Ocimum basilicum White Cottony Spots - Causes & Fixes

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Powdery Mildew

This fungal disease is highly common in Ocimum basilicum, especially in high humidity and poor air circulation. It manifests as white, flour-like patches on the leaves that can eventually lead to leaf necrosis.

Very Common

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How to confirm: Inspect the undersides of the leaves to see if the white powdery substance can be rubbed off with your finger.

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1 Immediately remove and discard all heavily infected leaves to prevent the fungal spores from spreading to healthy parts of the plant.

2 Apply an organic fungicide to the remaining foliage to control the spread of the mildew.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

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3 Improve air circulation around the basil and ensure the plant is in a location with lower humidity to prevent future outbreaks.

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Mealybug Infestation

Mealybugs are small, soft-bodied insects that secrete a white, waxy, cottony substance to protect themselves. They congregate in the leaf axils and crevices of basil plants, sucking sap and causing yellowing.

Common

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How to confirm: Look for tiny, slow-moving insects nestled in the junctions where leaves meet the stem.

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1 Isolate the basil plant immediately to prevent the mealybugs from spreading to other indoor greenery.

2 Treat the infestation by spraying the plant with an organic insecticide to eliminate the soft-bodied insects and their waxy coating.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

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3 Wipe away visible white cottony clusters from leaf axils using a cotton swab dipped in isopropyl alcohol to kill the pests on contact.

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Cottony Blight (Sclerotinia sclerotiorum)

This fungal pathogen can cause white, fuzzy mycelium to appear on the stems and base of basil plants. It typically leads to rapid wilting and stem rot in moist environments.

Common

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How to confirm: Check if the white growth is concentrated around the stem base or if the plant is experiencing sudden drooping.

build How to fix it

shopping_cart Recommended Products

1 Remove and destroy all infected plant material and stems immediately to prevent the fungal spores from spreading to healthy basil plants.

2 Apply an organic fungicide to the remaining healthy tissue to control the spread of the blight.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

3 Reduce moisture at the base of the plant and improve airflow by spacing plants further apart, ensuring the soil surface dries between waterings.