Citrus hystrix Sudden Leaf Drop - Causes & Fixes

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Root Rot (Phytophthora spp.)

Citrus hystrix is highly sensitive to waterlogged soil; excessive moisture promotes Phytophthora species which attack the root system, leading to a sudden inability to support foliage.

Very Common

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How to confirm: Inspect the base of the stem and roots for dark, slimy, or foul-smelling tissue.

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1 Immediately inspect the roots for mushy, dark brown, or foul-smelling decay and prune away any dead tissue using sterilized tools.

2 Repot the plant in a well-draining, fresh medium and incorporate perlite to improve aeration and prevent future waterlogging.

3 Switch to a more porous container with excellent drainage and use a moisture meter to ensure the soil is allowed to dry out between waterings.

GROWIT Analog Soil Moisture Meter

Water Meters

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Environmental Stress (Temperature/Wind Shock)

Rapid fluctuations in temperature or exposure to cold drafts can trigger a defensive mechanism in Makrut lime trees, causing them to shed leaves to conserve moisture.

Very Common

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How to confirm: Check if the plant was recently moved or exposed to temperatures below 50°F (10°C).

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1 Move the plant to a stable, draft-free environment away from air conditioning vents, heaters, or cold windows to prevent further temperature fluctuations.

2 Monitor soil moisture levels closely using a moisture meter to ensure the plant is not experiencing root stress from overwatering during this period of reduced foliage.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

3 Apply a liquid seaweed fertilizer to help the tree recover from environmental shock and boost nutrient uptake for new growth.

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

0.9 L • 1 pcs

$32

In Stock

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Nutrient Deficiency (Nitrogen/Magnesium)

A sudden lack of mobile nutrients like Nitrogen can cause the tree to reallocate resources from older leaves to new growth, resulting in leaf senescence and drop.

Common

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How to confirm: Look for uniform yellowing of older leaves before they fall from the branch.

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

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

Organic Fertilizer

$40

Out of Stock

2 Supplement with a magnesium-rich fertilizer to address potential magnesium deficiencies and strengthen cell walls.

FoxFarm Bush Doctor Cal Mag Liquid Fertilizer 1 Gallon

3.8 L • Organic

$88

In Stock

3 Monitor soil moisture levels using an analog meter to ensure the tree is not experiencing water stress, which can mimic nutrient deficiency symptoms.

GROWIT Analog Soil Moisture Meter

Water Meters

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Citrus Leafminer (Phyllocnistis citrella)

While usually causing curling, heavy infestations can lead to significant foliage damage and secondary physiological stress that results in premature leaf drop.

Common

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How to confirm: Examine the leaves for silvery, serpentine tracks winding through the leaf tissue.

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1 Apply an organic insecticide to eliminate citrus leafminer larvae and protect new growth from further damage.