Zantedeschia Captain Murano Tiny Black Flies - Causes & Fixes

search Possible Causes

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Fungus Gnats

The tiny black flies are likely the adult stage of fungus gnats, which thrive in the moist organic matter of Calla Lily potting soil. Their larvae feed on decaying organic material and can damage the delicate root system of 'Captain Murano' by feeding on fine root hairs.

Very Common

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How to confirm: Place a yellow sticky trap near the foliage to confirm if the flying adults are being captured.

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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

30 pcs

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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 or sand to create a physical barrier that prevents adults from laying eggs in the organic matter.

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Overwatering and Soil Aeration Issues

Frequent moisture in the Calla Lily substrate creates an ideal breeding ground for fungus gnat larvae. If the 'Captain Murano' soil stays saturated, it leads to low oxygen levels which attracts these pests and increases risk of rhizome rot.

Very Common

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How to confirm: Insert your finger two inches into the soil to check if it is staying damp for too many consecutive days.

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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 Calla Lily in a well-draining medium amended with perlite to improve soil aeration and prevent rhizome rot.

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Excessive Organic Matter in Potting Mix

A substrate that is too rich in decomposing peat or compost provides a high-nutrient food source for larvae. 'Captain Murano' prefers well-draining soil, and high levels of decaying matter attract moisture-seeking insects.

Common

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How to confirm: Examine the potting medium to see if it contains large amounts of uncomposted bark or heavy peat moss.

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1 Apply a biological insecticide to eliminate the adult flies and larvae by targeting the pest lifecycle.