+ Pyraclostrobin (Insignia 8-16 oz/100 gal). Week 7: Mancozeb (Dithane 75DF Rainshield 1.5 lb/100 gal). Week 5: Chlorothalonil (Daconil Weather Stik, 1.4 pt/100 gal). Week 3: Mancozeb (Dithane 75DF Rainshield 1.5 lb/100 gal) + Tebuconazole (Torque 10 fl oz/100 gal). Week 1: Chlorothalonil (Daconil Weather Stik, 1.4 pt/100 gal). In practice, a rotational schedule of very effective fungicides containing both protectants and systemic products that would have minimal chance of developing resistance might look something like this: We feel these can be blended into an effective season-long program, but this list is not meant to exclude similarly labeled formulations and other effective products. The above list is provided as recommended examples. Spectro 90WDG (1.5 lb/100 gal) is a combination product that contains both chlorothalonil and thiophanate-methyl. Because the systemic classes of fungicides tend to be at risk for development of resistance, it is generally recommended (and often specified on the label) that they should be alternated and tank-mixed with broad-spectrum protectant fungicides such as chlorothalonil or mancozeb. Recommended examples, also listed in the PMG, include fludioxonil (Medallion WDG2-4 oz/100 gal), thiophanate-methyl (Cleary 3336 WP 1.5 lb/100 gal), boscalid + pyraclostrobin (Pageant 12-18 oz/100 gal), and tebuconazole (Torque 10 fl oz/100 gal). Some fungicides are locally systemic (within the leaf) and offer specific modes of action. Examples of protectant fungicides listed in the Virginia Tech Nursery crops Pest Management Guide (PMG, page 5-7) are chlorothalonil (Daconil Weather Stik, 1.4 pt/100 gal) and mancozeb (Dithane 75DF Rainshield 1.5 lb/100 gal). They protect boxwood and reduce the spread of blight by preventing germination and infection by the fungal spores. Keith Yoder - Retired Plant Pathologist, Virginia Techįollowing the severe boxwood blight year in the Mid-Atlantic region in 2018, nursery growers and landscape care professionals should diligently follow prescribed Best Management Practices (BMPs) as a first line of defense to avoid introducing the boxwood blight fungus or, where blight is already present, to manage it most effectively while reducing the risk of spreading it to new locations.įungicides are an essential part of the BMPs.
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