3. A lot of time and money has been wasted by applying fungicides at the wrong time. Adelgids can be treated with systemic, soil injected or drenched insecticides that have very low toxicity and do not damage surfaces or healthy foliage. Spraying too early or too late will miss the stages when the tree can be protected from infection by the fungus. The amount to use and rate of application should be on the label. Timing of treatment for Stigmina needle cast is similar, except preliminary data suggest that the trees should be treated indefinitely, with at least two properly timed fungicide applications per year.Proper timing of the fungicide application is critical for effective control. 5. In many cases it is the wrong fungicide and is applied at the wrong time, usually too late in the spring. The optimal conditions for this to happen include a specific temperature range at the time of application, correct humidity conditions and the timing has to be right to contact the pest during a vulnerable stage of its life cycle. Dormant oil sprays are promoted as a less toxic alternative to the use of insecticides and miticides. Answer: Thank you for contacting us regarding your tree issues. The amount to use and rate of application should be on the label. Treatable diseases require a series of specific fungicide sprays applied with very good technique and with fungicides labelled for the problem at hand. We abandoned the use of oil sprays many years ago for a number of reasons: 1. It is critical to read and follow all directions for application and take all safety precautions. General cover sprays of pesticide mixes are never a good idea. If the problem is more cosmetic or nuisance, then an informed decision should be made as to whether spraying is warranted. In many cases it is the wrong fungicide and is applied at the wrong time, usually too late in the spring. Needle cast diseases can be effectively controlled with fungicides containing chlorothalonil. TriCity Tree Doctor  Call us at 989-454-0227, United Tree Service  Call us at 810-266-4363. The consumer is at their mercy, regarding them as the "experts" and thus trusting the recommendations they give. The classic symptoms of needle cast include brownish purple discoloration and eventual death of older needles, while current-year needles show no symptoms (Figure 1). In many cases it is the wrong fungicide and is applied at the wrong time, usually too late in the spring. Needlecast diseases require sprays in mid-May and mid-June and do not  respond to common fungicides like Clearys 3336 and Bannermaxx. Several diseases of trees are treatable with sprays. Spraying too early or too late will miss the stages when the tree can be protected from infection by the fungus. Our experience has been that even with good equipment and good technique, control has been limited and disappointing to us and our customers. Ask an Expert is made up of groups and individual experts. The Spruce / Anastasiia Tretiak Spray the plant completely, reaching both the upper and lower leaves, and let the plant dry. It is critical to read and follow all directions for application and take all safety precautions. 3. Most of the leaf fungi (anthracnose, leaf spots and leaf blotches)  require no treatment at all. It calls for 5.5 oz per acre- so a tree here and a tree there, what? The first application should occur when the new needles are half elongated (50% elongation relative to previous years’ needle length). I do not know the type of sprayer you are using so my information may not be useful. Unfortunately, many "spray sellers" do not even know the life cycle of common pests and are not motivated to tell the consumer that sprays are not needed or would not be beneficial. Needle cast diseases can be effectively controlled with fungicides containing chlorothalonil. The link above has some spruce diseases that chlorothalonil is used to treat. Spraying is a useful way to treat many pests and diseases. Two needle cast diseases occur in North Dakota: Rhizosphaera needle cast and Stigmina needle cast. The agent or the supplier of the sprayer may also be of help. If unsure whether a spruce has a needle cast disease or another disease, consider consulting with your local county agent. It is important to know what you are treating. CAUTION: Mention of a pesticide or use of a … We usually say “around Memorial Day”, but actual timing depends on the year, the location, and the individual tree. We usually say “around Memorial Day”, but actual timing depends on the year, the location, and the individual tree. Those companies seem to suggest that spraying can cure all problems. Is there a chemical that can be placed on the ground to be absorbed by the tree? The most common disease of blue spruce is Rhizosphaera needle cast, a fungal disease that usually requires fungicides for management when it occurs. Cytospora canker, caused by the fungus Cytospora kunzei (also known as Valsa kunzei var. Timing of treatment for Stigmina needle cast is similar, except preliminary data suggest that the trees should be treated indefinitely, with at least two properly timed fungicide applications per year. Repeat the application as necessary to control the fungal problem. Spraying should be done only for specific problems, only if the benefits outweigh the negative effects and only using the specific technique and with the timing demanded by the problem at hand. That is akin to a doctor giving a patient pills for several different diseases and instructing them to take the pills regularly just in case the patient is prone to those diseases. Missed or soaking wet. Scab on crabapple trees is also treatable. Blue spruce Rhizosphaera needlecast will respond to Daconil (chlorothalonil) or copper fungicides and Pine Dothistroma needlecast requires copper fungicides (Junction, Kocide, Cupro). Do you have needle cast disease or another disease? For Rhizosphaera needle cast, two properly-timed applications per year for at least two consecutive years, and sometimes three years, is required for control. 2. They are still routinely applied by many companies and can be beneficial in some cases. For further information on Rhizosphaera needle cast, see the NDSU Extension service publication PP-1276, “Spruce … Proper timing of the fungicide application is critical for effective control. If the fungus is on fruit trees or vegetable plants, you can safely continue to spray every seven to 10 days until harvest. If possible, spray plants when you’ll have at least 12 hours of dry weather following application. Another key characteristic of needl… As a result some chlorothalonil-based fungicides are listed as phytotoxic to spruce trees. They may also be effective for some adelgids. The pest or disease must be specifically identified. How many oz's of mix does a person apply to a tree? For further information on Rhizosphaera needle cast, see the NDSU Extension service publication PP-1276, “, http://extension.psu.edu/pests/plant-diseases/all-fact-sheets/spruce-diseases. Most fungal diseases in Michigan require an early spray in April, followed by two or more additional sprays. How to Use Copper Fungicide. Rhizosphaera needle cast (Rhizosphaera kalkhoffii) is a foliar disease of spruce trees. 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