Red Cabbage Ruby Perfection F1 Tiny Black Flies - Causes & Fixes

Jump to cause: Fungus Gnats (Sciaridae) Blackberry/Leafminers (Agromyza spp.) Fruit Flies (Drosophilidae)

search Possible Causes

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Fungus Gnats (Sciaridae)

The larvae of these flies live in the soil and feed on organic matter or fine root hairs. In cabbage crops, they can cause secondary damage by weakening the root system of the developing head.

Very Common

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How to confirm: Place a yellow sticky trap near the base of the cabbage plant to see if small, dark-bodied flies are captured.

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shopping_cart Recommended Products

1 Deploy yellow sticky traps to capture the adult flying gnats and break the reproductive cycle.

Super Ninja Fungus Gnat Traps - 30 Pack

30 pcs

$7

In Stock

2 Reduce watering frequency and allow the top inch of soil to dry out to eliminate the moist environment required for larvae survival.

GROWIT Soil Moisture Meter SMM-V3

Water Meters

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3 Apply a microbial-based soil drench to target the larvae living in the organic matter of the soil.

FoxFarm Bush Doctor Microbe Brew 1 Gallon

3.8 L

$115

In Stock

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Blackberry/Leafminers (Agromyza spp.)

While often characterized by trails on leaves, certain small flies lay eggs that result in larvae consuming the cabbage tissue. This can lead to localized necrosis and attract more opportunistic pests.

Common

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How to confirm: Inspect the underside of the cabbage leaves for tiny serpentine tunnels or small exit holes.

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1 Apply an organic insecticide spray to eliminate the adult flies and prevent further egg-laying on cabbage leaves.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Use yellow sticky traps near the plant to capture and monitor the adult fly population.

Super Ninja Fungus Gnat Traps - 30 Pack

30 pcs

$7

In Stock

3 Inspect leaves for larvae trails and manually remove or prune heavily damaged tissue to reduce the attraction of secondary pests.

warning

Fruit Flies (Drosophilidae)

If the Ruby Perfection cabbage has any cracked or decaying outer leaves due to high moisture, fruit flies will be attracted to the fermenting organic matter.

Common

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How to confirm: Check for soft, mushy, or decaying patches on the outer leaves of the cabbage head.

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shopping_cart Recommended Products

1 Remove and discard any cracked, decaying, or fermenting outer leaves to eliminate the primary breeding site for the flies.

2 Deploy yellow sticky traps near the base of the plant to capture adult flies and monitor the infestation level.

Super Ninja Fungus Gnat Traps - 30 Pack

30 pcs

$7

In Stock

3 Adjust watering frequency to ensure the soil surface stays dry, preventing the high moisture levels that attract fruit flies.