Most common zinnia cultivars and Z. haageana are susceptible. Alternaria brassicae: Common problem for brassica crops, causes damping off in young plants & leaf spot in older ones. Do you grow your zinnias mainly for cutting flowers? Name: Lily (Zone 11) cornflower Nov 6, 2016 8:39 AM CST. The spots have grown with the leaves and gotten slightly worse. Hi all , I have not come here for a long time. 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. Several spots may run together, killing the entire leaf. As the fungus takes hold, the plant’s leaves will turn yellow and fall off. Spray with recommended fungicides two or three times during the season. After reaching 5 feet tall, they developed small brown spots on the leafs. Views: 5699, Replies: 9 » Jump to the end. But now, some of those plants have ugly leaf like this. 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. Numerous yellow or tan spots can develop across the leaf forming irregular dead areas. Leaf spot will also cause problems for strawberry plants. All are easier to prevent than to cure. It's nice to have new home, new domain. Alternaria brassicola: Also impacts brassicas, causing brassica dark leaf spot. I have attached pictures to this email. Viruses: Many virus diseases affect zinnias. Leaf Spot (fungus – Cercospora zinniae): Small, roundish spots with gray or whitish centers. Fungal leaf spot will infect aspen and poplar trees. These include fungal leaf spot, powdery mildew (which looks like someone sprinkled flour over your plants) and blight. 1. They are difficult to impossible to prevent, but here are some ideas for you. Bacterial leaf spot will also infect some annual and perennial flowering plants including geraniums, zinnias, purple cone flowers and black-eyed Susan. Leaf loss in this manner will cause the plant stress, meaning that it will fail to flower or fruit. 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 … Pests and Diseases forum: Zinnia leaf problem. Asked August 8, 2015, 12:11 AM EDT. Some started indoors and some direct seeded. I am planting zinnia from seed. Zinnias are prone to two leaf diseases in the Northeast: powdery mildew and leaf spot fungus. The Crystal and Star series are highly resistant while the Profusion series are moderately resistant. Can also cause respiratory issues in humans. Zinnias are susceptible to a variety of fungal diseases. If untreated, the small white spots will grow, forming a root-like structure. Brown spots on zinnia leaf. I have several varieties of zinnias growing. Ok. Alternaria alternata: Causes leaf spots, blights, and rots on over 380 plant types. This saps the plants leaves of nutrition and also prevents photosynthesis.

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