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Hansen's Plant Pest Library is an invaluable resource for Missouri homeowners who want to learn more about pests and diseases that can affect their trees.

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Plant Pest Library

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Types of Pests

Diseases
Fungus
Bacteria
Virus
Mycoplasma
Nematode
Insects & Mites
Abiotic
All Types

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fungal diseases
Apple Scab

Apple scab is a fungus that causes leaves of susceptible apple and crabapple trees to yellow and fall off. [...]

pest management
Aphids

Aphids are small, soft-bodied insects that feed on plants’ sap using their long,slender mouths to pierce stems, leaves,and other tender plant parts. [...]

pest management
Gouty/Horned Oak Gall

Gouty and horned oak galls are abnormal growths caused by a microscopic wasp that produces chemicals in the tree when depositing eggs. [...]

pest management
Emerald Ash Borer

Emerald ash borer is an invasive beetle that feeds on ash trees in North America. [...]