Mammillaria parkinsonii · Succulent
Photo: Stickpen · Public domain · cropped from original
Root rot: Ensure fast-draining gritty compost and water only when the soil is completely dry.
Mealybugs: Isolate plant and treat with insecticidal soap or a systemic insecticide.
Scale insects: Remove manually with alcohol-dipped cotton bud or apply horticultural oil.
Overwatering: Reduce watering frequency and improve drainage to prevent waterlogging.
Sunburn: Acclimatise gradually to bright light and avoid direct midday summer sun.