diagnosing plant disorders introduction to plant science j.g. mexal

Diagnosing Plant Disorders

Introduction to Plant Science

J.G. Mexal

Diagnosing Plant Disorders

Verticillium wilt

Dark discoloration

What’s Killing Your Trees

Fire blight

CotoneasterPear

Apple

E. Shannon

What’s Killing Your Trees

Crown gall on pecan

E. Shannon

Gall on Ponderosa Pine

What’s Killing Your Trees

Slime flux

J. Mexal

E. Shannon

Types of ‘Disease’

• Abiotic - Physcial Factors– Temperature– Moisture– Nutrients

• Biotic - Biological– Insect– Disease (Fungi, Bacteria, Virus)– DPD- human

What’s Killing Your Trees

Mistletoe (leafy & dwarf)

J. Mexal

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What’s Killing Your Trees

Lichens

Eriophyid mites on ash

0.01”

What’s Killing Your Trees

Spider Mites

Adult Webbing

Damage USFS

What’s Killing Your Trees

Insects

E. Shannon

Shot-hole borer

Pine Tip-moth

Aphid Predator Egg Masses

Pecan Update Blackmargined Aphid / B. Lewis

What’s Killing Your Trees

Pecan Twig Girdler

What’s Killing Your Trees

Apple Flat Head Borer Larva

Wood Borer

Bob Cain

What’s Killing Your Trees

Insects

Types of ‘Disease’

• Abiotic - Physcial Factors– Temperature– Moisture– Nutrients

• Biotic - Biological– Insect– Disease (Fungi, Bacteria, Virus)– DPD- human

What’s Killing Your Trees

The Biggest Killer of Trees--DPD

It’s still alive, but for how long?

J. Mexal

What’s Killing Your Trees

What are the critical parts of a tree?

Xylem

Bark

Cambium

Things to Know

• Disease triangle

• Types of Disease

• Diseases in New Mexico