Senecio herreianus Tiny Black Flies - Causes & Fixes

Jump to cause: Fungus Gnats Soil Moisture Imbalance (Root Rot Precursor) Saprophytic Decomposition

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Fungus Gnats

The most likely cause; these flies breed in the moist organic matter of the potting soil. Their larvae feed on plant roots and decaying organic material, often thriving when String of Bananas are overwatered.

Very Common

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How to confirm: Perform the 'sticky trap test' by placing a yellow sticky trap near the soil surface to see if small black insects are captured.

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1 Deploy yellow sticky traps to capture adult flies and prevent further breeding cycles.

Super Ninja Fungus Gnat Traps - 30 Pack

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2 Allow the top inch of soil to dry out completely before watering again to disrupt the larvae's moist breeding environment.

GROWIT Soil Moisture Meter - Blue

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3 Apply a biological control or organic insecticide to target the larvae in the soil.

Bonide Captain Jack's Neem Oil 32 oz

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Soil Moisture Imbalance (Root Rot Precursor)

While not a direct cause of flies, high moisture levels in the substrate create the perfect breeding ground for fungus gnats. This can lead to the decay of Senecio herreianus's succulent stems.

Very Common

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How to confirm: Insert your finger two inches into the soil to check if it remains damp for too long between waterings.

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

GROWIT Soil Moisture Meter SMM-V3

Water Meters

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2 Apply yellow sticky traps near the soil surface to capture and remove the adult flying insects.

Super Ninja Fungus Gnat Traps - 30 Pack

30 pcs

$7

In Stock

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

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Saprophytic Decomposition

If old, dead leaves are accumulating at the base of the plant, they provide a nutrient-rich environment for fly larvae. This decomposition process attracts various small dipterans to the pot.

Common

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How to confirm: Inspect the base of the stems and remove any mushy or blackened leaf debris from the top of the soil.

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1 Remove all dead, decaying leaves from the base of the plant and clean the top of the soil to eliminate the breeding ground for larvae.

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

Super Ninja Fungus Gnat Traps - 30 Pack

30 pcs

$7

In Stock

3 Ensure the soil surface is well-draining and consider adding a layer of horticultural perlite to improve aeration and reduce moisture retention at the base.