Tomato Master No. 2 F1 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 and nutrient transport. It typically causes progressive yellowing and sudden wilting/dropping of lower leaves.

Very Common

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How to confirm: Cut a stem near the base and check if the internal vascular tissue is distinctly brown rather than green.

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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 further transmission of the pathogen.

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3 Avoid planting tomatoes or related nightshades in this soil for several years, or amend the area with organic matter like worm castings to improve soil health.

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Water Stress (Fluctuating Moisture)

Rapid shifts between extreme drought and heavy saturation cause the tomato plant to enter survival mode, shedding leaves to reduce transpiration. This is particularly common in hybrid varieties like Master No. 2 during heatwaves.

Very Common

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How to confirm: Check if the soil surface is bone dry or if there has been significant recent rainfall/overwatering.

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1 Stabilize the moisture levels by checking the soil depth before watering; use a moisture meter to ensure the soil remains consistently damp but not waterlogged.

GROWIT Soil Moisture Meter - Blue

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2 Apply a mulch layer or organic amendment like worm castings to help the soil retain moisture and buffer against rapid drying during heatwaves.

Back to the Roots Organic Worm Castings 5lb

Worm Castings

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3 Ensure the plant is in a container with excellent drainage and consider using a saucer to catch excess water and prevent the roots from sitting in stagnant liquid.

Bleuhome 10" Plant Saucer 6-Pack Black

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Bacterial Wilt (Ralstonia solanacearum)

A highly aggressive bacterium that causes rapid collapse of the plant tissue. Unlike fungal wilts, the leaf drop and wilting can happen almost overnight.

Common

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

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

2 Sterilize all gardening tools, such as pruning shears, with a 10% bleach solution or alcohol after use to avoid cross-contamination.

Fiskars 5/8" Bypass Pruning Shears

Cutting Tools

$13

In Stock

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

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Phytophthora Blight

This oomycete attacks the stems and leaves, especially in humid conditions. It can cause rapid necrosis of foliage, leading to premature leaf abscission.

Common

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How to confirm: Inspect the lower stems for dark, water-soaked lesions that extend upward toward the leaves.

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1 Remove and destroy all infected foliage and debris immediately to prevent the spread of the pathogen, ensuring you do not compost the diseased material.

2 Apply an organic fungicide to protect healthy plant tissues from further infection.