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Dendrobium aggregatum Tiny Black Flies
eco Tiny Black Flies

Dendrobium aggregatum – Tiny Black Flies

Why does your Dendrobium aggregatum have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.

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Jump to cause: Fungus Gnats Sapromyiid Flies (Fruit/Decay Flies) Sciarid Flies

search Possible Causes

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Fungus Gnats

The larvae of these flies live in the organic matter of the potting medium, feeding on decaying roots and fungi. In Dendrobium aggregatum, high moisture levels in the substrate encourage their lifecycle, often leading to secondary root rot.

Very Common
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How to confirm: Place a yellow sticky trap near the orchid pot to see if small black flies are attracted to it.
build How to fix it
shopping_cart Recommended Products
1 Apply a biological control to eliminate the adult flies and larvae; use a yellow sticky trap to capture flying adults.
Super Ninja Fungus Gnat Traps - 30 Pack
Super Ninja Fungus Gnat Traps - 30 Pack
30 pcs
$7
In Stock
2 Reduce watering frequency and allow the substrate to dry out more between sessions to disrupt the larvae's moist habitat.
GROWIT Soil Moisture Meter - Blue
GROWIT Soil Moisture Meter - Blue
Water Meters
$12
In Stock
3 Repot the orchid in a well-draining medium like orchid bark to improve aeration and reduce organic decay.
Better-Gro Orchid Bark 4Qt (2-Pack)
Better-Gro Orchid Bark 4Qt (2-Pack)
Orchid Bark
$5
In Stock
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Sapromyiid Flies (Fruit/Decay Flies)

These flies are attracted to the fermenting organic matter or rotting pseudobulbs of the Dendrobium. If old, decaying canes are present in the clump, they serve as a primary breeding ground.

Common
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How to confirm: Inspect the base of the plant for any mushy, blackened, or decomposing old pseudobulbs.
build How to fix it
shopping_cart Recommended Products
1 Inspect the plant for any decaying or rotting pseudobulbs and use sterilized shears to prune away all dead organic matter to remove the breeding site.
2 Apply an organic insecticide spray to the plant and surrounding area to eliminate adult flies and larvae.
Bonide Captain Jack's Neem Oil 32 oz
Bonide Captain Jack's Neem Oil 32 oz
0.9 L • 1 pcs • Organic
$10
In Stock
3 Set up yellow sticky traps near the plant to capture remaining flying adults and monitor the infestation level.
Super Ninja Fungus Gnat Traps - 30 Pack
Super Ninja Fungus Gnat Traps - 30 Pack
30 pcs
$7
In Stock
warning

Sciarid Flies

Similar to fungus gnats, these flies thrive in the overly damp, decomposing bark/sphagnum moss used for epiphytic orchids. They target the moist crevices of the Dendrobium's rhizome and root mass.

Common
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How to confirm: Check if the potting medium is staying wet for much longer than the typical drying cycle for this species.
build How to fix it
shopping_cart Recommended Products
1 Reduce watering frequency and allow the orchid substrate to dry out more between waterings to disrupt the life cycle of the flies.
GROWIT Soil Moisture Meter SMM-V3
GROWIT Soil Moisture Meter SMM-V3
Water Meters
—
2 Deploy yellow sticky traps near the plant to capture adult flies and prevent further egg-laying in the substrate.
Super Ninja Fungus Gnat Traps - 30 Pack
Super Ninja Fungus Gnat Traps - 30 Pack
30 pcs
$7
In Stock
3 Repot the orchid using fresh, well-draining orchid bark to remove the damp, decomposing organic matter that serves as a breeding ground.
Better-Gro Orchid Bark 4Qt (2-Pack)
Better-Gro Orchid Bark 4Qt (2-Pack)
Orchid Bark
$5
In Stock

Other Dendrobium aggregatum problems

Your plant might also be experiencing one of these issues:

eco Sticky Leaves chevron_right
local_hospital All symptoms eco All plants with tiny black flies
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