Crassula nudicaulis herrei Tiny Black Flies - Causes & Fixes

Jump to cause: Fungus Gnats (Sciarid Fly) Saprophagous Flies (Decomposition Feeders) Fruit Flies (Drosophilidae)

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Fungus Gnats (Sciarid Fly)

The larvae live in the upper layers of organic soil and feed on decaying matter and fine root hairs. In succulents like Crassula, they thrive when the substrate remains consistently damp for long periods.

Very Common

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How to confirm: Place a yellow sticky trap near the soil surface to see if small black flies are captured.

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

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 waterings to disrupt the gnat life cycle.

GROWIT Soil Moisture Meter SMM-V3

Water Meters

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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.

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Saprophagous Flies (Decomposition Feeders)

These flies are attracted to the organic breakdown of old leaves or rotting stem tissue at the base of the plant. If the Crassula has accumulated dead, mushy foliage, it provides an ideal breeding ground.

Common

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How to confirm: Inspect the base of the stems for any signs of softening, discoloration, or decaying leaf matter.

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shopping_cart Recommended Products

1 Inspect the base of the plant and remove any dead, mushy, or decaying leaves and stem tissue to eliminate the breeding ground for the flies.

2 Apply a biological control to target the flies and their larvae; use a yellow sticky trap to capture adult flies.

Super Ninja Fungus Gnat Traps - 30 Pack

30 pcs

$7

In Stock

3 Ensure the plant is in a well-draining medium and avoid overwatering to prevent further organic decomposition at the soil surface.

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Fruit Flies (Drosophilidae)

While they do not feed on the plant itself, they are attracted to the fermenting sugars in overwatered, anaerobic soil or nearby decaying organic matter. They often mistake the moist surface of succulent soil for a breeding site.

Common

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How to confirm: Check if there is any fermenting compost or overripe fruit near the plant's pot.

build How to fix it

shopping_cart Recommended Products

1 Reduce watering frequency and allow the soil to dry out completely to eliminate the moist, fermenting environment that attracts fruit flies.

GROWIT Soil Moisture Meter SMM-V3

Water Meters

—

2 Set out yellow sticky traps near the plant to capture the adult flies and disrupt their breeding cycle.

Super Ninja Fungus Gnat Traps - 30 Pack

30 pcs