Calathea makoyana Tiny Black Flies - Causes & Fixes

search Possible Causes

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Fungus Gnats

The larvae of these flies live in the upper layers of the soil and feed on organic matter and decaying roots. In Calathea, high soil moisture levels required for their humidity-loving nature create the perfect breeding ground for these pests.

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 the adult flying gnats and break the breeding cycle.

Super Ninja Fungus Gnat Traps - 30 Pack

30 pcs

In Stock

2 Reduce watering frequency and allow the top inch of soil to dry out to eliminate the moist environment larvae need to survive.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

3 Apply a microbial-based soil drench or supplement to improve soil health and target larvae in the organic matter.

FoxFarm Bush Doctor Microbe Brew 1 Gallon

3.8 L

$115

In Stock

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Overwatering and Root Rot

While not the flies themselves, excessive moisture causes the organic substrate to decompose rapidly, attracting scavengers. This anaerobic environment can also lead to soft, blackening roots in Calathea makoyana.

Very Common

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How to confirm: Gently lift the plant from its pot to check if the root system is mushy or smells of decay.

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1 Immediately inspect the roots for soft, black, or mushy textures and prune away any decayed sections using sterilized tools.

2 Repot the plant in a fresh, well-draining medium like a mix of organic potting soil and perlite to improve aeration and prevent future rot.

3 Deploy yellow sticky traps to capture the adult fungus gnats and reduce the fly population around the soil surface.

Super Ninja Fungus Gnat Traps - 30 Pack

30 pcs

In Stock

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Saprophagous Insects (Scavengers)

Small flies may be present to feed on the decomposing organic matter found in peat-based potting mixes common for Calatheas. They are attracted to the nutrient-rich, damp environment of a well-maintained Peacock Plant.

Common

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How to confirm: Inspect the top inch of soil for any visible movement or tiny larvae near decaying leaf fragments.

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1 Apply a biological control method to eliminate the flies and their larvae in the soil by using a targeted spray.