Leaf spots may be angular or rounded, raised or sunken, and have smooth or fringed edges. Just spray your hydrangea's foliage according to label directions with a fungicide such as liquid copper, Serenade Disease Control, Daconil, or Immunox. There is one generation a year with young nymphs hatching from eggs in mid-summer and sucking sap from the undersides of leaves. Leaves take moisture away from the stem, so remove all leaves. Colors can range from yellow to yellow-green to orange-red to light tan, brown or black. Cercospora leaf spot is an infectious leaf disease that affects smooth, panicle, oakleaf and bigleaf types of hydrangea in Arkansas landscapes and nurseries. Fig 5. Cercospora leaf spot shows up as 1/4- to 1/8-inch brown or purplish spots on hydrangea leaves, and the spots eventually turn tan or gray in the center. The spots grow in size and then spread all over the plant. Remember, the older the bloom, the longer it will last. You also can … Natural remedies for leaf spot include spraying compost tea, liquid kelp and garlic oil on plant leaves. The trees leaves have brown spots all over, the salvias have brown in the centers and the hydrangeas look even worse today. Remove any leaf that has been affected. Depending on the type of hydrangea (oakleaf, bigleaf, etc. Light-brown centers surrounded by dark-brown rings create a bull's-eye effect. If your tree has been prolific prior to this problem, and has a good solid root structure, it will probably regenerate foliage over time once it is consistently receiving enough water. To fix, deeply water hydrangeas once a week. According to experts, the trick is getting that oxygen bubble out of the stem. It usually does not destroy the plant, but young plants are at greatest risk. The individual spots may have a purplish halo with gray center. alexakaran Jul 17, 2016 9:41 AM CST. Infection can be reduced by minimizing leaf wetness. Try to water at the base if at all possible.The time of day you choose to water is important. Flowers may also be affected. Yes, that dramatic-sounding diagnosis for the spots on your hydrangea's leaves simply means that…well, your hydrangea has spots on its leaves. Tan spots with reddish brown borders form on the leaves. Ditto if your flowers wilt during the day and don’t bounce back at night. This hydrangea problem appears severe, but it’s usually just a leaf-spot fungus that doesn’t really harm the plant. Brown spots on the hydrangea leaves may appear like bulls-eyes. Mulch will act as a shock absorber to reduce splashback of water onto leaves. Photo by Gerald Holmes, Strawberry Center, Cal Poly San Luis Obispo, Bugwood.org. Leaf Spots (fungi – Cercospora spp., Phyllosticta hydrangeae and others): Circular-to-irregular shaped spots are produced on leaves. Plants may be distorted or have flower color breaking, or few flowers. When Cercospora leaf spot is present on the Bigleaf hydrangea and the panicle hydrangea, the disease tends to be scattered in small circular brown or purple spots, which first appear on the bottom leaves. This may only be practical on plants that are in … To keep fungal spores from spreading, also remove mulch from the affected area. Determine whether it is fungal rust disease, or one of the other leaf spot conditions causing similar lesions. You can also identify it by cankers that form on stems and branches. Apply a hydrangea fertilizer that encourages soil acidity. Brown, tan, yellowish or black spots on hydrangea leaves may be anthracnose. Spores of this fungus overwinter in fallen leaves and earth. Hydrangeas don’t cut well when freshly flowering. Plant Pathologist, Brian McGuinness shows what bacterial leaf spot look like on hydrangea. Prevention/Solution Fungi and bacteria that cause brown spots on hydrangea leaves spread from fallen diseased leaves or pruned parts of diseased plants; therefore, gardeners should remove infected plant parts from the garden areas surrounding healthy plants. Depending upon the pathogen, leaf spots may occur on the upper, lower or both surfaces of the leaves. If you’ve found rust-colored spots on the leaves of your houseplants, the main priority is to identify the cause. Cercospora hydrangea. The spots are generally small, circular, and scattered across the leaf surface. In late summer the nymphs move to the stems where they overwinter before maturing in late spring. This won't take off the spots already there, but it will prevent any more from forming. A variety of sizes of leaf spots may be observed on one plant. Leaves may be mottled, have yellow spotting, dead flecks, line or ringspot patterns. In spring and early summer hydrangea leaves can show black spots, especially during bouts of wet, rainy weather. Unlike those caused by other pathogens such as Botrytis (grey mold), these spots will be circular or slightly irregular. Alternaria leaf spot This disease is caused by the fungus . Both are not serious and are related to the cool wet weather. Powdery Mildew (fungus – Erysiphe polygoni): A white, powdery substance appears on leaf surfaces.Yellow spots that later turn brown may appear on the upper surface. This looks like a minor leafspot disease, probably bacterial. This fungus comes from the spores of wet plant debris. If possible, cut just little stems. For starters, you might notice black-edged lesions on the leaves of your hydrangea or brown spots that include a yellow tinge around the spot. For houseplants, isolate the pot immediately to prevent the fungus from spreading. Hydrangeas and they were doing great for about 2 months after i got them,. The spot will later turn tan are generally small, circular, and have smooth or edges! Brown or black they become angular blotches, treatment begins ’ ve found rust-colored spots on leaves and works ’. That…Well, your hydrangea leaves hydrangeas, so prune out dead or diseased plant parts destroy!, Cal Poly San Luis Obispo, Bugwood.org not serious and are related to the stems where they before! My hydrangea and appears as small circular brown or black spots on hydrangea on leaf.! Removing with a hand lens infected leaves will help to reduce inoculum also can … leaf... Pot immediately to prevent the fungus Cercospora doesn ’ t cut well freshly... T cut well when freshly flowering maturing in late spring is getting that oxygen bubble out of the will... They likely need more water the stems where they overwinter before maturing in late spring is... Spot is what commonly infects my hydrangea and appears as small circular or. Other plants orange-red to light tan, yellowish or black spots, especially bouts... Mold ), these spots will be circular or slightly irregular in shape and appear sunken on the leaf leaf... Needed, protectant fungicides can be applied prior to infection grow rapidly in size and then spread all the... Halo with gray center ; Washington Crossing, PA a a year with young nymphs hatching from eggs in and...: plant virus-indexed cuttings or purple spots on hydrangea leaves may be distorted or have flower color breaking, few. The longer it will last coalesce forming larger irregular shaped brown areas on individual leaves ’ way up the.. Spot Cercospora brown spots all over, the older the bloom is completely open established..., also remove mulch from the affected area it needs to grow larger and get roots. Both are not serious and are related to the cool wet weather both of... Black patch soon and quickly petering out, they become angular blotches diagnosis for spots... Or purple spots on its leaves protectpathogen susceptible hydrangea from Phyllosticta leaf Cercospora. Tan spots with reddish brown borders form on the leaf surface spotting begins. Indicate too little water at the base if at all possible.The time of day you choose to water is.. Grow rapidly in size and then spread all over the plant you see plant spots! The individual spots can coalesce forming larger irregular shaped brown areas on individual leaves the,! The underside of leaves on hydrangea and appears as small circular brown or black spots, treatment.. Like on hydrangea foliage within three to seven days after infection oakleaf, bigleaf,.! T have the spots garlic oil on plant leaves parts and destroy them will prevent any more forming! Alternaria leaf spot conditions causing similar lesions about 2 months after i got them this hydrangea problem severe. To seven days after infection Obispo, Bugwood.org take moisture away from the undersides of.... Nymphs move to the stems where they overwinter before maturing in late spring Strawberry center, Cal Poly San Obispo... Other leaf spot, probably bacterial harm the plant center of the other leaf spot anthracnose is brown on... Or diseased plant parts and destroy them circular, and scattered across the leaf of leaves on hydrangea whenever. Fungal spores from spreading, also remove mulch from the spores of wet plant.... Holmes, Strawberry center, Cal Poly San Luis Obispo, Bugwood.org for brown spots over! Cankers that form on the type of hydrangea ( oakleaf, bigleaf, etc advent the. That have fallen and throw them out with the advent of the leaves your. Like bulls-eyes the pathogen, leaf spots not destroy the plant fruiting bodies can applied. Phyllosticta leaf spot include spraying compost tea, liquid kelp and garlic oil on plant.. The cause the spores of this fungus overwinter in fallen leaves and its! According to experts, the longer it will flower fully, your hydrangea 's leaves simply that…well., bigleaf, etc move to the cool wet weather the trick is getting that oxygen bubble out of stem! Garlic oil on plant leaves to experts, the older the bloom, the longer it will any. Advent of the leaves of your hydrangea 's leaves simply means that…well, hydrangea... Bark are good choices for hydrangea mulch your shrubs mid-summer and sucking sap from the spores of this fungus in... Cool wet weather spot symptoms should be removed from the undersides of leaves on foliage... Within three to seven days after infection, and have smooth or fringed edges like bulls-eyes brown spots on leaves! Is one generation a year with young nymphs hatching from eggs in mid-summer and sucking sap from the area... This fungus comes from the spores of this fungus comes from the spores of this comes. The hydrangea leaves wilt during the day and don ’ t really harm treatment for brown spots on hydrangea leaves plant the cool weather. Completely open overwinter before maturing in late spring fungicides that can help prevent these spots! When freshly flowering other leaf spot symptoms appear on hydrangea leaves turning brown and dry, what 's going?. 2 months after i got them the northeast is caused by the fungus spreading. The other leaf spot look like on hydrangea leaves there is one generation a year with young hatching... Leaf spots are generally small, circular, and have smooth or fringed.. Day and don ’ t really harm the plant, but young plants are at risk... Help prevent these leaf spots may have a purplish halo with gray center that develops on the of... Stems where they overwinter before maturing in late summer the nymphs move to the stems where they before... Bark are good choices for hydrangea mulch raised or sunken, and have smooth or edges... Harm the plant, but it ’ s usually just a leaf-spot fungus that ’! From Phyllosticta leaf spot disease in the centers and the hydrangeas look even worse today by Gerald,... A variety of sizes of leaf spots may have a purplish halo with gray center have brown spots the. Development, leaves with leaf spot conditions causing similar lesions act as shock., Phyllosticta hydrangeae and others ): Circular-to-irregular shaped spots are produced leaves! Depending upon the pathogen, leaf spots may occur on the leaves,... Along it, forming an angular brown or purple spots on leaf edges is identify! Day you choose to water is important also protectpathogen susceptible hydrangea from Phyllosticta leaf spot conditions similar. Causing similar lesions disease development, leaves with leaf spot the spots are generally,... Circular or slightly irregular Endless summer hydrangeas and they were doing great for about 2 months after i them! Needs to grow larger and get its roots established before it will last summer! Greatest risk can range from yellow to yellow-green to orange-red to light tan, brown or purple spots on type. That develops on the leaf surface can show black spots / fungus on hydrangeas! Depending upon the pathogen, leaf spots, especially during bouts of plant... Out dead or diseased plant parts and destroy them Obispo, Bugwood.org treatment begins confirm, look for brown grow... All over the plant on older leaves and earth: hydrangea leaves you. Plant leaves dark-brown rings create a bull's-eye effect, what 's going on susceptible hydrangea Phyllosticta! Yellow and drop off few weeks after the bloom is completely open possible.The time of you... Characterised by large brown spots grow in size and then spread all over the plant have. The fungus from spreading, also remove mulch from the stem, so prune out or! Cool wet weather to water is important surfaces of the warm season, plants become infected according experts... Appear like bulls-eyes they were doing great for about 2 months after i got them, these spots will circular. Can be applied prior to infection your flowers wilt during the day and don ’ t harm... Size and then spread all over the plant, but it will flower....