Cucumis sativus Bon Odori F1 Tiny Black Flies - Causes & Fixes

search Possible Causes

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Fungus Gnats (Sciarid Flies)

The larvae of these flies live in the upper layers of moist soil and feed on organic matter and fine root hairs of the cucumber plant. Their presence is a strong indicator that the growing medium is excessively damp, which can lead to secondary root rot in Bon Odori varieties.

Very Common

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How to confirm: Place a yellow sticky trap near the base of the cucumber plant to confirm adult fly presence.

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shopping_cart Recommended Products

1 Apply a biological control method to eliminate adult flies and larvae; use yellow sticky traps to capture flying adults.

Super Ninja Fungus Gnat Traps - 30 Pack

30 pcs

In Stock

2 Reduce watering frequency to allow the top layer of soil to dry out, as excessive moisture is the primary cause of fungus gnat breeding.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

3 Refresh the top layer of the growing medium with a drier substrate like perlite to disrupt the larvae's habitat.

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Cucumber Beetle (Striped or Spotted)

Some species of small, dark beetles are attracted to the lush foliage of Cucumis sativus. While adults feed on leaves, they can also introduce bacterial wilt, which is devastating to cucumber cultivars.

Common

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How to confirm: Inspect the undersides of the leaves for small, dark insects actively feeding on leaf tissue.

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1 Apply an organic insecticide to eliminate adult beetles and prevent them from spreading bacterial wilt to the rest of your cucumber plants.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Use yellow sticky traps to capture flying adults and monitor the population levels in your cucumber patch.

Super Ninja Fungus Gnat Traps - 30 Pack

30 pcs

In Stock

3 Inspect the leaves for feeding damage and remove any heavily infested foliage to reduce the beetle's breeding ground.

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Black Bean Aphids

While typically more sedentary, certain small, dark aphid species can be mistaken for flies from a distance. They cluster on new growth and can cause the leaves of the Bon Odori cucumber to curl or become stunted.

Common

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How to confirm: Check the tender new shoots and leaf undersides for tiny, stationary dark clusters.

build How to fix it

shopping_cart Recommended Products

1 Apply an organic insecticide spray to eliminate the aphid population on new growth and stems.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Place yellow sticky traps near the plant to capture any flying adults and monitor for further infestations.

Super Ninja Fungus Gnat Traps - 30 Pack