Control bud rot by spraying marigolds with a Mancozeb solution (2 grams of per liter of water). Marigolds are common companion plants, which appear to repel many pest insects. Do not compost plant parts; put them in the trash to avoid spreading the disease. Use containers that drain well and avoid using saucers, which can catch water and cause root rot. It is caused by Alternaria dianthi. As far as is practicable remove all old flowers and infected leaves. Leaves Stippled, Discolored, Webbed Due to Mites Various mites, notably the two-spotted (or red) spider mite, sometimes attack marigolds. If space is limited and the same soil must be used yearly, select resistant marigold varieties. Flowers Yellow-green; Deformed; Shoots Spindly, Leaves Discolored and Distorted; Plants Stunted, Marigold Leaves Are Pale And Have Little White Spots, Marigolds Have Slime On Them And Are Dying, Marigolds Look Like Seed Pods And Do Not Open To Flower, African Marigold Heads Are Getting Cut Off, Will Marigolds Recover After Flower Tops Have Been Eaten By Animals, Recently Planted Marigold Flowers Are Shriveling Up, Marigold Leaves Are Purple And Curling Up, Marigold Seedlings Are Wilting And Very Thin At Base Of Stems. Hindsight is 20/20, but prevention is a crucial part of the strategy. So, this holiday season, we created a giving campaign for two of our favorite non-profits who are working to help put food on the tables of hungry families across the U.S. and around the world. It starts on lower leaves and progresses upward. Verticillium wilt is a fungal disease that results in the wilting of leaves of marigolds as well as chrysanthemums and dahlias. Fortunately, problems with marigolds are rare and easily fixed, leaving you with happy plants and a season of golden blooms. Don't smoke or use tobacco products when working with plants. Plants wilt and die early. Pinch or clip off and discard young infected shoots in the spring as soon as they show wilt. Hopefully, it’ll help make your holiday season as special as possible. Removing infected plant material can also help limit the spread of disease. As mentioned, fungal marigold plant diseases occur most often. Treat as described above. It is spread to marigolds by leafhoppers and aphids. Can't tell what size pot they're in, maybe they need more root room or need to be planted into the ground. If pH is too low, you will need to amend the soil with lime for the next year’s plants. Marigolds are not tolerant of low pH soils. Bacterial leaf spot is another disease in marigold plants. The ray and disc florets also turn brown. They are fairly resistant to insect issues, but diseases in marigold plants are an occasional problem. A soil-borne fungus, spores can … Control weeds in and around the garden. In fact, most can be cured by using different cultural methods. Sign up to get all the latest gardening tips! And remember to treat the soil before planting new. If pH is too low, you will need to amend the soil with lime for the next year’s plants. Pick off and discard infected leaves. Spray healthy plants with a garden sulfur fungicide to protect them from infection. Happy holidays from all of us at Gardening Know How. With our brand new eBook, featuring our favorite DIY projects for the whole family, we really wanted to create a way to not only show our appreciation for the growing Gardening Know How community, but also unite our community to help every one of our neighbors in need during these unprecedented times. Avoid overwatering. If things still don't get better, may have to just discard the plant. Mites are tiny spider-like pests about the size of a grain of black pepper. Disinfect garden tools and wash hands after handling infected plants. Either red, black, or brown, they feed by sucking plant juices, removing chlorophyll and causing small white dots to appear on the foliage. In most cases, simply discontinuing overhead watering can stop the formation and spread of spores. Remove dead plant debris promptly from the garden, to reduce overwintering spore populations. For more information see the file Dealing With Fungal Disease on FlowersBlack Spots With Spore Bodies On Leaves Means Leaf SpotThis fungal disease causes irregular gray or black spots speckled with minute fruiting bodies to form on leaves. There is no cure for this disease, so dig up and discard infected plants in the trash. Plants wilt suddenly, leaves may turn yellow first.