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Cymbidium cyperifolium Tiny Black Flies
eco Tiny Black Flies

Cymbidium cyperifolium – Tiny Black Flies

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

yard View full Cymbidium cyperifolium care guide
Jump to cause: Fungus Gnats (Sciarid Flies) Sapromyiid Flies (Carrion/Decay Flies) Drain Fly Larvae infestation

search Possible Causes

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Fungus Gnats (Sciarid Flies)

The larvae of fungus gnats live in the upper layers of the substrate and feed on organic matter and fungal mycelium. In Cymbidium species, high moisture levels in the medium provide the perfect breeding ground for these flies.

Very Common
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How to confirm: Place a yellow sticky trap near the orchid pot to see if small flying insects are captured.
build How to fix it
shopping_cart Recommended Products
1 Deploy yellow sticky traps to capture the adult flying gnats and break the breeding cycle.
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 top layer of the substrate to dry out to eliminate the moist environment larvae need to survive.
GROWIT Soil Moisture Meter - Blue
GROWIT Soil Moisture Meter - Blue
Water Meters
$12
In Stock
3 Top-dress the orchid with a layer of inorganic material like perlite or LECA to create a dry barrier that prevents adults from laying eggs in the organic medium.
Legigo Perlite 8qt
Legigo Perlite 8qt
7.6 L • Perlite
$19
In Stock
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Sapromyiid Flies (Carrion/Decay Flies)

These flies are attracted to decomposing organic matter. If the Cymbidium substrate has developed anaerobic pockets or rotting pseudobulbs, these flies will lay eggs in the decaying tissue.

Common
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How to confirm: Gently lift the medium to check for any mushy, black, or foul-smelling decomposing rhizomes.
build How to fix it
shopping_cart Recommended Products
1 Inspect the orchid substrate and pseudobulbs for any signs of rot, mushy tissue, or anaerobic pockets, and carefully prune away any decaying organic matter.
2 Repot the plant in fresh, well-draining orchid substrate to eliminate the breeding ground for the flies.
Better-Gro Orchid Bark 4Qt (2-Pack)
Better-Gro Orchid Bark 4Qt (2-Pack)
Orchid Bark
$5
In Stock
3 Apply a biological control method to target any remaining larvae or flies in the environment.
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
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Drain Fly Larvae infestation

While less common on orchids, if the pot is kept in a very humid environment or sits in a saucer with stagnant water, drain flies can emerge. They thrive in the biofilm created by organic buildup in orchid drainage trays.

Common
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How to confirm: Inspect the drainage saucer for any standing water or slimy film buildup.
build How to fix it
shopping_cart Recommended Products
1 Clean the drainage area and remove any stagnant water from the plant saucer to disrupt the fly's breeding environment.
Bleuhome 6-Pack 6in Plant Saucers Black
Bleuhome 6-Pack 6in Plant Saucers Black
Pot Saucers
$6
In Stock
2 Apply an organic insecticide spray to the soil surface and surrounding area to target any remaining larvae or adult flies.
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 Ensure the orchid substrate is well-draining and avoid overwatering to prevent the organic biofilm buildup that attracts drain flies.
Better-Gro Orchid Bark 4Qt (2-Pack)
Better-Gro Orchid Bark 4Qt (2-Pack)
Orchid Bark
$5
In Stock

Other Cymbidium cyperifolium problems

Your plant might also be experiencing one of these issues:

eco White Powder chevron_right
local_hospital All symptoms eco All plants with tiny black flies
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