29 Nov spraying fungicide on spruce trees
The link above has some spruce diseases that chlorothalonil is used to treat. A lot of time and money has been wasted by applying fungicides at the wrong time. 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. Go to the supplier of the sprayer for more complete directions of use. Answer: Thank you for contacting us regarding your tree issues. Do you have needle cast disease or another disease? Mites can be treated with specific miticides. The consumer is at their mercy, regarding them as the "experts" and thus trusting the recommendations they give. If possible, spray plants when you’ll have at least 12 hours of dry weather following application. The adverse effects would likely outweigh any potential beneficial effects. Several diseases of trees are treatable with sprays. 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. Another key characteristic of needl… You will find the application directions on the label of the chemical. Has your spruce been diagnosed? Treatable diseases require a series of specific fungicide sprays applied with very good technique and with fungicides labelled for the problem at hand. The first application should occur when the new needles are half elongated (50% elongation relative to previous years’ needle length). 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. 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. There is long term control, no adverse effects on beneficial insects, and no environmental toxicity. Many "spray sellers" apply fungicide by adding it to a cover spray along with insecticide. 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. Spruce trees affected with Cytospora canker fungus, on the other hand, usually have sunken areas along a stem that may ooze resin. Symptoms of both needle cast diseases look similar to each other. CAUTION: Mention of a pesticide or use of a pesticide label is for educational purposes only. Sorry I cannot help more. When that is the case, timing is critical for each application in the series. As you inspect the tree… Oils can cause damage to some evergreens and some tissues and young foliage on deciduous trees. 2. Ask an Expert is made up of groups and individual experts. It is important to know what you are treating. The timing of the two applications is the same for the second and third year. The "spray sellers" often say that theirs is a "preventive" approach, suggesting that applying an insecticide and a fungicide and maybe a miticide several times will prevent any problems that could arise. 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. There are some pests and diseases that require a series of sprays for control. Many "spray sellers" apply fungicide by adding it to a cover spray along with insecticide. Repeat the application as necessary to control the fungal problem. The agent or the supplier of the sprayer may also be of help. It is important to know what you are treating. The second application should occur three to four weeks after the first application. If the fungus is on fruit trees or vegetable plants, you can safely continue to spray every seven to 10 days until harvest. Most of the leaf fungi (anthracnose, leaf spots and leaf blotches) require no treatment at all.