Geranium sanguineum White Cottony Spots - Causes & Fixes

Jump to cause: Mealybugs Powdery Mildew Cottony Scale

search Possible Causes

error

Mealybugs

These sap-sucking insects produce a white, waxy, cottony secretion to protect themselves while feeding on the stems and undersides of Geranium sanguineum leaves. Their feeding can lead to leaf yellowing and stunted growth in this species.

Very Common

lightbulb

How to confirm: Use a magnifying glass to check for small, slow-moving insects nestled within the white fluff at the leaf axils.

build How to fix it

shopping_cart Recommended Products

1 Isolate the plant immediately to prevent the mealybugs from spreading to your other houseplants.

2 Treat the infestation by spraying the plant with an organic insecticide/miticide to eliminate the insects and their waxy coating.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

3 Gently wipe away visible cottony clusters from stems and leaf undersides using a cotton swab dipped in isopropyl alcohol.

error

Powdery Mildew

A fungal disease that manifests as white, flour-like patches on the surface of the foliage. Geranium sanguineum can be susceptible when air circulation is poor or humidity is high around the leaves.

Very Common

lightbulb

How to confirm: Check if the white spots can be rubbed off with your finger; if they appear more like a dusty coating than distinct clumps, it is likely fungal.

build How to fix it

shopping_cart Recommended Products

1 Apply an organic fungicide to the affected leaves to eliminate the fungal spores and prevent further spread.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

2 Prune and dispose of heavily infected foliage to reduce the fungal load and improve airflow around the plant.

3 Increase air circulation around the plant and avoid overhead watering to keep the foliage dry and reduce humidity.

warning

Cottony Scale

Certain types of scale insects produce a white, flocculent mass that resembles cotton. They attach firmly to the stems of the Cranesbill, draining nutrients and potentially causing dieback.

Common

lightbulb

How to confirm: Gently scrape a white spot with a fingernail; if you find a hard, shell-like insect underneath, it is scale.

build How to fix it

shopping_cart Recommended Products

1 Treat the affected stems with an organic insecticide spray to eliminate the scale insects and their protective white masses.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Manually remove visible cottony clusters using a cotton swab dipped in isopropyl alcohol to prevent further nutrient drainage.

3 Inspect surrounding plants and improve airflow around the Geranium to reduce the likelihood of future infestations.