![]() You can also download the actual labels as a PDF, which I find infinitely easier to read than the fine print on the bottle. If you search online, all of the chemicals will have a bulletin available which goes through all the specific details of what it affects and how. Others may drift in the wind while you spray, getting in eyes or lungs. Many chemicals can be absorbed directly through your skin. Certain chemicals are only approved for commercial applications, but are not regulated by sale to you. Some chemicals are safe when applied in certain ways, and not safe by other means. However, if we deviate from the specs, things can change dramatically. Many of the chemicals listed will affect humans in some way, but in the doses and exposures we receive while handling them in the specified manner, they have been deemed to be insignificant. Be sure to check out any chemical you plan to use thoroughly. Just like the medical profession, our first objective should be to do no harm, to either tree or self. If I do, it’s for your benefit, to remind you of safe practices, both for you and your plants. But first, we need to go over some of the fundamentals.įorgive me if I repeat some things as we go through the series. 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. Also, clean-up of any infected needles and branches will help reduce the spread of the disease.I knew that when I started this series that it was going to be a daunting task, and it is proving me right. Heavily infected trees may require several years of fungicide applications but should be sprayed, soil drenches are not effective. For Rhizosphaera needle cast, two properly-timed applications per year for at least two consecutive years, and sometimes three years, is required for control. Needle cast diseases can be effectively controlled with fungicides containing chlorothalonil. For best effectiveness, fungicides should be applied when the emerging needles are half elongated (1/2 to 2 inches in length). Protecting new growth as it emerges is very important. ![]() Young trees may be killed by this disease, but usually branches die off after 3-4 consecutive years of defoliation, causing trees to look disfigured.Įarly identification of Rhizosphaera can prevent major damage to individual trees and prevent the spread to nearby trees. It can take up to 15 months for the needles to show visible symptoms after the initial infection. It starts on the inner and lower growth and progresses upward through the tree. It is most common in trees growing outside of their native range. Rhizosphaera needle cast (Rhizosphaera kalkhoffii) is a foliar disease of spruce trees. Is there a chemical that can be placed on the ground to be absorbed by the tree?Īnswer: Thank you for contacting us regarding your tree issues. Also read about Spectro 90 copper based fungus control. I have read about the Needle Cast problem. ![]() Question: I have a blue spruce that is 40-years old and very tall.
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