Removing Infected Foliage If, despite your best efforts, the Rudbeckia hirta in your garden becomes infected with rust, mold or mildew, remove infected stems and leaves, both from the plant and the ground. see more; Family Asteraceae . The dark center or eye of the flower head holds 250 to 500 individual flowers, and to pollinators, each one of these is a shallow nectar cup. Black-eyed Susans are moderately resistant to deers once fully established. However, by law, everyone has a general biosecurity obligation (GBO) to take reasonable and practical steps to minimise the risks associated with invasive plants and animals under their control. Black-eyed Susan is a species of Thunbergia, which are vigorous, perennial, twining vines native to northern India and tropical Africa. Key diseases infecting rudbeckia are leaf spot and aster yellows. Black-Eyed Susans are an extremely hardy plant, but even the hardiest of plants can succumb to disease. Rudbeckia spp. Leaf spot is a common fungal disease on black-eyed susans this time of year, but it's too late to do much about it now. For time to time snails, slugs, and aphids may eat the leaves of this plant. A thread in the Garden Pests and Diseases forum, titled Messy Pest eating Thunbergia Black Eyed Susan Vine Solving Problems of Black Eyed Susan Black-eyed Susan is a pretty tough plant and doesn't suffer many problems. Why? A popular garden species, black-eyed Susan can smother native vegetation if it spreads into native bushland. Why? Black-eyed Susan can be susceptible to a leaf spot disease called Septoria. Affected plants show yellowing and falling off of leaves caused by white fungal growth. This genus is most commonly recognized as the parent family of the Rudbeckia hirta species, or the black-eyed Susan. (Black-eyed Susan)-Stem Rot Cause Sclerotinia sclerotiorum , a fungus that produces hard, black sclerotia, which can survive many years in soil. The most common disease of these plants is powdery mildew, which occurs when the plants are frequently subjected to humid conditions. They are, however, susceptible to aphids. Black-eyed Susans are also subject to … Native to the United States, black-eyed Susans thrive in U.S. Powdery Mildew. Black-eyed Susans generally grow between 1 and 3 feet tall (though they can grow taller) and can spread between 12 to 18 inches, so plant seeds closer to prevent lots of … A thread in the Garden Pests and Diseases forum, titled Is this blight on Black-Eyed Susan? It has become common in coastal regions of Queensland and in eastern … Leaf Spot. Black-eyed Susans are easy to grow and will attract many pollinators to your garden. Avoid this by planting Rudbeckias in full sun with … Plants in the Rudbeckia genus, most often referred to as coneflowers and black-eyed Susans, have warm yellow to red, multiple-petaled flowers surrounding a cone-shaped center. Pests and Diseases. Black-eyed Susan is not a prohibited or restricted invasive plant under the Biosecurity Act 2014. Rudbeckia represents the Aster family’s coneflower genus. Genus Rudbeckia may be annuals, biennials or rhizomatous herbaceous perennials, with simple or pinnately divided leaves and large daisy-like flower-heads with yellow or orange rays surrounding a prominent conical disk . I now water our black-eyed Susan sparingly, only on the hottest days and always in the morning. These are shallow enough that even small wasps and flies can drink from them,… Plants in the Rudbeckia genus, most often referred to as coneflowers and black-eyed Susans, have warm yellow to red, multiple-petaled flowers surrounding a cone-shaped center. Pests The two primary pests that prey upon black eyed susans are aphids and the cabbage worm . Once established, it is difficult to control. Septoria leaf spot of rudbeckia is characterized by brown lesions on the leaves. A thread in the Garden Pests and Diseases forum, titled Is this blight on Black-Eyed Susan? A thread in the Garden Pests and Diseases forum, titled What is wrong with my Black-eyed Susan Vine! Insects, Diseases and the Black Eyed Susan About Black-Eyed Susans. Leaf spot is a common fungal disease on black-eyed susans this time of year, but it's too late to do much about it now. Black-eyed Susan takes its name from the black centres of its striking yellow-orange flowers. The disease shows up as irregular black spots on the leaves. For time to time snails, slugs, and aphids may eat the leaves of this plant. Solving Problems of Black Eyed Susan Black-eyed Susan is a pretty tough plant and doesn't suffer many problems. Sclerotia germinate best when soil temperature is 55°F to 60°F. Knowing what diseases are possible is one of the easiest ways to treat or prevent disease from occurring in your Michigan garden of Black-Eyed Susans. While there are very few growing problems with black eyed susan (other than the plant perhaps growing too large and needing to be divided), there are some pests and diseases to be prepared for. A thread in the Garden Pests and Diseases forum, titled Green bumps on Black Eyed Susan leaves - Aliens? This can disfigure the plant significantly if the weather is favorable, wet, hot and humid.