Viola cornuta Red White Cottony Spots - Causes & Fixes

Jump to cause: Mealybug Infestation Powdery Mildew Cottony Blight (Sclerotinia)

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Mealybug Infestation

Mealybugs are small insects that secrete a white, waxy, cottony substance to protect themselves. They attach to the stems and leaf undersides of Viola cornuta, sucking the sap and causing plant decline.

Very Common

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How to confirm: Inspect the junctions between leaves and stems closely for tiny, moving white insects or sticky residue.

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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 or neem oil to kill the insects and remove the waxy coating.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

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

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Powdery Mildew

This fungal disease appears as white, flour-like patches on the surface of the violet's foliage. It thrives in high humidity and poor air circulation around the dense Viola cornuta foliage.

Very Common

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How to confirm: Check if the white spots can be wiped off the leaf surface with your finger; if they smear or rub off, it is likely fungal.

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1 Apply an organic fungicide to the affected foliage to eliminate the powdery mildew spores and prevent further spread.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

2 Improve air circulation around the dense foliage and reduce humidity by avoiding overhead watering.

3 Prune and dispose of any heavily infected leaves to prevent the fungus from spreading to healthy parts of the plant.

Fiskars 5/8" Bypass Pruning Shears

Cutting Tools

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Cottony Blight (Sclerotinia)

This soil-borne fungal pathogen can cause white, cottony mycelium to emerge from the base of the Viola stems. It eventually leads to stem rot and rapid wilting of the plant.

Common

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How to confirm: Examine the crown where the stems meet the soil for any signs of mushy, decaying tissue covered in white fuzz.

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1 Remove and destroy all infected plant material and any surrounding debris to prevent the fungal spores from spreading to healthy plants.

2 Apply a fungicide to the base of the stems to control the spread of the mycelium and protect the remaining healthy tissue.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

3 Improve air circulation around the plant and avoid overhead watering to reduce the moisture levels that promote Sclerotinia growth.