Graptopetalum paraguayense Tiny Black Flies - Causes & Fixes

Jump to cause: Fungus Gnats Excessive Soil Moisture High Organic Matter Content

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Fungus Gnats

The tiny black flies are likely fungus gnat adults, which lay eggs in moist organic matter. Their larvae feed on the fine root hairs of Graptopetalum paraguayense, which can weaken the succulent's ability to anchor and absorb water.

Very Common

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How to confirm: Set a yellow sticky trap near the soil surface to confirm the presence of flying adults.

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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

30 pcs

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2 Allow the soil to dry out completely between waterings, as fungus gnat larvae thrive in consistently moist organic matter.

GROWIT Soil Moisture Meter SMM-V3

Water Meters

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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 substrate.

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Excessive Soil Moisture

Fungus gnat populations explode when the substrate for Graptopetalum paraguayense stays damp for too long. Succulents require well-draining, gritty soil; constant moisture provides the perfect breeding ground for these flies.

Very Common

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How to confirm: Stick your finger two inches into the soil to check if it is staying wet long after watering.

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1 Reduce watering frequency and allow the soil to dry out completely between waterings to eliminate the breeding ground for fungus gnats.

GROWIT Soil Moisture Meter SMM-V3

Water Meters

—

2 Deploy yellow sticky traps to capture the adult flying insects and disrupt their reproductive cycle.

Super Ninja Fungus Gnat Traps - 30 Pack

30 pcs

$7

In Stock

3 Repot the plant in a well-draining, gritty succulent mix, incorporating perlite to improve aeration and prevent future moisture retention.

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High Organic Matter Content

If your potting mix contains too much peat moss or compost, it retains more moisture and provides a nutrient-rich environment for larvae. This high organic density is highly attractive to the life cycle of black flies.

Common

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How to confirm: Examine the texture of your soil to see if it feels heavy and spongy rather than gritty and fast-draining.

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1 Apply a biological insecticide to eliminate the adult flies and larvae in the soil.