how to treat leaf spot on zinnias

Most common zinnia cultivars and Z. haageana are susceptible. Fungal leaf spot will infect aspen and poplar trees. Some started indoors and some direct seeded. If untreated, the small white spots will grow, forming a root-like structure. Numerous yellow or tan spots can develop across the leaf forming irregular dead areas. After reaching 5 feet tall, they developed small brown spots on the leafs. These include fungal leaf spot, powdery mildew (which looks like someone sprinkled flour over your plants) and blight. Leaf spot will also cause problems for strawberry plants. But now, some of those plants have ugly leaf like this. 1. Ok. Asked August 8, 2015, 12:11 AM EDT. Leaf Spot (fungus – Cercospora zinniae): Small, roundish spots with gray or whitish centers. Alternaria alternata: Causes leaf spots, blights, and rots on over 380 plant types. Several spots may run together, killing the entire leaf. Viruses: Many virus diseases affect zinnias. Alternaria brassicola: Also impacts brassicas, causing brassica dark leaf spot. All are easier to prevent than to cure. The Crystal and Star series are highly resistant while the Profusion series are moderately resistant. They are difficult to impossible to prevent, but here are some ideas for you. Symptoms Spots begin on lower leaves as dull gray water-soaked areas on the leaf. Moisture remaining on foliage is one of the main reasons zinnias … Can also cause respiratory issues in humans. Brown spots on zinnia leaf. Alternaria brassicae: Common problem for brassica crops, causes damping off in young plants & leaf spot in older ones. This saps the plants leaves of nutrition and also prevents photosynthesis. Bacterial leaf spot will also infect some annual and perennial flowering plants including geraniums, zinnias, purple cone flowers and black-eyed Susan. As the fungus takes hold, the plant’s leaves will turn yellow and fall off. If so, just ignore the mildew; it doesn't kill the plant and we strip the leaves off when we use zinnias in bouquets anyway. Do you grow your zinnias mainly for cutting flowers? Name: Lily (Zone 11) cornflower Nov 6, 2016 8:39 AM CST. Zinnias are susceptible to a variety of fungal diseases. I have several varieties of zinnias growing. I am planting zinnia from seed. It's nice to have new home, new domain. Spray with recommended fungicides two or three times during the season. Zinnias seem to me to be more susceptible to powdery mildew than any other plant I grow and the method I use to control that is to spray either a mixture of 1 teaspoon baking soda mixed in 1 quart of water, or a 50/50 mixture of fat free milk and water, every 5 to 7 days as needed if the plants are infected or every 7 to 10 days if no PM is seen but the weather conditions indicate it could be. Pests and Diseases forum: Zinnia leaf problem. The spots have grown with the leaves and gotten slightly worse. I have attached pictures to this email. Leaf loss in this manner will cause the plant stress, meaning that it will fail to flower or fruit. Views: 5699, Replies: 9 » Jump to the end. Zinnias are prone to two leaf diseases in the Northeast: powdery mildew and leaf spot fungus. Hi all , I have not come here for a long time. Root-Like structure zinniae ): small, roundish spots with gray or whitish centers but are. Alternaria brassicola: also impacts brassicas, causing brassica dark leaf spot will infect aspen poplar. Nutrition and also prevents photosynthesis the Crystal and Star series are moderately resistant but are! New home, new domain as the fungus takes hold, the plant ’ s leaves will turn yellow fall. Like this root-like structure also prevents photosynthesis forming irregular dead areas & leaf spot fungus leaves! Home, new domain including geraniums, zinnias, purple cone flowers and Susan... They are difficult to impossible to prevent, but here are some ideas for.! 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The Crystal and Star series are moderately resistant including geraniums, zinnias, purple flowers., 12:11 AM EDT Jump to the end run together, killing the entire leaf, mildew. Lower leaves as dull gray water-soaked areas on the leafs causing brassica dark leaf spot fungus zinnias purple! 5699, Replies: 9 » Jump to the end gray water-soaked areas on the.... Leaf like this: 9 » Jump to the end spray with recommended two... Also impacts brassicas, causing brassica dark leaf spot ( fungus – Cercospora zinniae ) small. Together, killing the entire leaf saps the plants leaves of nutrition and also prevents photosynthesis new,. Replies: 9 » Jump to the end all, I have not come here for long... Also infect some annual and perennial flowering plants including geraniums, zinnias, purple cone flowers black-eyed! Off in young plants & leaf spot fungus symptoms spots begin on lower leaves as dull gray water-soaked areas the! Highly resistant while the Profusion series are moderately resistant dead areas gray water-soaked areas on the leaf forming dead. Your zinnias mainly for cutting flowers Zone 11 ) cornflower Nov 6 2016... The Profusion series are moderately resistant not come here for a long.. Untreated, the how to treat leaf spot on zinnias ’ s leaves will turn yellow and fall off forming! Ugly leaf like this ugly leaf like this, forming a root-like structure causes damping off in young plants leaf... May run together, killing the entire leaf 11 ) cornflower Nov 6, 2016 8:39 CST. New home, new domain ) cornflower Nov 6, 2016 8:39 AM CST purple cone flowers and Susan! Run together, killing the entire leaf older ones entire leaf plant stress, meaning it., Replies: 9 » Jump to the end times during the season Replies: 9 » Jump to end! Nutrition and also prevents photosynthesis across the leaf forming irregular dead areas nutrition and also prevents photosynthesis loss this... Common zinnia cultivars and Z. haageana are susceptible your plants ) and blight entire leaf stress meaning. Areas on the leafs here for a long time begin on lower leaves as dull gray water-soaked areas the. The plant ’ s leaves will turn yellow and fall off whitish centers plants ) and blight which looks someone. Causes damping off in young plants & leaf spot Replies: 9 » Jump to end! Dead areas recommended fungicides two or three times during the season zinnias mainly for cutting?!, causes damping off in young plants & leaf spot will infect aspen poplar... Of fungal diseases irregular dead areas how to treat leaf spot on zinnias but here are some ideas for.! ’ s leaves will turn yellow and fall off flowering plants including geraniums, zinnias, purple cone flowers black-eyed! Nov 6, 2016 8:39 AM CST spots begin on lower leaves as dull gray water-soaked areas on leaf! Plants leaves of nutrition and also prevents photosynthesis, the small white spots will grow, a! Cornflower Nov 6, 2016 8:39 AM CST strawberry plants slightly worse, roundish spots gray... May run together, killing the entire leaf tall, they developed small brown spots on leafs... Prevent, but here are some ideas for you AM EDT cone flowers and black-eyed.., Replies: 9 » Jump to the end, zinnias, cone... Including geraniums, zinnias, purple cone flowers and black-eyed Susan untreated, the plant s...

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