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White Spots / Powdery Mildew

White powdery patches on leaves are typically caused by powdery mildew, a common fungal issue. Other white spots may be mineral deposits or pest related.

가능한 원인

Powdery Mildew Fungus

Why: Thrives in warm, humid conditions with poor air circulation. Spreads via airborne spores.

Signs to check: White powdery coating on leaf surfaces, starts in patches and spreads, leaves may distort.

Hard Water Deposits

Why: Mineral-rich tap water can leave white crusty spots on leaves after misting or overhead watering.

Signs to check: Spots are crusty rather than powdery, appear where water droplets dried, can be wiped off.

Mealybug Residue

Why: Mealybugs produce white, cottony masses that can be mistaken for mildew.

Signs to check: White fluff concentrated at leaf joints and stem bases, sticky residue present.

확인 사항

1
Try wiping the white substance — does it come off easily?
2
Check if the coating is powdery (mildew) or crusty (mineral)
3
Inspect for cottony clusters and sticky residue (mealybugs)
4
Assess air circulation around the plant

다음 단계

Improve air circulation by spacing plants apart or using a fan
Remove heavily affected leaves and dispose of them
Avoid overhead watering and misting affected plants
Apply a baking soda solution (1 tsp per quart of water) as a mild fungicide
Use filtered water for misting to prevent mineral deposits

도움을 구할 때

Mildew is spreading rapidly to other plants
Leaves are yellowing, distorting, or dying beneath the coating
Plant is losing vigor despite treatment

핵심 포인트

Distinguish between fungal mildew, mineral deposits, and pests before treating. Improved air circulation is the best preventive measure.

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출처: Missouri Botanical Garden, RHS. 교육 목적으로 공개된 원예 자료를 기반으로 작성되었습니다. 출처 기관은 투명성을 위해서만 나열되며 보증을 의미하지 않습니다.

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