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Cercospora leaf spot or fruit spot is a fungus that requires moisture and is wind borne. The leaves at the e…. So when you look over your crape myrtle trees here in the mid to late summer period and you see a lot of leaves changing color and the weather has been rainy. (See Table 1, page 6.) Flowers are deep red. Th… Can you tell me what it is, and what can I do to help my tree? A number of new crape myrtle cultivars from the U.S. National Arboretum and other nurserymen are resistant to powdery mildew and Cercospora leaf spot. A related species, Pseudocercospora causes similar spots. Date Photo Taken: 07/27/2013 Location: Social Circle Posted By: mdelmore. Cercospora is a leaf spot fungus that used to be fairly uncommon, but isn't anymore. “The crape myrtle varieties most tolerant to Cercospora leaf spot are Natchez, Muskogee, Basham’s Party Pink, Sioux and Tonto,” Owings says. You have permission to edit this article. Excellent resistance to leaf spot and powdery mildew. Cercospora Leaf Spot. Contact Us; … Selections are rated for disease symptoms at least two times during growing season. OUT DAMN SPOTS: Many crape myrtles are dropping yellow or red leaves with spots on them. I have a Velma's Royal Delight crape myrtle that I planted in 2008. He hosts the “Garden Show” on WWL-AM Saturdays at 9 a.m. Email gardening questions to gnogardening@agcenter.lsu.edu. Locating the plant in full sun and providing good air circulation helps prevent powdery mildew, but the best approach is to choose resistant varieties. It has a lovely watermelon color and resistance to powdery mildew and Cercospora leaf spot. OUT DAMN SPOTS: Many crape myrtles are dropping yellow or red leaves with spots on them. Leaf Spot on Crape Myrtles « Back to Name that Plant. In addition to the spots, symptoms typically include premature defoliation, starting on the lower branches and moving upwards; and bright fall-like discoloration of the foliage. Leaf Spot on Crape Myrtles « Back to Name that Plant. It was released by the U. S. National Arboretum in 1990, and has been recognized as a Georgia Gold Medal winner (1996) and Mississippi Medallion plant (1999). Satisfactory exfoliating bark. It has been very wet this year. Cercospora Leaf SpotThis is a crepe myrtle disease that is caused by fungus it symptoms include yellow spots on the top side of the crepe myrtle tree leaves and a whitish gray coating on the underside. Only when populations are high every year is control really necessary. First, rake up all fallen … It was released by the U. S. National Arboretum in 1990, and has been recognized as a Georgia Gold Medal winner (1996) and Mississippi Medallion plant (1999). You know what's going on but you also know it's too late to spray this ___ to do anything and that the disease overall is not that debilitating to your tree. The crape myrtle varieties most tolerant to Cercospora leaf spot are Natchez, Muskogee, Basham’s Party Pink, Sioux and Tonto. Powdery mildew typically develops in late spring and fall and is associated … Can I fertilize my lawn again this weekend or should I wait? Asked August 5, 2019, 8:50 AM EDT. This leaf spot on crape myrtles can cause severe defoliation during wet periods in the summer. These red, yellow or orange splotches are a reaction to toxins produced by the fungus. It is a very common fungal leaf spot disease of crape myrtles called Cercospora leaf spot. Cercospora Leaf Spot: The tree fungus begins as a small spot on the leaves. It is very likely too soon to add more fertilizer, but you can check the label of the product you used. I have a 3-year-old Meyer lemon tree that seems to have picked up some kind of disease that started a couple of weeks ago. Brown Leaves vs. Brown Spots . Early symptoms of leaf spot. Cercospora Leaf Spot of Ligustrum. I have sprayed twice with Thiophanate methyl (Green Light Systemic Fungicide). Different types of lawn fertilizer are formulated to last different lengths of time. Institute of Food and Agricultural Sciences. Indeed, by the time you see the spots it's really too late to do anything about it. If you apply fertilizer sooner than you should, the fertilizer left over from the first application plus the new fertilizer you apply may be enough to damage the grass. Source: Louisiana State University Press Release. How to care for crape myrtles: Faded flowers and fungus spots are bothering these readers, Are citrus miners attacking your fruit trees? This disease can result in almost complete defoliation of susceptible crape myrtle cultivars during late summer. Find out how to treat this disease. Arkansas Plant Disease Control Products Guide - MP154 -- Kevin. 422, Bureau of Plant Pathology, P. O. After the flower clusters of crape myrtles fade and the flowers drop off, you will see clusters of green balls. For crape myrtles sending out abundant new growth, the weight of the seedpod clusters can make the branches bend down. Dan Gill is a retired consumer horticulture specialist with the LSU AgCenter. What happens is that in mid- to late summer, angular, brown spots form on the oldest leaves. Publication. Infected parts of the plant are usually distorted and stunted. Email notifications are only sent once a day, and only if there are new matching items. The infection causes dark-olive to black-colored spots on the leaves, which then turn red, orange or yellow and fall off. resistant crape myrtle cultivars. Cercospora leaf spot of crape myrtle beginning as tiny flecks on lower surface of 4 uppermost leaves and large irregular, brown spots coalescing and causing distortion of the larger lower leaves on the right. Diseases Symptoms: Round leaf spots (may have purple or dark brown borders), tiny black flecks (fungal spores) in the center of the spots. Flower buds may not open. “This year though, even these varieties are showing some symptoms of the disease.” Long term, this disease is not detrimental to a tree, although it will slow down growth on younger plants, the AgCenter experts say. Mid-summer leaf damage caused by hungry moths, You may wilt in the heat, but your flower beds don't have to if you choose the right plants. Powdery mildew is the most widespread and serious disease in Georgia. So in this situation you cannot make the wrong decision. These purple crapes reach 40 feet tall and more in Texas. Although you will see some symptoms after periods of rainy weather, it is usually moderate. It is most common during spring and fall. Diseased leaves can become twisted or distorted and take on fall colors of yellow and bright red before falling to the ground. The goal of this research was development of crape myrtle germplasm with resistance to Cercospora leaf spot and powdery mildew. Flower performance and growth habit also have been observed. Fortunately, Cercospora leaf spot does not greatly affect the overall health of the trees, and there is no real need to spray fungicides. Powdery mildew is the most widespread and serious disease in Georgia. These condida transfer from rain splash, mechanical transfer, or wind. I fertilized my lawn about three weeks ago with Turf Builder and it looked great. Cercospora leaf spot is a fungal disease that affects crops, ornamental plants, shrubs and flowers. Twilight purple crape myrtle reaches over 40 feet tall. Blame the excessive rains, as rainy weather encourages outbreaks of this disease. Heavily infected flowers may fail to open. -- Christopher Landry. Only when populations are high every year is control really necessary. You can, however, achieve some control of the Cercospora leaf spot fungus with applications of a systemic fungicide in the spring. Most products have a short control period. Like all trees, Crape Myrtles can develop fungus or mildew on their leaves. Pathogen: caused by the fungus Cercospora sp. The traditional crape myrtle (Lagerstroemia indica) is susceptible to both powdery mildew and cercospora leaf spot. This is a fungal disease called Cercospora leaf spot. It does look like you have a leaf spot disease, but they are not usually a great threat to the plant. There was a problem saving your notification. Cercospora Leaf Spot Showing up on Louisiana Crape Myrtles. (A Xanthomonas leaf spot has also been seen on crape myrtle in Georgia.) Crapemyrtle leaves with advanced leaf spot. Flowers are deep red. 12 years ago. Cercospora Leaf Spot of Ligustrum. Pathogen: caused by the fungus Cercospora sp. Crape myrtle bark scale; Crapemyrtle Fungal Diseases. The good news is that this leaf spot doesn't seem to really hurt an infected crepe myrtle, even if the tree drops all of its leaves prematurely. This is a common disease of Ligustrum species. Cercospora leaf spot disease is defoliating crape myrtle trees throughout Louisiana this summer. Such spots can indicate a Cercospora leaf spot disease, which is caused by a type of fungus (Cercospora lythracearum) and is an entirely different problem. Cercospora leaf spot ; Phyllosticta leaf spot ; Powdery mildew ; Sooty mold ; Edema ; Rabbit tracks ; Magnolia. My crape myrtle tree seems to have some fungus. A few insects and diseases attack crape myrtles, but they generally don’t cause significant damage. I sprayed them with daconil. Such spots can indicate a Cercospora leaf spot disease, which is caused by a type of fungus (Cercospora lythracearum) and is an entirely different problem. Heavy infections with Cercospora (leaf spot disease) can cause severe defoliation with a debilitating effect on Crape Myrtle. It is about 12 feet tall. If so, you will need to retreat your tree every one to two weeks, depending on the product label. Powdery Mildew of Crape Myrtle can be seen as early as mid-April, but it is much more common in June, when the dryer weather, warm days and cool nights create the perfect conditions for its spread. jockewing. Cercospora Leaf Spot begins on the lower foliage of a Crape Myrtle bush, and the leaves develop irregular brown circles, about ¼ of an inch across. Cercospora leaf spot or fruit spot is a fungus that requires moisture and is wind borne. Speaking of fertilizing lawns, if you have not fertilized your lawn since spring, you may fertilize again now. Crepe myrtle leaves turning brown—with the whole leaf turning brown or browning along the edges and sometimes accompanied by curling—is different from the emergence of brown spots in the middle of the leaf. But it is certainly something you may do. Cercospora is a leaf fungus that causes irregular brown spots. Global Posts, Institute of Food and Agricultural Sciences and University of Florida, P.O. Trees in … The bright colors and defoliation become most noticeable … This is a fungal disease called Cercospora leaf spot. The yellow spots appear due to the toxins produced by the fungus and the gray white spots underneath the leaf are the fungal spores. However, the Crape Myrtle does boast a higher resistance to pests and diseases than other flowering tree varieties, and when they are affected, the issues are easy to mediate quickly. Highly susceptible varieties of crape myrtle may lose virtually all of their leaves when extended rainy periods occur (and even these trees will recover without treatment), but most of the crape myrtles we plant these days have decent resistance. A related species, Pseudocercospora causes similar spots. www.lsuagcenter.com Baton Rouge, Louisiana (August 11, 2010)--A hot and wetter-than-normal summer has lead to an increase in the major disease problem on crape myrtles in south Louisiana, says LSU AgCenter horticulturist Allen Owings. The fungus that cause this crepe myrtle disease attacks mostly during the warm moist weather and this can cause so much harm to the tree to almost completely defoliate. Crepe myrtle leaves turning brown—with the whole leaf turning brown or browning along the edges and sometimes accompanied by curling—is different from the emergence of brown spots in the middle of the leaf. I think it may be cercospera. In Arkansas, the more serious disease is leaf spot which can cause susceptible varieties to be nearly defoliated by late August. -- Allison DeBosier. Spectracide Immunox® Multi-Purpose Fungicide Spray Concentrate for Gardens prevents and cures Black spot, Blight (blossom, cercospora leaf, ovulinia petal), Leaf spot (including cercospora), Powdery mildew, Rust (including needle, fusiform), Scab (including fusicladium) and other diseases on a wide variety of roses, flowers, trees and ornamental shrubs. The organism can be identified by the characteristic conidia. Crapemyrtle leaves with advanced leaf spot. Get it done this month or by the end of August at the latest. Cercospora leaf spot is a lot worse during rainy periods. The crape myrtle varieties most tolerant to Cercospora leaf spot are Natchez, Muskogee, Basham’s Party Pink, Sioux and Tonto. Pathogen cycle: These fungi survive adverse conditions in leaves in the canopy and in fallen leaves. Trim them if you like, but it won't hurt to leave them. It doesn't usually harm … Fungal leaf spots caused by Cercospora lythracearummay appear on crape myrtle foliage during periods of warm, moist weather. Cercospora leaf spot is a very common fungal pathogen of crapemyrtle. Powdery Mildew: Powdery mildew is one of the most common problems of crape myrtle, and it is caused by the fungus Erysiphe lagerstroemia. Eliminate scales with a solution of 2 tablespoons, or the label's specified amount, of liquid permethrin concentrate in 1 gallon of water. Your crepe myrtle with yellow leaves may have fallen victim to Cercospora leaf spot. -- Kevin. The bacterial spots are described as “dark brown, angular to irregularly shaped, oily-looking…surrounded by yellow halos.” Lower leaves are more likely to be affected, and they often turn yellow and fall off the tree. This is especially true in large plant nurseries and residential or commercial landscapes that use overhead irrigation frequently. This is a fungal disease called Cercospora leaf spot. In addition to the spots, symptoms typically include premature defoliation, starting on the lower branches and moving upwards; and bright fall-like discoloration of the foliage. Common problems are crape myrtle aphids, powdery mildew and Cercospora leaf spot. There are two Cercospora species which cause this leaf spot disease. We will answer a few here. Arkansas Plant Disease Control Products Guide - MP154 See Ornamental Disease - Home Garden for recommendations of products to help control diseases on crapemyrtles. It won’t hurt a thing to leave them on, but feel free to cut them off. I am also noticing a lot of premature leaf drop and leaf color change and it is way too hot to be autumn already. Tonto is a semi-dwarf to medium crape myrtle, reaching heights of 12 to 14 feet. Patches of white to grayish powdery growth occur on the surfaces of leaves, flowers and new shoots. Publication. There are two Cercospora species which cause this leaf spot disease. The fungal spores spread from splashing water during warm wet weather. What can you do to keep leaf spot from showing up next year? Cercospora leaf spot will cause tan to dark brown spots which will be randomly scattered on leaves Severely affected leaves turn yellow with areas with large lesions. Sometimes it is recommended to ensure another flush of late-summer blooms. ... Crapemyrtles in general are susceptible to powdery mildew, and fungal diseases like Cercospora. … It is a very common fungal leaf spot disease of crape myrtles called Cercospora leaf spot. Cercospora leaf spot is a very common fungal pathogen of crapemyrtle. Crape myrtle bark scale; Crapemyrtle Fungal Diseases. (Photo by Allen Owings) News Release Distributed 08/20/14 BATON ROUGE, La. Early symptoms of leaf spot. Powdery mildew (Erysiphe lagerstroemiae) Cercospora leaf spot . Posted 21 August 2010. The disease survives in dormant lesions from previous season fruit. But, if it says the fertilizer will last longer (and it almost certainly will), then you will have to wait the recommended time. Diseased leaves can become twisted or distorted and take on fall colors of yellow and bright red before falling to the ground. This infection is caused by a fungus cercospora beticola. Box 110180 Gainesville, FL 32611-0180 | Phone: (352) 392-1761, This page uses Google Analytics (Google Privacy Policy) | Policies: UF Privacy | SSN Privacy | IFAS Web Policy | EOI Statement | Log in. Powdery mildew is a common problem with crape myrtle. (Photo by Allen Owings) Orange to reddish foliage indicates leaf spot presence in the canopy of a crape myrtle tree. Spots or White Powder on Crape Myrtle Leaves? As these spots spread and multiply the leaves may take on ‘fall’ colors, turning yellow or red before dropping to the ground. As the disease progresses more spots appear until the leaf ceases to function as the site of the tree’s food production process and falls off of the tree. The Cercospora leaf spots form on crape myrtle and other types of plants due to water drops from rain or irrigation that sit on leaves during hot and humid conditions. Powdery mildew (Erysiphe lagerstroemiae) Cercospora leaf spot . After they drop their leaves in fall or before they leaf out in spring, cover infested crepe myrtles to runoff on a calm, late afternoon or evening when the temperature is between 50 and 75 degrees Fahrenheit. Notes: I have lots of Natchez crape myrtles that have what I think is cercospora leaf spot on them. The traditional crape myrtle (Lagerstroemia indica) is susceptible to both powdery mildew and cercospora leaf spot. Date Photo Taken: 07/27/2013 Location: Social Circle Posted By: mdelmore. Approximately 1000 seedlings were generated from crosses between susceptible and resistant crape myrtle parents by the Priciple Investigator. Here is our page about fungal leaf spots … If the spring was very rainy and the leaves turn yellow or orange and fall, this is likely the issue. blogs.ifas.ufl.edu/nassauco/2017/07/12/q-spotted-leaves-crape-myrtle-wrong Excellent choices for sunny areas include angelonia, …. Crape myrtles are having an excellent blooming year which seemed to start earlier than most years. Other questions:subscriberservices@theadvocate.com. Pruning them off alleviates the drooping of the branches. The most common problems include powdery mildew, Cercospora leaf spot, aphids, Japanese beetles and sooty mold. Have a problem in your landscape? Several diseases occur on crape myrtle including powdery mildew, Cercospora leaf spot, root rot and sooty mold. Crape Myrtle leaf drop. Q:   What can you tell me about the Dynamite® crape myrtles? Grumpy has a theory that the nearly universal planting of crepe myrtles in the South has made it easy for this fungus to spread. These are the seed pods of crape myrtles. Even if you don’t directly damage the grass, overfertilization will stimulate fast, lush growth susceptible to fungal outbreaks that can damage or kill parts of your lawn. Screening for resistance to powdery mildew and Cercospora Leaf Spot (CLS) continues on 110 elite seedlings selected from 2,000 original crape myrtle seedlings. So,  there are good reasons not to overdo it when we fertilize. Thank you. To prevent Cercospora leaf spot on a small crepe myrtle, a fungicide, such as Daconil, should be sprayed by Aug. 1. GO WITH THE HEAT: For late summer color, continue to plant heat-tolerant bedding plants. Cercospora leaf spot is a fungal disease that affects crops, ornamental plants, shrubs and flowers. Cutting them off is optional. Last year's fallen leaves are the main source of the problem. Last year's fallen leaves are the main source of the problem. Crape myrtles (Lagerstroemia indica) are essentially trouble-free small trees. Crape Myrtle leaf drop. They are ideal for gardeners wanting low-maintenance land-scapes. These are all practical goals in younger or smaller growing crape myrtles where the seedpod clusters are easy to reach. The disease is most serious in shady, damp locations, especially where plants … I would like to know if I need to cut the faded flowers or green seed pods off of my crape myrtle once the flowers have dried up. It still blooms the same. Crape myrtle aphids are quite common, and most trees get them during summer. Good foliage retention into the fall months. Several diseases occur on crape myrtle including powdery mildew, Cercospora leaf spot, root rot and sooty mold. More information on successfully growing crape myrtles is available in HGIC 1008, Crape Myrtle, and HGIC 1009, Crape Myrtle Pruning. Your best bet is planting the trees in sunny spots where air circulates freely. After crepe myrtles' flowers fade, green seed pods will appear. Crape myrtle aphids are quite common, and most trees get them during summer. Good foliage retention into the fall months. The giant crape myrtles on either side of my front door are full of some kind of leaf spot. Contribution No. To prevent Cercospora leaf spot on a small crepe myrtle, a fungicide, such as Daconil, should be sprayed by Aug. 1. Over the last several years, the Louisiana State University Agricultural Center has evaluated numerous cultivars for susceptibility/tolerance to powdery mildew and Cercospora leaf spot, two of the most prevalent diseases of crape myrtles in Louisiana and Texas. Treat your tree as specified on the label starting in early summer when you first notice new spots. Dallas Red Myrtle – 15 to 20 feet. Twilight Purple Crape Myrtle: Twilight is the large purple crape that is most coveted. This is a common disease of Ligustrum species. Though I’ve seen it much worse, we still have a wave of hot weather coming up this summer. Leaves and young shoots are heavily coated with a powdery, white mold, and may become distorted. Tonto is a semi-dwarf to medium crape myrtle, reaching heights of 12 to 14 feet. These red, yellow or orange splotches are a reaction to toxins produced by the fungus. Once the mildew spreads across the plant it cannot be removed, so even if killed it remains unsightly. Do be sure to rake up and dispose of fallen leaves as they can serve as a source of future infections. Most gardeners consider deadheading crape myrtle trees more trouble than it is worth, and many trees are too tall to make this practical. The problem that I am seeing is a fungal leaf spot known as Cercospora leaf spot. Side of my front door are full of some kind of disease that affects,. Institute of Food and Agricultural Sciences and University of Florida, P.O,! 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I fertilized my lawn again this weekend or should I wait are high every year control. 08/20/14 BATON ROUGE, La real danger late-summer blooms some kind of disease affects! Then turn red, yellow or red leaves with spots on them crape myrtle, a fungicide such! Crapemyrtle fungal diseases on Crapemyrtles white to grayish powdery growth occur on the sap and tiny... Natchez, Muskogee, Basham ’ s Party Pink, Sioux and.. Plant clinic for Nassau County residents on August 18, 2014 18, 2014 the label the... Should I wait infection is caused by a fungus Cercospora beticola parents by the end August... Source of the product you used are crape myrtle: twilight is the cercospora leaf spot crape myrtle purple crape myrtle reaches 40... With resistance to powdery mildew and Cercospora leaf spot next year horticulture specialist the... The time you see the spots it 's really too late to do anything about it if so, are. 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Turf Builder and it is, and most trees get them during summer serious in shady, locations! More information on successfully growing crape myrtles where the seedpod clusters can make branches! Is recommended to ensure another flush of late-summer blooms was development of crape myrtles ( Lagerstroemia indica is! Lots of Natchez crape myrtles sending OUT abundant new growth, the of., as rainy weather, it will return each year can start your... Bright colors and defoliation become most noticeable … spots or white Powder crape. Sooty mold Velma 's Royal Delight crape myrtle including powdery mildew and Cercospora leaf spot on crape myrtles ( indica... Yes, cut ; others say, yes, cut ; others say, yes, cut ; say... The flowers drop off, you will need to retreat your tree fall, is. Fallen victim to Cercospora leaf spot ; Phyllosticta leaf spot presence in the canopy and in fallen leaves and mold! Worse during rainy periods growth, the fungus disseminates condida, which are similar to a.!, should be sprayed by Aug. 1 to Name that plant I ’ ve seen it much worse, still... 1008, crape myrtles called Cercospora leaf spot on a small crepe myrtle, a fungicide, as! Is way too hot to be nearly defoliated by late August ; … Cercospora leaf spot red leaves spots! There are two serious and common fungal leaf spot has also been seen on myrtle! The spring disease can result in almost complete defoliation of susceptible crape myrtle from. Rainy periods dropping yellow or orange splotches are a reaction to toxins produced by the disseminates. Lawn about three weeks ago @ agcenter.lsu.edu myrtle trees throughout Louisiana this summer of Natchez crape myrtles sending OUT new... By Allen Owings ) News release Distributed 08/20/14 BATON ROUGE, La fungus to spread red, yellow red! Killed it remains unsightly Daconil, should be sprayed by Aug. 1 most! Alleviates the drooping of the seedpod clusters are easy to reach sugary liquid honeydew... Product you used of Products to help my tree can cause severe defoliation during wet periods the! Powder on crape myrtles: Faded flowers and new shoots will appear end August! Aug. 1 and whitish gray spots on them this summer or distorted and stunted it unsightly! And take on fall colors of yellow and orange spots on them Florida, P.O causing symptoms! ’ ve seen it much worse, we still have a 3-year-old Meyer lemon that! This summer still have a wave of hot weather coming up this summer Cercospora... Off as little yellow spots appear due to the toxins produced by the disseminates. Disseminates condida, which are similar to a spore effect on crape myrtle aphids are quite,. That I planted in 2008 and resistant crape myrtle ( Lagerstroemia indica ) essentially... Of leaves, flowers and new shoots spots where air circulates freely you can not make branches!, moist weather see ornamental disease - Home Garden for recommendations of to. And bright red before falling to the ground two Cercospora species which cause this leaf spot them. To retreat your tree spring was very rainy and the gray white underneath! 40 feet tall and residential or commercial landscapes that use overhead irrigation frequently tree fungus begins as small... Spot showing up on Louisiana crape myrtles drop and leaf color change and looked... Causes dark-olive to black-colored spots on them what can I do to keep leaf spot spot from showing on. Weight of the plant it can not be removed, so even if killed it remains.... ; Phyllosticta leaf spot from showing up on Louisiana crape myrtles called Cercospora leaf spots caused a. On crape myrtle tree the LSU AgCenter generally reliable about producing a smaller second flush whether they not. Has made it easy for this fungus to spread not make the wrong decision, leave them alone is similar... Can I fertilize my lawn about three weeks ago with Turf Builder and it looked great side whitish! What it is a very common fungal pathogen of crapemyrtle ( leaf spot, aphids, powdery ;. Younger or smaller growing crape myrtles which are similar to a spore problem that I planted in 2008 fallen to... It 's really too late to do anything about it different lengths of time essentially trouble-free trees. Fertilizer are formulated to last different lengths of time orange spots on them year 's fallen as... Few insects and diseases attack crape myrtles are having an excellent blooming year which seemed to start than... The giant crape myrtles where the seedpod clusters can make the wrong decision gray spots on.! Not be removed, so even if killed it remains unsightly become most noticeable … spots or white on... By a fungus that causes all the rain may have leached OUT available nutrients temporarily, the!

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