Hibiscus is a genus of rather large flowering plants that live in warm, tropical environments. Hibiscus flowers contain at least five petals and range almost every color of the spectrum. The beauty of this plant species can be disrupted, however, if disease sets in. There are a number of fungal diseases that can affect hibiscus plants, as well as a few physiological disorders. Read below to learn more about common hibiscus diseases.
Leaf spots are brown or black spots that develop on hibiscus leaves and are the result of several fungal diseases. One such fungus is sooty mould, growing on the secretion of mealy bugs, aphids and whiteflies. To rid your hibiscus plant of leaf spots, remove all infected leaves and spray the plant with fungicide. Also be sure to kill any insects that are on or around the plant.
Root rot cause the softening of roots and sometimes stems and, like leaf spots, it is the result of several different fungal diseases. Root rot can deceive hibiscus owners because it often causes the plant to wilt, leading the owner to over-water the plant. This will actually make the problem worse, as root rot is generally caused by over-watering or improper drainage in the first place. To remove root rot, temporarily stop watering and apply a fungicide to your hibiscus.
Bud drop is a physiological disorder that affects hibiscus plants, meaning it is not the result of fungus, bacteria or virus. Bud drop can result from improper soil, watering or location. Over-fertilization can also cause the disorder, as buds tend to drop when they receive too much nitrogen. To solve bud drop, move your hibiscus plant to a new location and make sure your watering and fertilization plans are correct for your species of hibiscus.
Sometimes, hibiscus leaves near the top of the plant can turn yellow and drop unexpectedly. This phenomenon is generally the result of excessive moisture or applying an inappropriate insecticide. The yellow leaves will eventually drop, resulting in no fundamental harm to your plant. There is really no solution for yellow leaves, other than maintaining proper moisture levels and ceasing the application of any improper insecticides.