Kalanchoe Passion Acheron Tiny Black Flies - Causes & Fixes

Jump to cause: Fungus Gnats Excessive Soil Moisture High Organic Matter in Substrate

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Fungus Gnats

The tiny black flies are likely the adult stage of fungus gnats, which breed in the moist organic matter of the Kalanchoe's potting soil. Their larvae feed on decaying plant roots and fungi, which can indirectly damage the succulent's root system.

Very Common

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How to confirm: Place a yellow sticky trap near the base of the plant to confirm the presence of flying adults.

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1 Deploy yellow sticky traps to capture the adult flying gnats and break the breeding cycle.

Super Ninja Fungus Gnat Traps - 30 Pack

30 pcs

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2 Allow the soil to dry out completely between waterings to make the environment inhospitable for larvae.

GROWIT Soil Moisture Meter SMM-V3

Water Meters

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3 Top-dress the soil with a layer of horticultural perlite to create a dry barrier that prevents adults from laying eggs in the moist organic matter.

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Excessive Soil Moisture

Kalanchoe Passion Acheron is a succulent that requires well-draining soil; frequent watering creates the damp environment necessary for fungus gnat eggs to hatch. Overwatering also weakens the plant's structural integrity, making it more susceptible to soil-borne pests.

Very Common

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How to confirm: Stick your finger two inches into the soil to see if it remains damp long after the top layer has dried.

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1 Reduce watering frequency and allow the top inch of soil to dry out completely before watering again to eliminate the damp environment breeding fungus gnats.

GROWIT Soil Moisture Meter SMM-V3

Water Meters

—

2 Apply yellow sticky traps near the soil surface to capture adult flies and disrupt their breeding cycle.

Super Ninja Fungus Gnat Traps - 30 Pack

30 pcs

$7

In Stock

3 Repot the Kalanchoe in a well-draining succulent mix, incorporating perlite to improve aeration and prevent future moisture buildup.

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High Organic Matter in Substrate

If the potting mix contains too much peat moss or compost, it provides an ideal nutrient-rich breeding ground for small flies. Kalanchoes thrive better in gritty, mineral-heavy mixes that dry out quickly.

Common

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How to confirm: Check if the current potting medium feels spongy and retains water for more than a week.

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shopping_cart Recommended Products

1 Apply a biological control method to eliminate the adult flies and larvae by using yellow sticky traps to capture flying insects.

Super Ninja Fungus Gnat Traps - 30 Pack

30 pcs

$7

In Stock

2 Repot the Kalanchoe in a well-draining, gritty substrate like a mix containing perlite to reduce the organic matter that attracts fungus gnats.

3 Monitor the soil moisture levels closely with a moisture meter to ensure the substrate is drying out between waterings, preventing the damp conditions gnats prefer.