solani is generally not an issue in the less humid Pacific or inter-mountain regions. solani is problematic in tomato production areas east of the Rocky Mountains and in the midwest, however, A. Early blight can also be caused by Alternaria tomatophila, which is more virulent on stems and leaves of tomato plants than Alternaria solani. Primary methods of controlling this disease include preventing long periods of wetness on leaf surfaces and applying fungicides. If uncontrolled, early blight can cause significant yield reductions. Despite the name "early," foliar symptoms usually occur on older leaves. The pathogen produces distinctive "bullseye" patterned leaf spots and can also cause stem lesions and fruit rot on tomato and tuber blight on potato. 16(12): 1003 (1882)Īlternaria solani is a fungal pathogen that produces a disease in tomato and potato plants called early blight. Jones & Grout, Annual Report of the Vermont Agricultural Experimental Station 9: 86 (1896) For example, some diseases are best treated in fall.Alternaria solani (Ellis & G. Note: Contact your local cooperative extension office to learn specific information on copper fungicide uses in your particular situation. Never mix copper fungicides with other chemicals. Never apply copper fungicide on very hot days. However, it’s best not to spray when bees are actively foraging on plants. Reapply the product every seven to ten days because fungicides degrade after application.įungicides are generally not harmful to bees. However, it’s critical to read the label directions carefully to determine rate of application for each specific product. Typically, fungicides are applied at a rate of 1 to 3 teaspoons per gallon (5-15 ml. If possible, spray plants when you’ll have at least 12 hours of dry weather following application. If the fungus is on fruit trees or vegetable plants, you can safely continue to spray every seven to ten days until harvest. Otherwise, apply the product immediately when you first notice signs of fungal disease. Ideally, apply copper fungicide before fungus is visible. The product works by protecting plants against the development of new infections. When to Use Copper Fungicideĭon’t expect copper fungicide to cure an existing fungal disease. Use copper fungicides sparingly and only as needed. It’s also important to note that copper doesn’t break down in the soil and can become a soil contaminant in time. There are many formulations of copper products on the market, differing widely in the amount of copper, active ingredients, rate of application, and other factors. If you are considering using copper fungicide, be sure to read the label carefully. Since copper is toxic, it can also cause serious damage by killing plant tissues. That said, its effectiveness is limited against late blight of potatoes and tomatoes. What is Copper Fungicide?Ĭopper is a metal that, in dissolved form, penetrates plant tissues and helps control fungal diseases such as: However, fungal diseases are difficult to control, and results aren’t guaranteed. Using copper fungicides is confusing but knowing exactly when to use copper fungicide is the key to success. Copper fungicides are often the first line of defense, especially for gardeners who prefer to avoid chemical fungicides. Fungal diseases can be a real problem for gardeners, especially when the weather is warmer and wetter than usual.
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