Stands of pine trees should be thinned, leaving healthy, well-spaced trees. Photo credit: Jill O’Donnell, MSU Extension. When dealing with funguses like these it is best to use a systemic and a contact in combination. Some types are also referred to as powdery mildew, downy mildew or sooty mold. Time fungicide applications to protect new growth from bud break through full candle elongation. Copper Fungicide Used to Kill Blue Mold in Evergreen Trees. Fungicide tends to be more effective during this time period. There are no chemical treatments for a tree once it is infected. Diplodia tip blight can attack trees of any age. Dothistroma CAN infect very late in the seaon (sept/oct. Bottom of Scotch pine trees browning in August-September. Grow your own painted daisies and use the flowers as a fungicide for plants. Pyrethrin leaves that come from the painted daisy flower are widely used in commercial fungicide for plants. Horticulturists at Colorado State University recommend preventative spraying of living green trees in the early summer to prevent beetles from attacking a tree. Fungicide products labels contain all the necessary information regarding the active ingredient, mode of action, the direction of use and the specific plant the fungicide work best for. if conditions are right). If the fungus is on fruit trees or vegetable plants, you can safely continue to spray every seven to 10 days until harvest. Blue molds are members of the Penicillium species of fungi. Good management, such as not changing soil levels and covering the roots with fresh soil, can go a long way to keeping your pine trees healthy. Don’t replant pine as a replacement – choose a spruce, fir, or hemlock instead. Apply a fungicide; In the spring, spray a fungicide on the branches just as the buds for new needles start to appear. Brown, stunted new shoots are a common symptom of Diplodia blight on Scots pine. Even though we see the symptoms in the fall, fungicide applications should be timed when the new needles are about half grown (May-June) and a second spray about three weeks later. You must always take time to be sure that you are familiar with all the information … Keep spraying as the new needles grow. I recommend 3336 (16 oz per 100 gal) and Chlorothalonil 720 SFT (22 oz per 100 gal). Pine trees are susceptible to a variety of fungi species, including blight and several types of rust fungi. There are numerous other pine diseases, but they are mostly just unsightly, rather than lethal. Photo credit: Jill O’Donnell, MSU Extension Fungus can become resistant to fungicide. Ideally, apply copper fungicide before fungus is visible. Cooking oils are often mixed into homemade plant fungicide to make them cling to leaves and stems. Otherwise, apply the product immediately when you first notice signs of fungal disease. Remove and destroy infected bark and trees. 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