Onion Precorio F1 Brown Leaf Tips - Causes & Fixes

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Nitrogen Deficiency

Nitrogen is a mobile nutrient in onions; when levels are low, the plant relocates nitrogen from older leaves to new growth, causing the tips of the oldest leaves to turn brown and die back.

Very Common

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How to confirm: Check if the browning started on the oldest, outermost leaves while the center remains green.

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shopping_cart Recommended Products

1 Apply a nitrogen-rich organic fertilizer to the soil to replenish mobile nutrient levels and stop the progression of leaf die-back.

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

Organic Fertilizer

$40

Out of Stock

2 Monitor the soil moisture levels using a moisture meter to ensure the nitrogen is being effectively transported to the roots without causing waterlogging.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

3 Ensure the onion is planted in a nutrient-dense medium, such as a mix containing worm castings, to provide long-term nitrogen availability.

Back to the Roots Organic Worm Castings 5lb

Worm Castings

$17

In Stock

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Salt Accumulation (Salinity Stress)

Excessive buildup of fertilizer salts or high chloride levels in irrigation water causes osmotic stress, leading to tip burn specifically in salt-sensitive onion varieties like Precorio F1.

Very Common

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How to confirm: Inspect the soil surface for a white, crusty residue and check if symptoms appeared after recent heavy fertilization.

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1 Flush the soil thoroughly with large amounts of fresh, low-salt water to leach accumulated mineral salts away from the root zone.

2 Monitor soil moisture levels closely to ensure the leaching process does not lead to waterlogging, using a moisture meter for precision.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

3 Adjust your fertilization routine by using diluted liquid nutrients and avoid over-applying concentrated salts.

FoxFarm Bush Doctor Kelp Me Kelp You Liquid Seaweed Fertilizer 1 Quart

0.9 L • 1 pcs

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Water Stress (Drought or Fluctuating Moisture)

Onions require consistent moisture to develop bulb size; rapid transitions from saturated soil to drought conditions cause the leaf tips to desiccate and turn brown.

Common

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How to confirm: Check if the soil depth 2-3 inches below the surface feels dry and brittle during peak daylight hours.

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1 Ensure the soil remains consistently moist but not waterlogged by monitoring moisture levels with a meter to avoid the drying-out cycles that cause tip burn.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

2 Apply a consistent watering schedule and consider using a mulch or organic matter to help regulate soil moisture and prevent rapid evaporation.

Back to the Roots Organic Worm Castings 5lb

Worm Castings

$17

In Stock

3 If the soil has become hydrophobic or extremely dry, use a watering can with a fine spray to gently rehydrate the root zone without causing erosion.

Chapin 48000 0.5G Watering Can

2.3 L • Recycled Plastic

$12

In Stock

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Ascochyta Blight (Ascochyta campicola)

This fungal pathogen can cause necrotic lesions that begin at the leaf tips and move downward, often appearing as brown, withered areas in humid conditions.

Common

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How to confirm: Look for small, dark-colored spots or lesions along the edges of the brown areas on the leaves.

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shopping_cart Recommended Products

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

2 Apply a copper-based fungicide to the remaining healthy foliage to control the spread of the blight.