Hippeastrum Red Lion Tiny Black Flies - Causes & Fixes

Jump to cause: Fungus Gnats Excessive Soil Moisture Over-fertilization with Nitrogen

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Fungus Gnats

These small black flies breed in the moist organic matter of the top layer of soil. Their larvae feed on organic material and can occasionally damage the fine root hairs of your Hippeastrum, leading to reduced vigor.

Very Common

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How to confirm: Perform the 'sticky trap test' by placing a yellow sticky card near the soil surface to see if small flies 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

$7

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2 Allow the top inch of soil to dry out completely between waterings to make the environment less hospitable for larvae.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

3 Top-dress the soil with a layer of horticultural perlite to create a dry barrier that prevents adults from reaching the moist organic matter.

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Excessive Soil Moisture

Hippeastrum bulbs are highly susceptible to rot if the medium remains saturated. Constant moisture creates the perfect breeding ground for fungus gnat larvae and promotes fungal pathogens in the bulb scales.

Very Common

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How to confirm: Insert a wooden skewer deep into the pot; if it comes out dark and damp, your watering frequency is too high.

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

GROWIT Soil Moisture Meter SMM-V3

Water Meters

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2 Apply yellow sticky traps near the soil surface to capture adult flies and prevent further breeding.

Super Ninja Fungus Gnat Traps - 30 Pack

30 pcs

$7

In Stock

3 Repot the Amaryllis in a well-draining medium, incorporating perlite to improve aeration and prevent future moisture retention.

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Over-fertilization with Nitrogen

Excessive nitrogen promotes lush, tender new growth on the Amaryllis, which is highly attractive to flying insects. This soft tissue provides an easy food source for many small dipteran species.

Common

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How to confirm: Check if you have recently applied a high-nitrogen liquid fertilizer or if the plant is showing rapid, soft green growth.

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1 Apply organic insecticide to eliminate the adult flies and larvae in the soil.