I apply this every one-two weeks from early June to August on all my two needle pines and haven't seen any adverse affects. I've got a JBP that's got a bad case of Needle Cast, and I've sprayed it but I'm concerned that in my enthusiasm to get rid of the cast I may be going overboard with the fungicide. I don't know about copper base fungicides since I use Daconil that contains Chlorothalonil as the active ingredient to prevent needle cast. You are using an out of date browser. I noticed a HUGE improvement. For effective control, infected trees should be treated once in mid-May and … … JavaScript is disabled. A copper fungicide spray is one method that can be applied to prevent needle cast. Apply treatments every three to four weeks starting as new needles emerge in the spring. Blue spruce in Michigan suffers from a serious needle casting disease caused by the fungus Rhizosphaera. I had my first bout with needlecast on both my JBP's this year. The first application should occur when the new needles are half elongated (50% elongation relative to previous years needle length). Well-timed sprays in the spring will normally suppress Rhizosphaera to non-detectable levels in the population of trees. Do systemic fungicides harm black pine mycorrhizae. The casting needles turn purple or brown, die and drop off the stems (Photo … Needle cast diseases can be effectively controlled with fungicides containing chlorothalonil. Trees can be protected from Rhizosphaera needle cast with properly timed fungicide applications. These "fruiting structures" may be black, orange-red, or tan, depending upon the fungus. For fungicide treatments … Consider treating affected trees with fungicides containing the active ingredient copper (e.g., Bordeaux mixture) or chlorothalonil. Trees stressed from drought, poor planting practices or other factors are more likely to suffer from Rhizosphaera needle cast. Growth of the fungal pathogen from the spots on the needle will cause the death of the entire needle. Good info above, add in Orthenex I think, check for Waltr's ingrediants. Make sure to check with local and government requirements for … It got quite advance before I cought it. Treatments will not cure existing infections, but can prevent additional infections. How do I save a tree or shrub with Rhizosphaera needle cast? The most common disease of blue spruce is Rhizosphaera needle cast, a fungal disease that usually requires fungicides for management when it occurs. For Rhizosphaera needle cast, two properly-timed applications per year for at least two consecutive years, and sometimes three years, is required for control. Finding a fungal fruiting structure on a dead needle is not proof that the tree has a needlecast disease. Daconil is a name brand but there are other makes with the same active ingredient. Continue applications through periods of wet weather. I don't know about copper base fungicides since I use Daconil that contains Chlorothalonil as the active ingredient to prevent needle cast. These fungicides can also be used to treat pine blight. For a better experience, please enable JavaScript in your browser before proceeding. Other fungi that grow on dead or dying needles but do not cause needlecast may form similar structures. However, in some plantations needle casting symptoms still occur after sprays (Photos 1 and 2). The symptoms of needle cast first appear on needles as light green to yellow spots, which eventually turn red or brown. This shedding of needles can be more serious to conifers than losing leaves is to deciduous You must log in or register to reply here. Fungicides, what do you use, for what, when and how often? 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. All the needlecast fungi form small structures on the infected needle in which thousands of spores form. Ryan, I get Daconil at the local garden center. Other fungicides that can be used are chlorothalonil and mancozeb. … Rhizosphaera needle cast is a fungal disease of spruce trees that causes needles to turn brown and fall off. They are now growing like they should and a deep rich green. I use Draconil by the directions for pines every 3 weeks during the damp season. Quick facts. We usually say around Memorial Day, but actual timing depends on the year, the location, and the individual tree. Is it possible to use too much fungicide (copper base), and actually hurt a JBP. It may not display this or other websites correctly. Needle cast is a broad group of fungal diseases that cause conifers to shed needles. I apply this every one-two weeks from early June to August on all my two needle pines and haven't seen any adverse affects. The s…