![]() ![]() We are going to cover disease treatments this month, then move on from there. Later on, I will talk about specific pests and diseases, so this subject will drag on for few months. With that in mind, I decided to talk about treatments so that you can have that information in hand. I could make a nice chart, but I don’t have a way to make a three dimensional version. The trick to the whole subject is tackling the relationship between three main factors specific plant species, different pests and diseases that might occur on them, and the myriad of treatments available and their efficacy. ![]() I got some positive feedback on the last article, so we are forging ahead. Other evergreen options include concolor (white) fir, Easter red cedars or other junipers, and yew.ĭiplodia tip blight on an Austrian pine branch.ĭothistroma needle blight on Austrian pine.I knew that when I started this series that it was going to be a daunting task, and it is proving me right. White pines have fewer disease problems than Austrian or Scots pines. Options include Norway spruce or Black Hills spruce. Colorado Blue Spruces are very susceptible to Rhizosphaera needle cast, but other types of spruce are more resistant. Remember that it's not easy or cheap to spray large trees, so it's better to avoid planting disease-prone plants in the first place. For most homeowners, it is more feasible to hire a tree care company to make the application than to do it yourself. Adequate coverage throughout the canopy is important, and this requires high-power spraying equipment. The label will tell you whether a fungicide is labeled for your disease on your tree, application rates, and protective equipment to wear while applying the fungicide. Send a sample in for diagnosis before you decide to spray.įollow label directions exactly. Many factors other than disease can cause browning of needles, and fungicides are no help for these noninfectious problems. ![]() Note that trees that are infected with both diseases require a total of four sprays.ĭon't apply fungicides unless you are certain your tree has a fungal needle disease. Dothistroma needle blight can be managed by spraying once in mid-May and again four to six weeks later. To manage Diplodia tip blight requires three fungicide applications, once when buds begin to swell (late April), again in early May, and again in mid-May. Both can be managed with fungicide sprays, but the timing of application differs for each. Both diseases can progress over the years to make trees very unsightly. Dothistroma needle blight causes spots to appear on the needles, which turn brown above the spots. Diplodia tip blight causes new growth to appear as tufts of stunted, brown needles on the tips of branches. For effective control, infected trees should be treated once in mid-May and again four to six weeks later.Īustrian pines are susceptible to two fungal needle diseases, Diplodia tip blight and Dothistroma needle blight. Rhizosphaera needle cast causes needles to turn purplish brown and fall from the tree, usually from the inside of the tree working out and from the bottom of the tree working up. The most common disease of blue spruce is Rhizosphaera needle cast, a fungal disease that usually requires fungicides for management when it occurs. Because the new growth emerges in the spring, the ideal time to spray conifers is coming up soon. Fungicides do not cure needles already infected, but they protect the newest growth as it emerges. Several fungal needle diseases of conifers require fungicide sprays for satisfactory control. ![]()
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