A close view over a mixed vegetable canopy with a few leaves carrying early blemishes.

Crop Science

Plant Pests & Plant Diseases: Identify and Treat Crop Problems

There's a solution to every crop problem.

This library covers 80 plant pests and diseases of commercial crops - insects, mites and nematodes, the fungal, bacterial and viral plant diseases, and the nutritional and physiological disorders that are routinely mistaken for them.

Not sure what's attacking your crop? Ask Vegalab for a diagnosis and a crop-specific program. Request a diagnosis

Every entry sets out how to identify the problem, its life cycle and spread, the conditions that favour it, how to monitor for it, and the management options - including the ones that are not ours and where they fall short. Product claims, rates and availability vary by jurisdiction; always follow the applicable label.

Browse by category

Insects & Mites 26

Sap-suckers, borers and mites · identify the pest and match it to a natural control.

Nematodes 3

Microscopic roundworms that attack roots below ground - root-knot, sting, ring, lesion and more, each identified by assay.

Soil & Root Pests 1

Soil-dwelling parasites that attack roots and rob vigour below ground.

Slugs, Worms & Other Pests 3

Slugs, snails, invasive worms and aquatic larvae - pests that don't fit the usual groups.

Fungal & Oomycete Diseases 25

Mildews, blights, rots and wilts - including oomycetes like downy mildew and Phytophthora.

Bacterial Diseases 6

Blights, cankers and spots spread by water and wounds - prevention-led management.

Viruses 3

No cure once infected · these guides lead with prevention and insect-vector control.

Disorders & Nutrient Deficiencies 12

Not a pest at all - nutrient, water and physiological problems and how to correct them.

Beneficial & Apiary Threats 1

Invasive predators of beneficial insects - managed to protect honey bees and pollination, with bee-safety built into the method.

Organic / low-residue

Insects & Mites 26

Insects & MitesAphidsTomatoes, Peppers, Brassicas, Ornamentals Insects & MitesSpider MitesStrawberries, Cannabis, Grapes, Tomatoes Insects & MitesBroad & Russet MitesPeppers, Tomatoes, Cannabis, Citrus Insects & MitesThripsOnions, Peppers, Ornamentals, Grapes Insects & MitesWhitefliesTomatoes, Cucumbers, Peppers, Ornamentals Insects & MitesApple MiteApples, Pears, Stone Fruit Insects & MitesCaterpillarsBrassicas, Tomatoes, Corn, Grapes Insects & MitesCodling MothApples, Pears Insects & MitesLeaf MinersTomatoes, Leafy Greens, Ornamentals, Citrus Insects & MitesPeach Fruit Moth (Carposina)Peaches, Apples, Pears Insects & MitesCotton BollwormCotton, Corn, Tomato, Pepper Insects & MitesLygus & Plant BugsCotton, Strawberries, Vegetables, Legumes Insects & MitesArmyworm & CutwormCereals, Corn, Brassicas, Vegetables Insects & MitesScale InsectsTree fruit, Citrus, Vines, Ornamentals Insects & MitesMealybugsVines, Citrus, Tree fruit, Cannabis Insects & MitesStem BorersCorn, Rice, Sugarcane, Sorghum Insects & MitesLeaffolderRice Insects & MitesLeafhoppersCotton, Vines, Potato, Vegetables Insects & MitesDiamondback Moth & Cabbage CaterpillarsCabbage, Broccoli, Cauliflower, Canola Insects & MitesOriental Fruit MothPeach, Apple, Plum, Nectarine Insects & MitesClearwing & Peach Tree BorersPeach, Cherry, Plum, Apple Insects & MitesMelonworm & PicklewormCucumber, Melon, Squash, Pumpkin Insects & MitesWestern Flower ThripsGreenhouse crops, Peppers, Tomatoes, Strawberries Insects & MitesCabbage LooperCabbage, Lettuce, Broccoli, Tomato Insects & MitesPink BollwormCotton, Okra Insects & MitesCitrus Rust MiteCitrus, Oranges, Grapefruit, Lemons

Nematodes 3

NematodesRoot-Knot NematodesTomatoes, Cucumbers, Melons, Peppers NematodesLesion NematodeCereals, Corn, Tree fruit, Potato NematodesPlant-Parasitic Nematodes

Soil & Root Pests 1

Soil & Root PestsReniform NematodeCotton, Vegetables, Soybean, Sweet potato

Slugs, Worms & Other Pests 3

Slugs, Worms & Other PestsSlugs & SnailsLettuce, Brassicas, Strawberries, Seedlings Slugs, Worms & Other PestsJumping WormsOrnamentals, Turf, Nursery, Vegetables Slugs, Worms & Other PestsMosquito LarvaeIrrigated Row Crops, Orchards, Greenhouse

Fungal & Oomycete Diseases 25

Bacterial Diseases 6

Bacterial DiseasesFire BlightApples, Pears Bacterial DiseasesBacterial BlightBeans, Brassicas, Stone Fruit, Rice Bacterial DiseasesBacterial Shot HolePeaches, Cherries, Plums, Apricots Bacterial DiseasesBacterial Spot & SpeckTomato, Pepper, Peach, Stone fruit Bacterial DiseasesBacterial Blight of RiceRice Bacterial DiseasesWalnut BlightWalnuts, Tree Nuts

Viruses 3

VirusesMosaic VirusTomatoes, Cucurbits, Peppers, Tobacco VirusesLeaf Curl VirusesTomatoes, Peppers, Cucurbits VirusesCurly TopTomatoes, Peppers, Sugar Beet, Beans

Disorders & Nutrient Deficiencies 12

Beneficial & Apiary Threats 1

Beneficial & Apiary ThreatsAsian Hornet (Vespa velutina)

Ask Vegalab for a crop diagnosis

Not sure what's attacking your crop? Tell us what you're seeing and a Vegalab agronomist will recommend a crop-specific program. Photos are optional but help. Product availability and claims vary by jurisdiction.