Black Spots
Black spots on leaves can indicate fungal disease, bacterial infection, or severe environmental stress. The cause matters for treatment.
가능한 원인
Fungal Black Spot Disease
Why: Fungal pathogens cause dark spots that expand and may cause leaf drop. Common on roses and other susceptible plants.
Signs to check: Round black spots with fringed or feathery edges, leaves yellow around spots and drop.
Bacterial Infection
Why: Bacteria can cause dark, water-soaked lesions that turn black as tissue dies.
Signs to check: Irregular black areas that may appear greasy or water-soaked, may have a foul smell.
Cold Damage
Why: Exposure to freezing or near-freezing temperatures causes cell death, appearing as black patches.
Signs to check: Black areas appeared after cold exposure, tissue is soft and water-soaked initially.
Severe Overwatering
Why: Chronic overwatering can cause dark spots as root damage leads to tissue death in leaves.
Signs to check: Black spots accompanied by yellowing, mushy stems, and constantly wet soil.
확인 사항
- 1Note the shape and texture of the black spots
- 2Check if spots are dry and crispy or wet and mushy
- 3Review recent temperature exposure — any cold events?
- 4Assess soil moisture and watering habits
- 5Check for spreading to other leaves or plants
다음 단계
- Remove and discard all affected leaves — do not compost them
- Improve air circulation and avoid wetting foliage
- If fungal, apply a copper-based fungicide following label directions
- If cold damage, move to a warmer location and avoid further exposure
- Sterilize pruning tools between cuts to avoid spreading pathogens
도움을 구할 때
- Black spots are spreading rapidly across the plant
- Stems or crown are turning black (may be fatal)
- Strong foul odor accompanies the black areas
핵심 포인트
Black spots are more serious than brown spots and often indicate disease. Remove affected tissue promptly and identify the cause to prevent spread.
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출처: Missouri Botanical Garden, RHS, NC State Extension. 교육 목적으로 공개된 원예 자료를 기반으로 작성되었습니다. 출처 기관은 투명성을 위해서만 나열되며 보증을 의미하지 않습니다.