Needlecast diseases require sprays in mid-May and mid-June and do not  respond to common fungicides like Clearys 3336 and Bannermaxx. The Spruce / Anastasiia Tretiak Spray the plant completely, reaching both the upper and lower leaves, and let the plant dry. Has your spruce been diagnosed? As a result some chlorothalonil-based fungicides are listed as phytotoxic to spruce trees. 2. Blue spruce trees are much more susceptible to the disease than white spruce, but we’re seeing heavily impacted white spruce this year too. Those companies seem to suggest that spraying can cure all problems. Scab on crabapple trees is also treatable. 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. Ask an Expert is made up of groups and individual experts. The technique, timing, and type of spray depends on exactly what is being treated. If the fungus … The agent or the supplier of the sprayer may also be of help. In many cases, this damage is worse than the damage of the pest being treated. Always follow the pesticide label directions attached to the pesticide container you are using. A lot of time and money has been wasted by applying fungicides at the wrong time. Spraying too early or too late will miss the stages when the tree can be protected from infection by the fungus. The second application should occur three to four weeks after the first application. Also read about Spectro 90 copper based fungus control. Treatable diseases require a series of specific fungicide sprays applied with very good technique and with fungicides labelled for the problem at hand. How to Use Copper Fungicide. Many "spray sellers" apply fungicide by adding it to a cover spray along with insecticide. 1. General cover sprays of pesticide mixes are never a good idea. Sorry I cannot help more. A reputable spray company will inform the consumer if the treatment window has passed, as it often has when homeowners call. It calls for 5.5 oz per acre- so a tree here and a tree there, what? Oils can damage surfaces of houses, lawn furniture, vehicles, swing sets, etc. Oils work by "smothering" the insects or mites. Similarities and differences between the two diseases exist. We are often asked about dormant oil sprays. 4. Several diseases of trees are treatable with sprays. We abandoned the use of oil sprays many years ago for a number of reasons: 1. It is important to know what you are treating. We have found that we can achieve excellent control of soft scale insects on very large trees with trunk injection of insecticides. 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. The adverse effects would likely outweigh any potential beneficial effects. Most fungal diseases in Michigan require an early spray in April, followed by two or more additional sprays. In order for this to happen, a continuous layer of oil must be applied to all the plant tissues and must persist for long enough to kill the pest. You will find the application directions on the label of the chemical. Close examination of those needles will show rows of tiny black dots (you may need a hand lens to see these), which are the fungal fruiting structures that produce the spores of the fungus. Needle cast diseases can be effectively controlled with fungicides containing chlorothalonil. Our experience has been that even with good equipment and good technique, control has been limited and disappointing to us and our customers. Unfortunately there are many companies that "sell spray" and do spraying indiscriminately. 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. TriCity Tree Doctor  Call us at 989-454-0227, United Tree Service  Call us at 810-266-4363. Many "spray sellers" apply fungicide by adding it to a cover spray along with insecticide. In many cases it is the wrong fungicide and is applied at the wrong time, usually too late in the spring. Repeat the application as necessary to control the fungal problem. The first application should occur when the new needles are half elongated (50% elongation relative to previous years’ needle length). It is important to know what you are treating. Blue spruce Rhizosphaera needlecast will respond to Daconil (chlorothalonil) or copper fungicides and Pine Dothistroma needlecast requires copper fungicides (Junction, Kocide, Cupro). A lot of time and money has been wasted by applying fungicides at the wrong time. SPRAYING TREES FOR PESTS AND DISEASES. The timing of the two applications is the same for the second and third year. Rhizosphaera needle cast (Rhizosphaera kalkhoffii) is a foliar disease of spruce trees. ... Blue spruce Rhizosphaera needlecast will respond to Daconil (chlorothalonil) or copper fungicides … Is there a chemical that can be placed on the ground to be absorbed by the tree? The life cycle of most pests and diseases give only a small window of opportunity for spray control  Spraying at other times is not effective and could actually worsen the problem (see Cottony Maple Scale on scale treatment page). 3. If possible, spray plants when you’ll have at least 12 hours of dry weather following application. The first application should occur when the new needles are half elongated (50% elongation relative to previous years’ needle length). Chlorothalonil based fungicides may discolor spruce needles. Two needle cast diseases occur in North Dakota: Rhizosphaera needle cast and Stigmina needle cast. Spraying is a useful way to treat many pests and diseases. 2. The timing should be right. For Rhizosphaera needle cast, two properly-timed applications per year for at least two consecutive years, and sometimes three years, is required for control. There are some pests and diseases that require a series of sprays for control. In many cases it is the wrong fungicide and is applied at the wrong time, usually too late in the spring. Many thanks, Minnehaha County The amount to use and rate of application should be on the label. You will find the application directions on the label of the chemical. The most common disease of blue spruce is Rhizosphaera needle cast, a fungal disease that usually requires fungicides for management when it occurs. The link above has some spruce diseases that chlorothalonil is used to treat. There is long term control, no adverse effects on beneficial insects, and no environmental toxicity. Crabapple scab and Tip blight on pines must have a spray as buds are opening. As a result some chlorothalonil-based fungicides are listed as phytotoxic to spruce trees. A lot of time and money has been wasted by applying fungicides at the wrong time. How many oz's of mix does a person apply to a tree? 3. Susceptibility varies widely among species, but generally trees … piceae), is the most prevalent and destructive fungal disease of Norway and Colorado blue spruce.Occasionally, Cytospora canker is found on Douglas-fir, hemlock, and larch. Fungicides do not cure needles already infected, but they protect the newest growth as it emerges. It is virtually impossible to get adequate coverage of large trees for oils to work, even with excellent equipment and experienced applicators. We usually say “around Memorial Day”, but actual timing depends on the year, the location, and the individual tree. Spruce trees affected with Cytospora canker fungus, on the other hand, usually have sunken areas along a stem that may ooze resin. The amount to use and rate of application should be on the label. It is critical to read and follow all directions for application and take all safety precautions. A lot of time and money has been wasted by applying fungicides at the wrong time. Many "spray sellers" apply fungicide by adding it to a cover spray along with insecticide. CAUTION: Mention of a pesticide or use of a pesticide label is for educational purposes only. Because the new growth emerges in the spring, the ideal time to spray conifers is coming up soon. In many cases it is the wrong fungicide and is applied at the wrong time, usually too late in the spring. Spraying too early or too late will miss the stages when the tree can be protected from infection by the fungus. For Rhizosphaera needle cast, two properly-timed applications per year for at least two consecutive years, and sometimes three years, is required for control. I do not know the type of sprayer you are using so my information may not be useful. Answer: Thank you for contacting us regarding your tree issues. http://extension.psu.edu/pests/plant-diseases/all-fact-sheets/spruce-diseasesDo you have needle cast disease or another disease? They apply combinations of products in a shotgun, "one size fits all" approach that is not scientifically sound and can cause as many problems as it is intended to treat.