Onion Yellow Stone F1 Drooping Leaves - Causes & Fixes

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Water Stress (Drought or Waterlogging)

Onions have shallow root systems and are highly sensitive to moisture fluctuations. Extreme dry periods cause cellular loss of turgor, while waterlogged soil leads to hypoxia, suffocating the roots and causing leaves to wilt.

Very Common

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How to confirm: Insert your finger 2 inches into the soil; if it is bone dry or muddy/saturated, you have a watering issue.

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1 Check the soil moisture level at the root zone using a moisture meter to determine if the soil is bone dry or saturated.

GROWIT Soil Moisture Meter SMM-V3

Water Meters

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2 If the soil is dry, water the onion beds thoroughly to restore turgor pressure; if waterlogged, improve drainage by adding perlite or horticultural sand to the soil.

3 Ensure the planting area has excellent drainage to prevent future hypoxia and root suffocation.

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Onion Leek Blight (Peronospora destructor)

This fungal pathogen causes leaves to wilt and eventually collapse, often preceded by water-soaked patches or purplish discolorations on the leaf edges.

Common

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How to confirm: Inspect the underside of the drooping leaves for any fine, greyish fungal growth or mold.

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1 Remove and destroy all infected plant material immediately to prevent the fungal spores from spreading to healthy onions.

2 Apply an organic fungicide to the remaining healthy plants to control the spread of the blight.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

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3 Improve air circulation and avoid overhead watering to ensure the leaves stay dry, reducing the humidity that promotes fungal growth.

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Nutrient Deficiency (Nitrogen)

A lack of nitrogen prevents the onion from maintaining structural integrity and chlorophyll production, leading to limp, pale yellowing leaves that droop over time.

Common

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How to confirm: Check if the drooping is accompanied by a uniform yellowing starting from the older, lower leaves.

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1 Apply a nitrogen-rich organic fertilizer to boost chlorophyll production and leaf strength.

Back to the Roots Blood Meal & Gypsum (4 Pack)

Organic Fertilizer

$40

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2 Monitor soil moisture levels with a meter to ensure nitrogen is being effectively absorbed by the roots.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

3 Ensure the plant is receiving adequate sunlight to support the metabolic processes required for nutrient uptake.

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Onion Maggot Infestation (Delia antiqua)

Larvae of the onion maggot tunnel through the basal plates and roots, physically destroying the plant's ability to transport water and nutrients to the foliage.

Common

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How to confirm: Gently pull the plant from the soil to check for small, white larvae near the bulb or root base.

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1 Inspect the base of the onion plants for larvae or tunneling; if found, remove and destroy the infested plants immediately to prevent spread.

2 Apply an organic insecticide to target any remaining larvae or pests in the soil area.