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Dieffenbachia Diseases

Circular to oval brown leaf spots have a yellow halo. Spots may become 2 inches in diameter and contain tiny black fungal fruiting structures. Avoid overhead watering. Apply mancozeb to protect healthy leaves. Small gray or dark-green leaf spots ...More…
G6515, Lighting Indoor Plants

Missouri Extension — Houseplants are popular indoor decorations. Attractive and constantly changing, they add a softness of line and provide a bit of nature indoors. However, the ideal location of a plant for decoration may not be the ideal spot for plant growth. ...More…
Norfolk Island Pine Diseases and in the Greenhouse

Small dead areas form on needles and the entire needle dies. Small black fungal fruiting bodies are seen in the dead tissue. Large portions of branches brown and needles fall. Avoid overhead watering. Keeping the surface of the foliage dry will ...More…
Department of Plant Pathology Plant Disease Fact Sheets

Translucent spots develop all over the leaves, enlarge quickly, and turn reddish-brown with purple halos. Purchase plants free of the disease. Avoid overhead watering. Discard infected plants. Maintain even soil moisture at all times. Examine ...More…
Philodendron Diseases

Translucent spots on leaf margins become reddish brown with yellow halos. Large spots are tan and irregularly shaped. Purchase plants free from the disease. Avoid overhead watering. Remove infected leaves. V-shaped yellow areas form on leaves ...More…
African Violet Diseases

Dark, reddish-brown to black rotting areas form on roots and crown. Infected petioles have a greasy appearance. Pot and propagate in pasteurized media. Do not take cuttings from infected plants. Avoid high-temperature, high-humidity conditions. ...More…
Palm Diseases

Reddish dead areas form on leaves within 5 days of exposure. Chamaedorea palms' leaf tips turn dark brown and die. On areca palms, small dead spots form in chains between leaf veins. Maintain soil pH between 6 and 6.5. Avoid using perlite and ...More…
Dracaena Diseases

New leaves have small white to yellow spots near their tips. Maintain moderate temperature, moisture, and light conditions. Long, tan to dark-brown areas form in the white stripes of "Warneckii" leaves. Leaf tips are yellow or dead on ...More…
Christmas Cactus Diseases

At the soil line, a brown spot forms. As the tissue dies, it becomes tan and falls away, removing tissue from the edge to the heavy center vein tissue. Do not injure plants at the soil line. Apply iprodione or etridiazole + thiophanate methyl to ...More…
Syngonium Diseases

Very dark green spots engulf the leaf in a soft rot that smells foul. Infected tissue falls away giving the leaf a tattered appearance. When stems are infected, lower leaves wilt and die. Translucent spots on leaf margins become dull green with ...More…
Crassula (Jade Plant) Diseases

Stems and branches collapse. The interior tissues are soft and mushy. Black line and ring patterns form on the underside of leaves. Do not take cuttings from the plant. The plant will not be killed but will continue to exhibit symptoms. Discard ...More…
Department of Plant Pathology Plant Disease Fact Sheets

Lower leaves yellow and wilt. Dark-brown spots with halos form on leaves. Roots decay. Purchase plants free of pathogen. Discard infected plants. Apply triflumizole to protect plants. Plants are stunted and vigor reduced. Tissue between leaf ...More…

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