Zantedeschia Odessa Tiny Black Flies - Causes & Fixes

search Possible Causes

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Fungus Gnats (Sciaridae)

The larvae of these flies live in the top layer of organic matter and feed on decaying plant material or root hairs. In Calla Lilies, they thrive in the consistently moist, rich soil required for 'Odessa' to bloom.

Very Common

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How to confirm: Set a yellow sticky trap near the base of the foliage 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

30 pcs

In Stock

2 Allow the top inch of soil to dry out completely between waterings to disrupt the larvae's moist habitat.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

3 Apply a thin layer of coarse sand or perlite to the soil surface to create a physical barrier that prevents adults from laying eggs.

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Excessive Soil Moisture

While Calla Lilies enjoy moisture, waterlogged soil creates an ideal breeding ground for fungus gnat larvae and can lead to rhizome rot. Frequent top-watering without adequate drainage promotes this cycle.

Very Common

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How to confirm: Stick your finger two inches into the soil to check if it remains saturated even after several days of drying time.

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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 and ensure the container has adequate drainage to prevent waterlogging.

Espoma Organic Potting Soil Mix

15.1 L

$22

In Stock

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High Organic Matter Decomposition

The use of overly decomposed compost or peat-heavy potting mixes provides an abundant food source for fly larvae. As this organic matter breaks down, it releases CO2 and moisture that attract adult flies.

Common

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How to confirm: Inspect the surface of the soil for small amounts of white, worm-like larvae moving through the substrate.

build How to fix it

shopping_cart Recommended Products

1 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

In Stock

2 Reduce moisture levels by allowing the top inch of soil to dry out, as damp organic matter fuels larvae development.

GROWIT Soil Moisture Meter SMM-V3

Water Meters