Citrus aurantiifolia Sudden Leaf Drop - Causes & Fixes

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Root Rot (Phytophthora spp.)

Overwatering or poorly draining soil creates anaerobic conditions that promote Phytophthora, a common pathogen in citrus. This fungal infection damages the fine feeder roots, causing the tree to shed leaves rapidly as it loses the ability to transport water.

Very Common

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How to confirm: Inspect the base of the trunk for dark, water-soaked lesions and check if the soil remains saturated for long periods.

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1 Immediately reduce watering frequency and ensure the plant is in a container with excellent drainage to stop the spread of Phytophthora.

2 Repot the tree in a well-draining, airy medium by mixing existing soil with horticultural perlite to improve oxygen levels at the root zone.

3 Apply a fungicide treatment to the soil to combat the pathogen and use a liquid seaweed fertilizer to help the tree recover from the stress of root damage.

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

0.9 L • 1 pcs

$32

In Stock

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Extreme Temperature Stress (Cold Shock)

Key limes are highly sensitive to frost and temperatures below 50°F (10°C). A sudden drop in temperature triggers a physiological defense mechanism where the tree sheds foliage to reduce transpiration and protect its core.

Very Common

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How to confirm: Check local weather history for recent frost events or overnight temperature drops below freezing.

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1 Immediately move the plant to a warmer environment or protect it from frost using a frost blanket or greenhouse cover to prevent further temperature fluctuations.

2 Apply a liquid seaweed fertilizer to help the tree recover from environmental stress and boost nutrient uptake during this sensitive period.

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

0.9 L • 1 pcs

$32

In Stock

3 Monitor soil moisture closely to ensure the roots are not sitting in water, as cold, wet soil can exacerbate temperature-induced stress.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

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Water Stress (Drought)

Rapid leaf drop is a common response to significant moisture deficits in citrus trees. When the soil dries out completely, the tree enters a state of dormancy-like defense by shedding leaves to prevent further desiccation.

Common

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How to confirm: Check the depth of the soil moisture; if it is bone dry several inches below the surface, the tree is likely dehydrated.

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1 Immediately check the soil moisture level at the root zone to confirm the extent of the drought.

GROWIT Soil Moisture Meter - Teal

Water Meters

$12

In Stock

2 Apply a deep, thorough watering to the base of the tree to rehydrate the root system, ensuring the water reaches deep into the soil.

Chapin 48000 0.5G Watering Can

2.3 L • Recycled Plastic

$12

In Stock

3 Apply a specialized fertilizer like FoxFarm Happy Frog Citrus and Avocado Fertilizer to help the tree recover from the stress and support new growth.

FoxFarm Happy Frog Citrus and Avocado Fertilizer

1 pcs • Organic

$21

In Stock

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Citrus Canker (Xanthomonas citri)

While often characterized by lesions, severe bacterial infections can cause significant defoliation in susceptible lime varieties. The pathogen disrupts the leaf tissue, leading to premature senescence and drop.

Common

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How to confirm: Examine the remaining leaves for raised, corky, brown lesions surrounded by a yellow halo.

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1 Prune and remove all infected or heavily symptomatic leaves and branches immediately using sterilized tools to prevent the spread of bacteria.