Lycopersicon esculentum Sudden Leaf Drop - Causes & Fixes

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Fusarium Wilt

This soil-borne fungus invades the vascular system of the tomato plant, blocking water transport. This leads to rapid yellowing and sudden wilting/dropping of leaves, often starting on one side of the plant.

Very Common

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How to confirm: Cut a cross-section of the main stem to check for characteristic brown necrotic vascular discoloration.

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1 Immediately remove and destroy the infected plant and all surrounding debris to prevent the soil-borne fungus from spreading to healthy plants.

2 Sterilize all gardening tools, such as your pruning shears, with alcohol or a disinfectant to avoid cross-contamination.

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3 Avoid planting tomatoes or other susceptible nightshades in this soil for at least two to three years, and consider amending the area with organic matter like worm castings to improve soil health.

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Environmental Stress (Temperature Fluctuations)

Tomato plants are highly sensitive to sudden drops in temperature or extreme heat spikes. Rapid changes can trigger an abscission response where the plant sheds leaves to conserve energy and moisture.

Very Common

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How to confirm: Review recent weather data for frost events or periods of extreme heat exceeding 90°F (32°C).

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1 Stabilize the plant's environment by moving it to a sheltered location or using a greenhouse cover to protect it from further temperature swings.

2 Apply a microbial-based fertilizer to help the plant recover from environmental stress and support root zone development.

FoxFarm Bush Doctor Boomerang Liquid Plant Fertilizer 1 Pint

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3 Monitor soil moisture levels closely to ensure the plant remains hydrated without becoming waterlogged during this recovery phase.

GROWIT Soil Moisture Meter - Blue

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Water Stress (Drought or Waterlogging)

Inconsistent moisture levels cause the plant to enter survival mode. Severe drought leads to leaf drop to reduce transpiration, while waterlogged soil causes root asphyxiation and subsequent leaf shedding.

Very Common

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How to confirm: Insert your finger 2 inches into the soil to determine if it is bone-dry or saturated/muddy.

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1 Check the soil moisture level immediately using a moisture meter to determine if the soil is bone-dry or saturated.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

2 If the soil is waterlogged, repot the tomato plant in a well-draining medium like Espoma Organic Potting Soil Mix to prevent root rot.

Espoma Organic Potting Soil Mix

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3 If the soil is dry, implement a consistent watering schedule and consider adding perlite to the soil to improve aeration and moisture retention.

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Bacterial Wilt (Ralstonia solanacearum)

This pathogen causes a sudden collapse of the plant's vascular tissue. The leaves may appear healthy for a brief moment before wilting and dropping rapidly due to blocked xylem.

Common

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How to confirm: Cut a wilted stem and place it in a clear glass of water to see if milky bacterial ooze emerges from the vessels.

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shopping_cart Recommended Products

1 Immediately remove and destroy the infected plant and all surrounding debris to prevent the bacteria from spreading to healthy tomatoes via soil or water.

2 Sterilize all gardening tools, such as your pruning shears, with alcohol or a bleach solution to avoid cross-contamination.

Fiskars 5/8" Bypass Pruning Shears

Cutting Tools

$13

In Stock

3 For future plantings, ensure excellent soil drainage by amending your garden beds with organic perlite to prevent the waterlogged conditions that favor bacterial spread.