Calathea orbifolia Tiny Black Flies - Causes & Fixes

Jump to cause: Fungus Gnats (Sciarid Flies) Overwatering and Soil Aeration Issues Decaying Organic Matter

search Possible Causes

error

Fungus Gnats (Sciarid Flies)

The presence of tiny black flies around the soil surface of a Calathea orbifolia almost always indicates fungus gnats. Their larvae live in the top layer of organic matter and feed on decaying plant material and fungal mycelium.

Very Common

lightbulb

How to confirm: Place a yellow sticky trap near the plant to see if small, dark-colored insects are captured.

build How to fix it

shopping_cart Recommended Products

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

Super Ninja Fungus Gnat Traps - 30 Pack

30 pcs

$7

In Stock

2 Allow the top inch of soil to dry out completely between waterings to disrupt the larvae's moist habitat.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

3 Apply a microbial-based treatment or organic insecticide to target the larvae living in the organic matter.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

error

Overwatering and Soil Aeration Issues

Fungus gnat populations explode when Calathea orbifolia soil remains consistently wet. High humidity and high moisture levels required by this species can inadvertently create the perfect breeding ground for larvae in the topsoil.

Very Common

lightbulb

How to confirm: Stick your finger two inches deep into the soil to check if it is staying damp for too long between waterings.

build How to fix it

shopping_cart Recommended Products

1 Reduce watering frequency and allow the top inch of soil to dry out completely to disrupt the fungus gnat breeding cycle.

GROWIT Soil Moisture Meter SMM-V3

Water Meters

—

2 Apply a biological control like Bonide Captain Jack's Neem Oil to target the larvae and adult flies.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

3 Repot the plant in a well-aerated medium by mixing in horticultural perlite to improve drainage and prevent future soil compaction.

warning

Decaying Organic Matter

If there are dead, fallen leaves from the orbifolia sitting on the soil surface, they provide a primary food source and breeding site for flies. These decomposing tissues attract scavengers that complete their life cycle in the potting mix.

Common

lightbulb

How to confirm: Remove any brown or decaying foliage from the base of the plant and inspect the soil surface.

build How to fix it

shopping_cart Recommended Products

1 Remove all dead, decaying leaves and organic debris from the soil surface to eliminate the primary breeding site for the flies.

2 Apply a biological control like Bonide Captain Jack's Neem Oil to treat the larvae and adults, and use yellow sticky traps to capture flying adults.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

3 Monitor the soil moisture levels closely with a moisture meter to ensure the top layer of soil is not staying too damp, which prevents further organic decay.

GROWIT Soil Moisture Meter SMM-V3

Water Meters

—