Symptoms
- check_circleWhite powdery coating on upper leaf surfaces
- check_circleWhite chalky deposits that rub off
- check_circleWhite stippling or dots (tiny marks from pests)
- check_circleWhite bleached patches from sun damage
Causes
- arrow_rightPowdery mildew — fungal disease, especially in poor air circulation
- arrow_rightHard water mineral deposits on leaves
- arrow_rightMealybug egg sacs or waxy residue
- arrow_rightSpider mite feeding damage (stippling)
- arrow_rightSun scorch on previously shaded plants
How to Diagnose
Rub a white spot gently with a finger. If it smears or comes off easily as a powder — powdery mildew. If it's a hard, chalky crust that leaves a clean leaf below — mineral deposits from watering. If there's webbing nearby — spider mites. If the mark is raised and fluffy — mealybugs.
Treatment
Powdery mildew: spray with baking soda solution or neem oil weekly. Mineral deposits: wipe leaves with a damp cloth and switch to filtered or rainwater. Spider mites: shower the plant and treat with neem oil. Mealybugs: swab with isopropyl alcohol and spray with diluted soap solution.
Prevention
Ensure good air circulation around plants. Avoid overhead watering. Use filtered or rainwater where possible. Wipe leaves monthly. Inspect regularly for early pest activity.
Affected Plants
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