Haworthia retusa riyuetan Tiny Black Flies - Causes & Fixes

Jump to cause: Fungus Gnats (Sciaridae) Overwatering leading to Soil Rot Accumulation of Organic Matter

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Fungus Gnats (Sciaridae)

The tiny black flies are likely fungus gnats, whose larvae thrive in the moist organic matter of Haworthia potting soil. The adults emerge to lay eggs in the top layer of substrate, feeding on decaying organic material and occasionally damaging fine root hairs.

Very Common

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How to confirm: Set a yellow sticky trap near the pot to see if small black winged insects are captured.

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1 Deploy yellow sticky traps near the soil surface to capture adult fungus gnats and disrupt their breeding cycle.

Super Ninja Fungus Gnat Traps - 30 Pack

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2 Allow the potting medium to dry out significantly between waterings, as damp soil is the primary breeding ground for larvae.

GROWIT Soil Moisture Meter - Blue

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3 Top-dress the soil with a layer of horticultural perlite or sand to create a dry barrier that prevents adults from laying eggs in the organic matter.

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Overwatering leading to Soil Rot

Frequent moisture in Haworthia retusa riyuetan creates the perfect breeding ground for fungus gnat larvae. Excessively wet substrate also triggers fungal pathogens that provide a food source for these flies.

Very Common

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How to confirm: Stick your finger deep into the soil; if it remains damp for more than a week, you are overwatering.

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1 Immediately reduce watering frequency and allow the substrate to dry out completely to disrupt the fungus gnat life cycle and stop soil rot.

GROWIT Soil Moisture Meter SMM-V3

Water Meters

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2 Repot the Haworthia in a well-draining, gritty substrate like a mix of perlite or clay pebbles to improve aeration and prevent future rot.

3 Apply a biological control such as yellow sticky traps to capture the adult flies and prevent further breeding.

Super Ninja Fungus Gnat Traps - 30 Pack

30 pcs

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Accumulation of Organic Matter

Using a potting mix with too much peat moss or decomposed bark provides high nutrient levels for flies. Haworthia species prefer gritty, mineral-heavy substrates that dry out quickly to prevent pest infestations.

Common

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How to confirm: Inspect the soil composition; if it looks dark and spongy rather than gritty and rocky, replace it with a succulent-specific mix.

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shopping_cart Recommended Products

1 Apply a biological control to eliminate the adult and larval stages of the flies.

Super Ninja Fungus Gnat Traps - 30 Pack

30 pcs

$7

In Stock

2 Repot the Haworthia in a gritty, mineral-heavy substrate like a mix of perlite and clay pebbles to reduce organic matter and prevent future infestations.