The new shoots are most susceptible to infection from bud break until the needles are fully elongated. Cankers are an excellent clue that the damage is due to tip blight fungus. Keeping trees in good vigor with deep watering during droughts, nutrition with fertilization or compost and wood mulch, and control of insects can improve the vigor of pines and decrease susceptibility to tip blight. During rain and windstorms, these spores will disperse over long distances and conditions for infection will remain favorable during rainy and humid days. Reduce stress with proper watering and nutrition. If, later in the summer, more than 10 percent of the trees have severe shoot blight, consider a spray program again next spring. It kills branches by causing cankers and infects the vascular tissue with blue stain. These black dots will be on the needles, usually under the sheath, as well as on the stems and on the cones’ scales. Studies have also shown that Cambistat can reduce the latent stage of diplodia tip blight. Michigan State University Extension programs and materials are open to all without regard to race, color, national origin, gender, gender identity, religion, age, height, weight, disability, political beliefs, sexual orientation, marital status, family status or veteran status. Applications of Cambistat to improve drought tolerance and tree health. Resin oozes from cankers at the base of new shoots in spring. Diplodia tip … Fungicide options include chlorothalonil plus thiophanate, methyl (Spectro 90), thiophanate-methyl (Cleary’s 3336, Topsin M, T-Methyl, etc. Good hygiene is an easy way to minimize and prevent the disease. The time this happens will vary every spring, depending on weather. Diplodia tip blight can attack trees of any age. Any infected plant material needs to be removed so the spores cannot jump to previously healthy tissue. Untreated, repeat infections can spread from needle fascicles to the entire tree branch, and ultimately result in tree death. Diplodia tip blight (formerly known as Sphaeropsis) can kill the current year’s infected needles and stems of Scotch, Austrian pine and in some years we have even found Diplodia on spruce and white fir.The fungal pathogen, Diplodia sapinea, overwinters in pine shoots, bark and cones, and infects growing and elongating shoots in the spring. Pine Tip Blight Control. Check out the MSU Landscape and Nursery Management Certificate Program! For Dothistroma needle blight, spray about mid-May (coincides with the final Diplodia spray) and again about July 1; the first spray protects the previous year's needles and the second spray protects the current year's needles as well. Treatment Strategy. The time this happens will vary every spring, depending on weather. Brown needles at the tip of the current year's growth are the first symptoms. MSU is an affirmative-action, equal-opportunity employer. During wet conditions, spores travel to and penetrate newly emerging needles and quickly cause necrosis. If trees are stressed, resin soaked cankers form on branches and kill them. Branch dieback 3. When symptoms of the diseases have disappeared, … Affected trees should also be mulched lightly and watered (with soaker hoses- to keep branches dry) … The tip blight fungus over winters in debris, which means removal of dropped needles and leaves will limit the tree’s exposure. Diplodia tip blight (Diplodia pinea) can kill the current year’s infected needles and stems of Scots pine (Pinus sylvestris), Austrian pine (Pinus nigra) and in some years we have even found Diplodia on spruce, Douglas fir and white fir. If, later in the summer, more than 10 percent of the trees have severe shoot blight, consider a spray program again next spring. ), and copper hydroxide plus mancozeb (Junction). 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