Senecio haworthii Tiny Black Flies - Causes & Fixes

Jump to cause: Fungus Gnats Sciarid Flies Soil Organic Matter Decomposition

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Fungus Gnats

These tiny black flies thrive in the moist, organic-rich substrate preferred by many succulents. Their larvae live in the soil and feed on decaying organic matter and occasionally fine root hairs of the Senecio.

Very Common

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How to confirm: Set up a yellow sticky trap near the pot to see if small flies are attracted to it.

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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

$7

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2 Allow the 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 Top-dress the soil with a layer of horticultural perlite to create a dry barrier that prevents adults from laying eggs in the moist substrate.

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Sciarid Flies

Similar to fungus gnats, these flies appear when there is excessive moisture in the soil. For a String of Dolphins, which requires well-draining gritty mix, frequent dampness creates an ideal breeding ground for these pests.

Very Common

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How to confirm: Check if the top layer of soil remains damp for extended periods after watering.

build How to fix it

shopping_cart Recommended Products

1 Reduce watering frequency and allow the soil to dry out completely between waterings to disrupt the breeding cycle of the flies.

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 reproduction.

Super Ninja Fungus Gnat Traps - 30 Pack

30 pcs

$7

In Stock

3 Repot the plant in a well-draining, gritty substrate like a mix containing perlite to ensure better aeration and prevent future moisture buildup.

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Soil Organic Matter Decomposition

While not a direct 'cause' of flies, an overabundance of peat-based potting soil in your Senecio mix provides the perfect food source for fly larvae. As the organic material breaks down, it attracts moisture-loving insects.

Common

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How to confirm: Examine the soil texture; if it feels very spongy and holds water like a peat moss, it may be attracting pests.

build How to fix it

shopping_cart Recommended Products

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

Super Ninja Fungus Gnat Traps - 30 Pack

30 pcs

$7

In Stock

2 Reduce watering frequency and allow the soil to dry out completely between sessions to eliminate the moist environment required by larvae.

GROWIT Soil Moisture Meter - Blue