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Defining Diseases: A Guide for Indoor Plant Growers

Defining Diseases: A Guide for Indoor Plant Growers

Term Definition Characteristics Examples Emoticon Image Link
Powdery Mildew A fungal disease that forms a white or gray powdery coating on leaves and stems. White, powdery spots on leaves and stems. Powdery Mildew (Begonias, African Violets) 🌿❄️ Powdery Mildew Image
Root Rot A condition in which roots decay due to overly wet soil or fungal infection. Blackened, mushy roots, stunted growth. Root Rot (Pothos, Peace Lily) 🌱💧 Root Rot Image
Leaf Spot A disease causing small, round spots on leaves, which can be fungal or bacterial. Small, round spots on leaves, can be yellow, brown, or black. Leaf Spot (Dracaena, Ficus) 🍃⚫ Leaf Spot Image
Botrytis (Gray Mold) A fungal disease that causes gray, fuzzy mold on leaves, stems, and flowers, often in cool, damp conditions. Gray, fuzzy mold on leaves, stems, and flowers. Botrytis (Orchids, Geraniums) 🌫️🌸 Botrytis Image
Anthracnose A fungal disease causing dark, sunken lesions on leaves and stems. Dark, sunken spots on leaves and stems. Anthracnose (Fiddle Leaf Fig, Rubber Plant) 🍂🖤 Anthracnose Image
Mealybugs Small, sap-sucking insects covered in a white, powdery wax that can cause stunted growth. White, cotton-like clusters on leaves and stems. Mealybugs (Succulents, Orchids) 🐛🍃 Mealybugs Image
Spider Mites Tiny arachnids that cause yellowing and speckling of leaves, often with webbing. Yellowing leaves, webbing on undersides. Spider Mites (Spider Plants, Palms) 🕸️🍃 Spider Mites Image
Whiteflies Small, white insects that feed on plant sap, causing yellowing and wilting. Yellowing leaves, visible small white insects. Whiteflies (Jade Plants, Hibiscus) 🦟🍃 Whiteflies Image
Aphids Small, sap-sucking insects that can cause stunted growth and transmit diseases. Clusters of small insects, sticky residue, curled leaves. Aphids (Various indoor plants) 🐛🌿 Aphids Image
Thrips Tiny, slender insects that can cause silvering of leaves and transmit plant viruses. Silvered leaves, stunted growth. Thrips (Begonias, African Violets) 🪲🍃 Thrips Image
Scale Insects Small, immobile insects covered by a hard, protective coating that feed on plant sap. Hard, brown or black bumps on stems and leaves. Scale (Ficus, Ivy) 🐞🌿 Scale Image
Leaf Blight A disease causing large, irregular dead areas on leaves. Irregular, dead patches on leaves. Leaf Blight (Philodendrons, ZZ Plant) 🍃⚫ Leaf Blight Image
Edema A physiological disorder caused by water imbalance, resulting in blister-like swellings on leaves. Blister-like swellings on leaves. Edema (Pothos, Peace Lily) 🍃⚪ Edema Image
Sunburn Damage caused by excessive exposure to direct sunlight, leading to white or brown patches on leaves. White or brown patches on leaves. Sunburn (Succulents, Fiddle Leaf Fig) ☀️🍃 Sunburn Image
Chlorosis A condition where leaves produce insufficient chlorophyll, causing yellowing. Yellowing of leaves, often with green veins. Chlorosis (Snake Plant, Pothos) 🍃🟡 Chlorosis Image
Leaf Curl A condition where leaves curl up or down, often due to pests or environmental stress. Curling of leaves, stunted growth. Leaf Curl (Fiddle Leaf Fig, Rubber Plant) 🍃↩️ Leaf Curl Image
Damping-Off A disease that affects seedlings, causing them to rot at the base and collapse. Seedlings collapse and die, usually at soil level. Damping-Off (Seedlings) 🌱❌ Damping-Off Image
Phytophthora A soilborne disease causing root and stem rot, leading to plant collapse. Root and stem rot, plant collapse. Phytophthora (Philodendrons, Fiddle Leaf Fig) 🌱💧 Phytophthora Image
Rust A fungal disease that causes reddish or brownish spots on leaves and stems. Reddish-brown pustules on leaves and stems. Rust (Geraniums, Begonias) 🌿🟤 Rust Image
Sooty Mold A black, sooty fungus that grows on the honeydew excreted by sap-sucking insects. Black, sooty coating on leaves and stems. Sooty Mold (Ficus, Citrus Plants) 🌿🖤 Sooty Mold Image
Gall Abnormal swelling or growth on leaves, stems, or roots, often caused by insects or disease. Swellings or growths on plant parts. Gall (Ficus, Hibiscus) 🍃⚪ Gall Image
Viral Mosaic A virus that causes mottled, mosaic-like patterns on leaves and can stunt growth. Mottled leaves, distorted growth. Mosaic Virus (Orchids, African Violets) 🍃🦠 Mosaic Virus Image
Bacterial Leaf Spot A bacterial disease causing water-soaked spots that turn brown or black on leaves. Water-soaked spots on leaves. Bacterial Leaf Spot (Philodendrons, Pothos) 🍃⚫ Bacterial Leaf Spot Image
Calcium Deficiency A nutrient deficiency causing distorted and necrotic growth at the tips of leaves. Necrotic leaf tips, stunted growth. Calcium Deficiency (Succulents, Tomatoes) 🍃🟡 Calcium Deficiency Image
Magnesium Deficiency A nutrient deficiency causing interveinal chlorosis (yellowing between veins) in older leaves. Yellowing between leaf veins, green veins. Magnesium Deficiency (Houseplants) 🍃🟡 Magnesium Deficiency Image
Iron Deficiency A nutrient deficiency causing interveinal chlorosis in younger leaves. Yellowing between leaf veins, green veins in young leaves. Iron Deficiency (Various indoor plants) 🍃🟡 Iron Deficiency Image
Potassium Deficiency A nutrient deficiency causing brown scorching and curling of leaf tips and edges. Browning and curling of leaf edges, stunted growth. Potassium Deficiency (Houseplants) 🍂🟤 Potassium Deficiency Image
Nutrient Burn Over-fertilization causing leaf tips to turn brown and crispy. Brown, crispy leaf tips, stunted growth. Nutrient Burn (Houseplants) 🍃🔥 Nutrient Burn Image

 

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