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