Problems

Tomato Problems: Causes & Quick Fixes

Quick answer

Tomato is prone to 16 common issues - each link below is a plant-specific fix guide.

Tomato houseplant

Tomato problems

Use the guides below to diagnose and fix common issues on Tomato. Each problem page explains why it happens on this species and what to do first.

Or use our problem diagnosis tool to narrow down symptoms.

Common problems on Tomato

Yellow Leaves

Medium

Likely cause: Common on this plant type; confirm with recent watering, light, and root checks.

Quick fix: Inspect the plant and correct the most likely care stressor before stacking treatments.

Full fix guide →

Brown Tips

Medium

Likely cause: Common on this plant type; confirm with recent watering, light, and root checks.

Quick fix: Inspect the plant and correct the most likely care stressor before stacking treatments.

Full fix guide →

Root Rot

Medium

Likely cause: Common on this plant type; confirm with recent watering, light, and root checks.

Quick fix: Inspect the plant and correct the most likely care stressor before stacking treatments.

Full fix guide →

Overwatering

Medium

Likely cause: Common on this plant type; confirm with recent watering, light, and root checks.

Quick fix: Inspect the plant and correct the most likely care stressor before stacking treatments.

Full fix guide →

Underwatering

Medium

Likely cause: Common on this plant type; confirm with recent watering, light, and root checks.

Quick fix: Inspect the plant and correct the most likely care stressor before stacking treatments.

Full fix guide →

Spider Mites

Medium

Likely cause: Common on this plant type; confirm with recent watering, light, and root checks.

Quick fix: Inspect the plant and correct the most likely care stressor before stacking treatments.

Full fix guide →

Mealybugs

Medium

Likely cause: Common on this plant type; confirm with recent watering, light, and root checks.

Quick fix: Inspect the plant and correct the most likely care stressor before stacking treatments.

Full fix guide →

Aphids

Medium

Likely cause: Common on this plant type; confirm with recent watering, light, and root checks.

Quick fix: Inspect the plant and correct the most likely care stressor before stacking treatments.

Full fix guide →

Leggy Growth

Medium

Likely cause: Common on this plant type; confirm with recent watering, light, and root checks.

Quick fix: Inspect the plant and correct the most likely care stressor before stacking treatments.

Full fix guide →

Slow Growth

Medium

Likely cause: Common on this plant type; confirm with recent watering, light, and root checks.

Quick fix: Inspect the plant and correct the most likely care stressor before stacking treatments.

Full fix guide →

Wilting

Medium

Likely cause: Common on this plant type; confirm with recent watering, light, and root checks.

Quick fix: Inspect the plant and correct the most likely care stressor before stacking treatments.

Full fix guide →

Drooping Leaves

Medium

Likely cause: Common on this plant type; confirm with recent watering, light, and root checks.

Quick fix: Inspect the plant and correct the most likely care stressor before stacking treatments.

Full fix guide →

Low Humidity

Medium

Likely cause: Common on this plant type; confirm with recent watering, light, and root checks.

Quick fix: Inspect the plant and correct the most likely care stressor before stacking treatments.

Full fix guide →

Not Enough Light

Medium

Likely cause: Common on this plant type; confirm with recent watering, light, and root checks.

Quick fix: Inspect the plant and correct the most likely care stressor before stacking treatments.

Full fix guide →

Fungus Gnats

Medium

Likely cause: Common on this plant type; confirm with recent watering, light, and root checks.

Quick fix: Inspect the plant and correct the most likely care stressor before stacking treatments.

Full fix guide →

Mold on Soil

Medium

Likely cause: Common on this plant type; confirm with recent watering, light, and root checks.

Quick fix: Inspect the plant and correct the most likely care stressor before stacking treatments.

Full fix guide →

Frequently asked questions

How often should I water Tomato?

Keep the root zone evenly moist while the plant is flowering and fruiting, but never saturated. Water deeply when the upper 2–3 cm of soil begins to dry, directing water at the soil rather than over the foliage. In practice, water check daily in hot weather; water when the upper 2–3 cm is dry. Test the soil below the surface and water deeply if it feels dry. Water more often during hot, windy weather and fruit development; reduce during cool or rainy periods.

What light does Tomato need?

Tomato needs bright, indirect light for steady indoor growth.

Is Tomato toxic to pets?

Tomato is toxic to cats, dogs, and horses. Keep out of reach of curious pets and choose pet-safe alternatives for accessible spots.

How do I propagate Tomato?

Propagate Tomato from healthy stem or root divisions during active growth.

What soil is best for Tomato?

Use fertile, moisture-retentive but well-drained loam or container mix rich in organic matter. A slightly acidic pH near 5.8–6.8 is preferred. A good mix includes 50% high-quality potting mix or loam, 30% mature compost, 20% perlite, pumice, or coarse material for drainage. Good drainage with steady moisture; avoid both standing water and repeated drought.

When should I repot Tomato?

Repot Tomato transplant seedlings once into their final bed or container; tomatoes are usually replaced after the crop, ideally in warm season, after frost risk has passed and nights are reliably mild. Signs it needs a bigger pot: seedling roots circle the nursery cell, growth stalls between waterings, the container is smaller than about 19 l for a full-size plant.

Why does my Tomato have yellow leaves?

Common on this plant type; confirm with recent watering, light, and root checks. Quick fix: Inspect the plant and correct the most likely care stressor before stacking treatments.

How this Tomato problems guide is reviewed?

Editorial policy Review board

Written by · Reviewed by LeafyPixels Review Board · Updated November 7, 2026

This Tomato problems problem guide was researched and written by . Problems symptoms on Tomato, lookalike causes, and step-by-step fixes are cross-checked against extension pest, disease, and care references before publication.

We prioritize sources that hold up under scrutiny:

University cooperative extension bulletins and fact sheets (Penn State, Clemson, UMD, NC State, and similar programs)
Botanical garden and horticultural society publications
Peer-reviewed plant science and veterinary toxicology references where pet safety matters (including ASPCA Animal Poison Control)
Established reference works on indoor plant culture

The LeafyPixels editorial team then reviews the draft for clarity, step-by-step usefulness, and fit with real apartment and home conditions-not ideal greenhouse setups. When guidance changes materially, we update the page and note the revision date.

Sources used

Ask Extension: Prayer Plant Mold (n.d.) Extension discussion of saprophytic surface fungi, prolonged wetness, removing visible growth, and replacing the surface layer.. [Online]. Available at: https://ask.extension.org/kb/faq.php?id=417183 (Accessed: 7 November 2026).
Ask Extension: White Material on Surface of Potting Soil (n.d.) A cautious example of saprophytic surface growth and the possibility that heavy growth can obstruct watering.. [Online]. Available at: https://ask.extension.org/kb/faq.php?id=213591 (Accessed: 7 November 2026).
Clemson University IPM Program — A Practical, Compatible Strategy for Greenhouse Mealybug Management (n.d.) Greenhouse integrated management and the need to account for effects of pesticide choices on biological controls. [Online]. Available at: https://blogs.clemson.edu/ipm/a-practical-compatible-strategy-for-greenhouse-mealybug-management/ (Accessed: 7 November 2026).
Colorado State University Extension: Spider Mites (n.d.) Dry conditions, stippling and webbing, natural enemies, water sprays, and insecticide-related flare-ups.. [Online]. Available at: https://extension.colostate.edu/resource/spider-mites/ (Accessed: 7 November 2026).
Cornell University Integrated Pest Management — Fungus Gnats (n.d.) Adult and larval identification, possible injury to tender roots and seedlings, and checking growing media for larvae.. [Online]. Available at: https://cals.cornell.edu/integrated-pest-management/outreach-education/whats-bugging-you/fungus-gnats (Accessed: 7 November 2026).
Cornell University Vegetable MD Online — Symptoms of Pythium on Tomato (n.d.) Tomato-specific Pythium symptom identification. [Online]. Available at: http://vegetablemdonline.ppath.cornell.edu/DiagnosticKeys/TomWlt/Pythium_Tom.htm (Accessed: 7 November 2026).
Epic Gardening — 7 Signs You're Overwatering Tomatoes and How to Save Them (n.d.) Practical differential: both too little and too much water can cause drooping, so check soil and watering history before acting.. [Online]. Available at: https://www.epicgardening.com/overwatering-tomatoes/ (Accessed: 7 November 2026).
Farm to Jar — Leggy Tomato Seedlings? Causes and Fixes (n.d.) Seedling legginess signs and contributing roles of light, crowding, warmth, and seed-starting timing. [Online]. Available at: https://farmtojar.com/leggy-tomato-seedlings/ (Accessed: 7 November 2026).
Frontiers in Plant Science: Adaptive responses of plants to light stress (n.d.) General plant physiology context for acclimation and light stress. [Online]. Available at: https://www.frontiersin.org/journals/plant-science/articles/10.3389/fpls.2025.1550125/full (Accessed: 7 November 2026).
Gardening Know How — When to Plant Tomatoes (n.d.) Warm-season timing, transplant establishment, and hardening off tomato seedlings. [Online]. Available at: https://www.gardeningknowhow.com/edible/vegetables/tomato/planting-time-for-tomatoes.htm (Accessed: 7 November 2026).
Gardening Know How: How Much Sun Do Tomato Plants Need? (n.d.) Daily direct-sun guidance and common low-light growth signs. [Online]. Available at: https://www.gardeningknowhow.com/edible/vegetables/tomato/how-much-sun-do-tomato-plants-need.htm (Accessed: 7 November 2026).
Gardenish — Why Tomato Leaves Look Scorched (n.d.) Practical comparison of weather exposure, watering history, damage direction, and new growth when assessing scorch.. [Online]. Available at: https://gardenish.co/learn/why-tomato-leaves-look-scorched/ (Accessed: 7 November 2026).
GrowVeg — Tomato Planting Masterclass: Get Your Plants Off to the Best Start (n.d.) Potting tomato seedlings deeper and the ability of tomato stems to form roots. [Online]. Available at: https://www.growveg.com/guides/tomato-planting-masterclass-get-your-plants-off-to-the-best-start/ (Accessed: 7 November 2026).
Homes & Gardens — How Much Water Do Tomato Plants Need? (n.d.) Practical tomato watering checks that account for plant size, growing conditions, and soil moisture rather than a universal schedule.. [Online]. Available at: https://www.homesandgardens.com/gardens/how-much-water-do-tomato-plants-need (Accessed: 7 November 2026).
N.C. Cooperative Extension, Carteret County — What Caused My Tomato Plant to Wilt? (n.d.) Tomato wilt differential, including water stress, viral disease, vascular wilts, bacterial wilt, and root-knot nematodes.. [Online]. Available at: https://carteret.ces.ncsu.edu/news/what-caused-my-tomato-plant-to-wilt/ (Accessed: 7 November 2026).
NC State Extension — Bacterial Wilt of Tomatoes (n.d.) Bacterial wilt clues, diagnostic caution, and removal guidance for confirmed infected plants.. [Online]. Available at: https://content.ces.ncsu.edu/bacterial-wilt-of-tomatoes (Accessed: 7 November 2026).
NC State Extension — Fusarium Wilt of Tomato (n.d.) Fusarium wilt symptom pattern and prevention through resistant varieties and rotation.. [Online]. Available at: https://content.ces.ncsu.edu/fusarium-wilt-of-tomato (Accessed: 7 November 2026).
NC State Extension — Tomato Diseases (n.d.) Tomato disease symptoms and diagnostic caution when foliage symptoms overlap with environmental stress.. [Online]. Available at: https://content.ces.ncsu.edu/tomato-diseases (Accessed: 7 November 2026).
NC State Extension Gardener Plant Toolbox: Tomato (n.d.) Tomato full-sun preference and species care context. [Online]. Available at: https://plants.ces.ncsu.edu/plants/solanum-lycopersicum/ (Accessed: 7 November 2026).
NC State Extension Plant Toolbox: Tomato (n.d.) Tomato container and soil context, full-sun culture, and the need for consistent soil moisture.. [Online]. Available at: https://plants.ces.ncsu.edu/plants/solanum-lycopersicum/common-name/tomato/ (Accessed: 7 November 2026).
NC State Extension: Growing Tomatoes in the Home Garden (n.d.) Choosing tomato varieties for available sunlight and home-garden growing context. [Online]. Available at: https://content.ces.ncsu.edu/growing-tomatoes-in-the-home-garden (Accessed: 7 November 2026).
Newsweek: What plants need to grow (n.d.) General photosynthesis context attributed to a plant biologist. [Online]. Available at: https://www.newsweek.com/what-plants-need-grow-sunlight-water-temperature-nutrients-1622783 (Accessed: 7 November 2026).
North Carolina State Extension — Tomato Spotted Wilt Virus on Tomato and Pepper (n.d.) Virus-related tomato symptom patterns and disease context for distorted or discolored young leaves.. [Online]. Available at: https://content.ces.ncsu.edu/tomato-spotted-wilt-virus-on-tomato-and-pepper (Accessed: 7 November 2026).
Ohio State University Extension, Guernsey County — Leggy Tomato Plants (n.d.) Distinguishing tall supported tomato vines from weak transplants and the option to bury long stems at planting. [Online]. Available at: https://guernsey.osu.edu/program-areas/master-gardener-volunteers/seasonal-gardening-tips/leggy-tomato-plants (Accessed: 7 November 2026).
Penn State Extension — Scouting and Identifying Tomato Diseases (n.d.) Systematic scouting and seeking diagnostic help when visual symptoms are uncertain.. [Online]. Available at: https://extension.psu.edu/scouting-and-identifying-tomato-diseases (Accessed: 7 November 2026).
Penn State Extension — Tomato Diseases (n.d.) Common tomato disease symptoms and the value of checking symptom patterns before treatment.. [Online]. Available at: https://extension.psu.edu/tomato-diseases (Accessed: 7 November 2026).
Penn State Extension — Tomato Diseases and Disorders in the Home Garden (n.d.) Tomato-specific disease patterns, environmental stresses, and cultural practices that reduce foliage disease.. [Online]. Available at: https://extension.psu.edu/tomato-diseases-and-disorders-in-the-home-garden (Accessed: 7 November 2026).
Penn State Extension — Tomato Insect Pests in the Home Garden (n.d.) Aphid body shape, feeding sites, rapid increase, virus transmission, and home-garden beneficial insects. [Online]. Available at: https://extension.psu.edu/tomato-insect-pests-in-the-home-garden (Accessed: 7 November 2026).
Penn State Extension — Tomatoes: From Seedlings to Fruit (n.d.) Tomato warmth, direct sunlight, transplant establishment, and avoiding excess nitrogen. [Online]. Available at: https://extension.psu.edu/tomatoes-from-seedlings-to-fruit (Accessed: 7 November 2026).
Piedmont Master Gardeners — Wilts and Root Rots in the Vegetable Garden (n.d.) Tomato susceptibility, root inspection, color and texture clues, and garden prevention. [Online]. Available at: https://www.piedmontmastergardeners.org/article/wilts-and-root-rots-in-the-vegetable-garden/ (Accessed: 7 November 2026).
Purdue University — Leggy Tomatoes (n.d.) Low indoor light and warm conditions as causes of spindly transplants, plus deep planting and later seed-starting guidance. [Online]. Available at: https://www.purdue.edu/hla/sites/yardandgarden/leggy-tomatoes/ (Accessed: 7 November 2026).
Purdue University Extension — Growing Tomatoes (n.d.) Home garden tomato site selection, planting, and cultivation guidance. [Online]. Available at: https://ag.purdue.edu/department/hla/extension/extension-publications-library/ext-pubs/ho-26-w.html (Accessed: 7 November 2026).
Royal Horticultural Society — Grow Your Own Tomatoes (n.d.) Tomato growing conditions, evenly moist soil, container dry-down, and disease-prevention practices.. [Online]. Available at: https://www.rhs.org.uk/vegetables/tomatoes/grow-your-own (Accessed: 7 November 2026).
Royal Horticultural Society — Mealybug (n.d.) Glasshouse mealybug hosts including tomato, protected growing conditions, symptoms, and general life history. [Online]. Available at: https://www.rhs.org.uk/biodiversity/mealybug (Accessed: 7 November 2026).
Royal Horticultural Society — Tomatoes: leaf problems (n.d.) Tomato-specific physiological leaf problems associated with water, light, temperature, and nutrient conditions.. [Online]. Available at: https://www.rhs.org.uk/problems/tomatoes-leaf-problems (Accessed: 7 November 2026).
Royal Horticultural Society — Tomatoes: Stem Problems (n.d.) Tomato-specific stem symptoms that distinguish wilt with vascular staining from stem lesions, root initials, and mold.. [Online]. Available at: https://www.rhs.org.uk/problems/tomatoes-stem-problems (Accessed: 7 November 2026).
The Ohio State University Extension — Identification and Management of Soilborne Diseases of Tomato (n.d.) Tomato root-rot symptoms and differences from corky root rot, black dot root rot, wilt, and nematode injury. [Online]. Available at: https://ohioline.osu.edu/factsheet/hyg-3314 (Accessed: 7 November 2026).
The Spruce — Tomato Leaves Turning Yellow? 13 Causes and How to Fix Them (n.d.) Editorial symptom comparison for natural aging, nutrient patterns, watering stress, and disease lookalikes.. [Online]. Available at: https://www.thespruce.com/yellow-leaves-on-tomatoes-5211055 (Accessed: 7 November 2026).
Tomato Garden — Planting Tomatoes: How to Fix Thin, Spindly Transplants (n.d.) Handling lanky transplants, reducing breakage risk, and hardening seedlings before outdoor planting. [Online]. Available at: https://growtomato.com/planting-tomatoes-how-to-fix-thin-spindly-transplants/ (Accessed: 7 November 2026).
UC Statewide Integrated Pest Management Program — Damping-off in Tomato (n.d.) Pythium and related soilborne pathogens affecting tomato seedlings. [Online]. Available at: https://ipm.ucanr.edu/agriculture/tomato/damping-off/ (Accessed: 7 November 2026).
UC Statewide Integrated Pest Management Program — Fungus Gnats (n.d.) Distinguishing adult nuisance from larval root injury, seedling risk, moisture reduction, monitoring, and biological control options.. [Online]. Available at: https://ipm.ucanr.edu/home-and-landscape/fungus-gnats/ (Accessed: 7 November 2026).
UC Statewide Integrated Pest Management Program — Mealybugs (n.d.) Identification, lookalikes, honeydew and sooty mold, physical removal, repeat monitoring, and insecticide cautions. [Online]. Available at: https://ipm.ucanr.edu/home-and-landscape/mealybugs/ (Accessed: 7 November 2026).
UC Statewide Integrated Pest Management Program — Tomato Pest Management Guidelines (n.d.) Tomato disease and pest categories that should be considered when yellowing appears with spots, wilt, or distorted growth.. [Online]. Available at: https://ipm.ucanr.edu/agriculture/tomato/ (Accessed: 7 November 2026).
UC Statewide IPM Program — Aphids (n.d.) Aphid feeding, honeydew, predators, water sprays, pruning, and contact-treatment cautions. [Online]. Available at: https://ipm.ucanr.edu/home-and-landscape/aphids/ (Accessed: 7 November 2026).
UC Statewide IPM Program — Green Peach Aphid and Other Early-Season Aphids on Tomato (n.d.) Tomato aphid species, early-season symptoms, virus risk, and natural-enemy context. [Online]. Available at: https://ipm.ucanr.edu/agriculture/tomato/green-peach-aphid/ (Accessed: 7 November 2026).
UC Statewide IPM Program — Potato Aphid on Tomato (n.d.) Potato aphid appearance, high-population injury, honeydew, and beneficial-insect guidance. [Online]. Available at: https://ipm.ucanr.edu/agriculture/tomato/potato-aphid/ (Accessed: 7 November 2026).
UC Statewide IPM Program — Soilborne Diseases in Tomato (n.d.) Soilborne tomato disease context and the need to distinguish root disease from a watering symptom.. [Online]. Available at: https://ipm.ucanr.edu/agriculture/tomato/soilborne-diseases/ (Accessed: 7 November 2026).
UC Statewide IPM Program: Spider Mites (n.d.) Mite identification, stippling and webbing, monitoring, water sprays, natural enemies, and pesticide cautions.. [Online]. Available at: https://ipm.ucanr.edu/home-and-landscape/spider-mites/ (Accessed: 7 November 2026).
UC Statewide IPM Program: Tomato Russet Mite (n.d.) Differential diagnosis for tomato russet mite, including lower-plant bronzing and the need for magnification.. [Online]. Available at: https://ipm.ucanr.edu/agriculture/tomato/tomato-russet-mite/ (Accessed: 7 November 2026).
UConn Extension — Managing Mealybugs in the Greenhouse (n.d.) Greenhouse mealybug hiding places, scouting signs, water sprays, plant removal, and high-nitrogen caution. [Online]. Available at: https://ipm.cahnr.uconn.edu/managing-mealybugs-in-the-greenhouse/ (Accessed: 7 November 2026).
UConn Extension Integrated Pest Management — Managing Fungus Gnats on Vegetable Transplants (n.d.) Vegetable-transplant risk, adult and larval identification, life cycle, scouting with yellow sticky cards, sanitation, moisture management, and repeated larval treatments.. [Online]. Available at: https://ipm.cahnr.uconn.edu/managing-fungus-gnats-on-vegetable-transplants/ (Accessed: 7 November 2026).
UF/IFAS Extension: A Basic Guide to Mushrooms Commonly Encountered in Potted Plants (n.d.) Saprotrophic fungi in potting media, visible mycelium, moisture and drainage conditions, cultural management, and mushroom handling precautions.. [Online]. Available at: https://ask.ifas.ufl.edu/publication/PP377/ (Accessed: 7 November 2026).
UMN tomato symptom keys (n.d.) Tomato. [Online]. Available at: https://apps.extension.umn.edu/garden/diagnose/plant/vegetable/tomato/ (Accessed: 7 November 2026).
University of California Statewide Integrated Pest Management Program — Cultural Tips for Growing Tomato (n.d.) Full sunlight, well-drained soil, warmer planting conditions, and transplant care. [Online]. Available at: https://ipm.ucanr.edu/home-and-landscape/cultural-tips-for-growing-tomato/ (Accessed: 7 November 2026).
University of Connecticut Extension — Pythium Rot of Tomato (n.d.) Tomato Pythium symptoms, wet-soil risk, root decay, and drainage-based prevention. [Online]. Available at: https://ipm.cahnr.uconn.edu/tomato-pythium/ (Accessed: 7 November 2026).
University of Florida IFAS Extension — Tomatoes (n.d.) Tomato water, sunlight, soil-testing, and routine cultural guidance used to assess moisture-related yellowing and prevention.. [Online]. Available at: https://gardeningsolutions.ifas.ufl.edu/plants/edibles/vegetables/tomatoes/ (Accessed: 7 November 2026).
University of Georgia Extension — Growing Good Tomatoes (2025) A broad weekly water range varies with rainfall; steady soil moisture matters, especially as fruit load increases, and dry-to-wet swings can contribute to blossom-end rot.. [Online]. Available at: https://site.extension.uga.edu/gardener/2025/04/growing-good-tomatoes/ (Accessed: 7 November 2026).
University of Georgia Extension, Fulton County — Good Watering Practices Help Keep Tomatoes Healthy (2025) Tomato watering differs with soil and weather; root-zone delivery, mulch, and moisture checks help maintain even soil moisture.. [Online]. Available at: https://site.extension.uga.edu/fultonag/2025/05/good-watering-practices-help-keep-tomatoes-healthy/ (Accessed: 7 November 2026).
University of Maryland Extension: Algae and Fungal Growth on the Soil of Indoor Plants (n.d.) Surface algae and fungal growth associated with wet growing media and practical moisture management.. [Online]. Available at: https://extension.umd.edu/resource/algae-and-fungal-growth-soil-indoor-plants/ (Accessed: 7 November 2026).
University of Minnesota Extension — Fusarium Wilt (n.d.) Tomato susceptibility, Fusarium wilt symptoms, spread, and management.. [Online]. Available at: https://extension.umn.edu/agriculture/specialty-crops/vegetable-farming/disease-management/fusarium-wilt (Accessed: 7 November 2026).
University of Minnesota Extension — Growing tomatoes (n.d.) Tomato growing conditions and practical home-garden care context. [Online]. Available at: https://extension.umn.edu/garden-and-home/yard-and-garden/gardening-in-minnesota/growing-tomatoes (Accessed: 7 November 2026).
University of Minnesota Extension — Tomato Disorders (n.d.) Tomato fruit disorders such as blossom-end rot and cracking can accompany irregular water availability and should not be treated as a simple leaf-wilt diagnosis.. [Online]. Available at: https://extension.umn.edu/garden-problems/tomato-disorders (Accessed: 7 November 2026).
University of Minnesota Extension — Tomato leaf spots diagnostic guide (n.d.) Distinguishing tomato leaf tip browning from Septoria, early blight, bacterial spots, and late blight by lesion pattern and spread.. [Online]. Available at: https://apps.extension.umn.edu/garden/diagnose/plant/vegetable/tomato/leavesspots.html (Accessed: 7 November 2026).
University of Minnesota Extension — Tomato: Curled/distorted/unusually shaped leaves (n.d.) Tomato leaf roll appearance and its association with drought stress; differentiating curl from aphids, virus, and herbicide injury. [Online]. Available at: https://apps.extension.umn.edu/garden/diagnose/plant/vegetable/tomato/leavescurled.html (Accessed: 7 November 2026).
University of Minnesota Extension — Tomato: Insects under 1 inch (n.d.) Tomato aphid appearance and the distinction between small and large infestations. [Online]. Available at: https://apps.extension.umn.edu/garden/diagnose/plant/vegetable/tomato/insectsunder1.html (Accessed: 7 November 2026).
University of Minnesota Extension — Tomato: Plant Wilts (n.d.) Tomato-specific wilt lookalikes and distinguishing signs of Verticillium wilt, Fusarium wilt, white mold, and damping-off.. [Online]. Available at: https://apps.extension.umn.edu/garden/diagnose/plant/vegetable/tomato/plantwilt.html (Accessed: 7 November 2026).
University of Minnesota Extension — Tomato: Wilting/drooping leaves (n.d.) Wilt lookalikes including water deficit, pests, and vascular diseases. [Online]. Available at: https://apps.extension.umn.edu/garden/diagnose/plant/vegetable/tomato/leaveswilted.html (Accessed: 7 November 2026).
University of Minnesota Extension — Watering the vegetable garden (n.d.) Checking and maintaining garden soil moisture during hot, dry weather. [Online]. Available at: https://extension.umn.edu/garden-and-home/yard-and-garden/gardening-in-minnesota/watering-the-vegetable-garden (Accessed: 7 November 2026).
University of Wisconsin-Madison Extension — Fungus Gnats on Houseplants (n.d.) Fungus gnat appearance, larvae in potting media, potato-slice checks, surface drying, sticky-card monitoring, and the time required for control.. [Online]. Available at: https://hort.extension.wisc.edu/articles/fungus-gnats-on-houseplants/ (Accessed: 7 November 2026).
University of Wisconsin–Madison Extension — Mealybugs (n.d.) Mealybug body shape, wax covering, feeding injury, honeydew, and scouting leaf whorls. [Online]. Available at: https://hort.extension.wisc.edu/articles/mealybugs/ (Accessed: 7 November 2026).
University of Wisconsin–Madison Extension — Reasons Why Plants Wilt (n.d.) How heat, drought, and saturated soil can impair water balance and cause wilting.. [Online]. Available at: https://hort.extension.wisc.edu/reasons-why-plants-wilt/ (Accessed: 7 November 2026).
University of Wisconsin–Madison Plant Disease Diagnostics Clinic — Root and Crown Rots (n.d.) Limits of visual diagnosis and when to seek laboratory identification. [Online]. Available at: https://hort.extension.wisc.edu/articles/root-and-crown-rots/ (Accessed: 7 November 2026).
Utah State University Extension — Irrigation for Tomato, Pepper, and Eggplant (n.d.) Tomato-family crops need regular, uniform watering; deep irrigation, growth and heat effects on demand, and monitoring soil moisture.. [Online]. Available at: https://extension.usu.edu/vegetableguide/tomato-pepper-eggplant/irrigation (Accessed: 7 November 2026).
Utah State University Extension: Two-Spotted Spider Mite (n.d.) Solanaceae hosts, underside feeding, paper-shake monitoring, life cycle, and control cautions.. [Online]. Available at: https://extension.usu.edu/planthealth/ipm/notes_ag/veg-spider-mites (Accessed: 7 November 2026).
Utah State University Extension: Web-Spinning Mites (n.d.) Rapid hot-weather population growth, difficult monitoring, and how broad-spectrum pesticide use can disrupt biological control.. [Online]. Available at: https://extension.usu.edu/pests/research/web-spinning-mites (Accessed: 7 November 2026).
Vegetables by Bayer / De Ruiter — Temperature, Humidity, and Water in Protected Culture Tomatoes (n.d.) How relative humidity and vapor-pressure deficit affect transpiration in greenhouse tomatoes, with production-specific caveats. [Online]. Available at: https://www.vegetables.bayer.com/us/en-us/resources/growing-tips-and-innovation-articles/cultivation-insights/temperature-humidity-and-water-in-protected-culture-tomatoes.html (Accessed: 7 November 2026).
Virginia Tech Extension — Fungus Gnats and Shore Flies (n.d.) Breeding in moist organic media, the shallow larval zone, using surface drying and sticky cards, and choosing label-directed larval controls.. [Online]. Available at: https://www.pubs.ext.vt.edu/3104/3104-1579/3104-1579.html (Accessed: 7 November 2026).