2/12/2024 0 Comments Red spike plant as a houseplantSeveral common problems fall under the category of cultural or environmental problems. See footnote on Table 1 about spraying houseplants outdoors. See Table 1 for examples of brands and products. Sprays of sulfur, chlorothalonil, myclobutanil, tebuconazole, or Bacillus amyloliquefaciens can be used after removing infected plant parts in order to reduce the incidence of future disease. Prevention & Treatment: Since the disease develops most rapidly under humid conditions, proper ventilation and not overwatering will help control this disease. Initial infections usually come from fungi surviving in dead and decaying plant materials or from airborne spores from wild or cultivated hosts out-of-doors. These fungi cause the formation of white, powdery growth or dry, brown, papery leaf spots. Powdery Mildew: Powdery mildew of houseplants is caused by an infection from one of several genera of fungal pathogens. Fungicides are available however, most indoor gardeners will find that these chemicals probably cost more than a new plant. If only a few roots are infected, cut out these roots and repot the plant in sterile soil. Do not overwater the plants since too much water increases the occurrence of root rot. Prevention & Treatment: Use sterilized soil and pots. ![]() Their spores can be spread by wind, splashing water, or the moving of infested soil. The fungi survive in the soil or on infected plant debris in the soil. Infected roots are brown to black and may be soft. Stems may be girdled at or near soil level by a ring of brown or black tissue. With root or stem rot, leaves and stems show noticeable wilt. Root Rot & Stem Rot: The fungi Rhizoctonia, Pythium, Botrytis, Phytophthora, Alternaria, and Sclerotinia cause these diseases. Sprays of copper soap or Bacillus amyloliquefaciens can be used after removing infected plant parts in order to reduce the incidence of future disease. Avoid low temperatures, crowding plants, and spraying or splashing water onto the foliage. ![]() Prevention & Treatment: Remove all diseased plant material. Under drier conditions, the spots do not enlarge but dry out and turn reddish-brown, giving a speckled appearance. The spots enlarge and run together during wet conditions, such as if plants are placed outside during rainy periods. Follow label directions for safe use.īacterial Leaf Spots: Plants infected with bacteria have water-soaked spots, sometimes with a yellow halo, usually uniform in size, and sometimes with a sticky ooze. Sprays of copper soap, chlorothalonil, myclobutanil, tebuconazole, or Bacillus amyloliquefaciens can be used after removing infected plant parts in order to reduce the incidence of future disease. Avoid splashing water on the foliage since this spreads the fungi. Provide good air circulation around the plants. Prevention & Treatment: Remove and destroy infected plant material. The fungi survive on dead and decaying plant matter in the soil. ![]() Sometimes the lesions run together, and the entire leaf dies. Small black dots (fruiting bodies of the fungi) may be visible in dead tissue. Spots may have a concentric ring or target pattern. Symptoms include small, brown spots with yellowish margins on the leaves. ![]() Follow label directions for safe use.įungal Leaf Spots: Several fungi can cause leaf spots. Sprays of copper soap, chlorothalonil, myclobutanil, or tebuconazole can be used after removing infected plant parts in order to reduce the incidence of future disease. Prevention & Treatment: Pick off and destroy infected leaves. Wounding enhances penetration by these fungi. The browning may extend completely around the leaf. The leaf tips turn yellow, then tan, then dark brown. DiseasesĪnthracnose: The fungi Colletrotrichum and Gloeosporium cause anthracnose. Take good care of your plants (proper fertilizing, watering, and spacing) and check them periodically for disease symptoms. Before reusing any pots, they should be scrubbed clean and rinsed in a solution of one part bleach to nine parts water to kill any disease organisms present. Diseases are not common on most houseplants grown indoors because environmental conditions are not favorable for plant pathogens to grow and infect the plants.Ĭontrol of diseases begins with prevention. Houseplants can develop many problems, but most have environmental or cultural causes.
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