Solanum tuberosum Yellow Leaves - Causes & Fixes

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Late Blight (Phytophthora infestans)

This oomycete pathogen causes rapid foliage discoloration, often starting as dark water-soaked spots that turn yellow and necrotic. In humid conditions, it can quickly destroy entire potato fields.

Very Common

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How to confirm: Look for a white, fuzzy mold growth on the undersides of the yellowing leaves during damp weather.

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1 Immediately remove and destroy all infected foliage and tubers to prevent the pathogen from spreading to healthy plants or surviving in the soil.

2 Apply an organic fungicide to protect remaining healthy tissue and manage the spread of the oomycete.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

3 Improve air circulation and reduce humidity around the plants by spacing them properly and avoiding overhead watering.

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Nitrogen Deficiency

Nitrogen is a mobile nutrient; when lacking, the plant moves it from older leaves to new growth. This results in uniform chlorosis (yellowing) starting with the bottom-most mature leaves.

Very Common

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How to confirm: Check if the yellowing pattern is progressing uniformly from the oldest leaves toward the top of the plant.

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shopping_cart Recommended Products

1 Apply a nitrogen-rich organic fertilizer to replenish the soil nutrients and stop the yellowing of older leaves.

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

Organic Fertilizer

$40

Out of Stock

2 Supplement with a balanced liquid fertilizer to ensure rapid nutrient uptake for the developing tubers.

FoxFarm Grow Big Liquid Plant Food 1 Quart

0.9 L • 1 pcs

$30

In Stock

3 Monitor soil moisture levels using a moisture meter to ensure nitrogen is being delivered effectively to the root zone without causing waterlogging.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

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Potato Virus Y (PVY)

Commonly spread by aphids, PVY causes mosaic patterns, mottling, and leaf yellowing. It can also lead to stunted growth and deformed tubers in Solanum tuberosum.

Common

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How to confirm: Observe the leaves for irregular light-green or yellow patches (mosaics) rather than uniform yellowing.

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shopping_cart Recommended Products

1 Immediately remove and destroy all infected potato plants to prevent the virus from spreading to healthy crops via contact or insect vectors.

2 Monitor and control aphid populations using an organic insecticide to stop the primary transmission method of the virus.

Bonide Captain Jack's Deadbug Brew 16 oz

0.5 L • Organic

$15

In Stock

3 Apply a nutrient boost to help remaining healthy plants recover from environmental stress and maintain vigor.

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

0.9 L • 1 pcs

$32

In Stock

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Overwatering and Root Rot

Excessive soil moisture deprives potato roots of oxygen, leading to physiological stress. This disruption in nutrient uptake causes the foliage to lose chlorophyll and turn yellow.

Common

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How to confirm: Check the soil moisture levels at a depth of 2 inches and inspect if the stems feel soft or mushy.

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1 Immediately reduce watering frequency and allow the top inch of soil to dry out completely before watering again to restore oxygen to the root zone.