Zantedeschia Captain Fargo 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 breed in the moist organic matter of the potting soil. Their larvae feed on the fine root hairs of the Zantedeschia, potentially causing stunted growth or yellowing leaves.

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 breeding cycle.

Super Ninja Fungus Gnat Traps - 30 Pack

30 pcs

In Stock

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

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

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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Excessive Soil Moisture / Poor Drainage

Fungus gnat populations explode when Zantedeschia rhizomes are kept in overly saturated soil. Constant moisture not only attracts flies but also increases the risk of Rhizome Rot, a common killer for Calla Lilies.

Very Common

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

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1 Reduce watering frequency and allow the top inch of soil to dry out completely to disrupt the fungus gnat breeding cycle and prevent rhizome rot.

GROWIT Soil Moisture Meter SMM-V3

Water Meters

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2 Apply a biological control like Captain Jack's Neem Oil to target the larvae and adult flies, and ensure the plant is in a well-draining container.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

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3 Repot the plant in a fresh, well-aerated medium like Espoma Organic Potting Soil Mix to improve drainage and eliminate existing larvae in the old soil.

Espoma Organic Potting Soil Mix

15.1 L

$22

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Over-fertilization with Organic Matter

The use of fresh compost or high-nitrogen organic fertilizers can attract flies and provide a food source for larvae. This excess nutrients in the top layer of soil create an ideal breeding ground for pupating insects.

Common

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How to confirm: Inspect the top inch of soil for any new organic mulch or decomposing matter added recently.

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

Super Ninja Fungus Gnat Traps - 30 Pack

30 pcs

In Stock

2 Remove the top layer of organic-rich soil where larvae are breeding and replace it with a drier, less nutrient-dense medium.