Zantedeschia Gold Medal Tiny Black Flies - Causes & Fixes

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Fungus Gnats

The tiny black flies are likely fungus gnat adults, which breed in the moist organic matter of the potting soil. Their larvae feed on the fine root hairs of your Zantedeschia, which can lead to stunted growth or yellowing leaves.

Very Common

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How to confirm: Set up 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 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

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3 Apply a microbial-based treatment or ensure the soil is well-aerated with perlite to prevent the moist, organic conditions gnats prefer.

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Excessive Soil Moisture

Zantedeschia Gold Medal requires well-draining soil, but constant dampness attracts fungus gnats and promotes fungal growth. High moisture levels in the substrate create the perfect breeding ground for fly larvae.

Very Common

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How to confirm: Insert your finger two inches into the soil to check if it remains saturated for long 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 breeding 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 egg laying.

Super Ninja Fungus Gnat Traps - 30 Pack

30 pcs

In Stock

3 Repot the plant in a well-draining medium amended with perlite to improve aeration and prevent future moisture retention.

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Over-fertilization with Organic Matter

Using compost or manure-based fertilizers that haven't fully decomposed can attract flies seeking nutrients. The decomposing organic material serves as a primary food source for the insect lifecycle.

Common

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How to confirm: Check if you have recently added fresh compost or uncomposted organic mulch to the pot.

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