DiseaseEx Lawn Fungicide.
BEST BANG FOR THE BUCK: Spectracide Immunox Multi-Purpose Fungicide.BEST OVERALL: BioAdvanced Fungus Control for Lawns.
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Ahead, learn about the different types of fungicides and find out why the following products are among the best antifungal options for keeping grass healthy and free from imperfections. Many fungicides also work to eradicate fungus on trees, shrubs, and ornamental plants, although, depending on the formulation, some may injure specific types of plants or trees. Some products are formulated to stop an active fungal infestation, while others may be preventive to keep a healthy lawn looking great. Today’s best lawn fungicide options are made with biocidal chemical compounds or biological organisms that kill parasitic fungi and/or their spores for the most part, they will not affect weeds or desirable plants (though there are exceptions). Other potential causes include overfertilizing, overwatering, growing turfgrass that’s poorly suited to the area, or mowing the grass too short. Certain situations, such as living in a humid region or experiencing a rainy season, can increase the risk of a fungal infestation in a lawn. Fungi and their spores occur naturally outdoors and are found virtually everywhere, but they rarely wreak havoc with lawns unless they start reproducing rapidly.
Even the best-tended lawn can develop a fungal problem, which can show up as visible brown patches, rusty-looking or yellow spots, rings of dead grass, and slimy areas.
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