Zantedeschia Captain Angelo Tiny Black Flies - Causes & Fixes

search Possible Causes

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Fungus Gnats

These tiny black flies are the larvae of fungus gnats, which thrive in the moist, organic-rich soil preferred by Zantedeschia. The adults emerge to lay eggs, while the larvae feed on decaying organic matter and can occasionally damage the developing root system of the Calla Lily.

Very Common

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How to confirm: Set 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 reproductive cycle.

Super Ninja Fungus Gnat Traps - 30 Pack

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2 Allow the top inch of soil to dry out completely between waterings to make the environment less hospitable for larvae.

GROWIT Analog Soil Moisture Meter

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 reaching the moist soil to lay eggs.

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Overwatering and Soil Aeration Issues

Zantedeschia 'Captain Angelo' requires well-draining soil; constant saturation creates a perfect breeding ground for fungus gnat larvae. Excessive moisture also weakens the rhizome, making it more susceptible to fungal pathogens.

Very Common

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How to confirm: Insert your finger two inches into the soil to check if it remains damp for extended periods.

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1 Reduce watering frequency and allow the top inch of soil to dry out completely before watering again to disrupt the fungus gnat life cycle.

GROWIT Soil Moisture Meter SMM-V3

Water Meters

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2 Apply yellow sticky traps near the soil surface to capture adult flies and prevent further breeding.

Super Ninja Fungus Gnat Traps - 30 Pack

30 pcs

In Stock

3 Repot the plant in a well-draining medium enriched with perlite to improve soil aeration and prevent future saturation.

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Decaying Organic Matter in Potting Mix

If the potting medium contains large amounts of peat moss or unfinished compost, it provides an abundant food source for fly larvae. As old rhizome tissue decays within the pot, it attracts scavengers like black flies.

Common

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How to confirm: Gently sift through the top layer of soil to look for small, translucent larvae moving near the surface.

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1 Remove the plant from the pot and discard the old, decaying potting medium to eliminate the larvae's food source.

2 Repot the Calla Lily in fresh, well-draining organic potting soil to prevent future organic decay.