Introduction to Greenhouse Diseases Seminar for ProGreen2009

Plant Disease Certified Greenhouse Grower Brooke Edmunds Colorado State University Extension

Definition of Disease? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Biotic disease ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Plant Disease Triangle Susceptible plant Suitable Environment Pathogen DISEASE

Steps to Diagnose Plant Disease ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

What else can be done to ID disease on-site? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Symptom vs Sign ( effect vs cause) ,[object Object],[object Object]

C. Powdery Mildew seen through a hand lens

D. Rotted base of hydroponic lettuce

Biotic diseases ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Fungi Filamentous or thread-like body called hyphae (plural). A mass of hyphae is called mycellium.

Fungi ,[object Object],[object Object],[object Object],[object Object]

Where do fungi commonly attack? Foliage Root/Crown Vascular system

Foliar Fungal Diseases ,[object Object],[object Object]

Powdery Mildew ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Powdery Mildew Management ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Downy Mildew ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Downy Mildew Management ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Botrytis ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Signs

Botrytis Management ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Thielaviopsis root rot of petunia Photos: Kansas State Univ. Pythium on Geraniums Fungal Root & Crown Rots

Pythium on watermelon transplants

The Fungi involved ,[object Object],[object Object],[object Object],[object Object],Thielaviopsis spores in root tissue Rhizoctonia mycelium in root tissue

Root & Crown Rot Management ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Management of Root & Crown Rots: Fungicides ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Always read the label!

[object Object],Vascular Wilt caused by Fungi Botrytis mycelium

Management of Vascular Wilt ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Bacteria ,[object Object],[object Object],[object Object],[object Object],[object Object]

Symptoms of Bacterial Disease ,[object Object],Crown Gall

Symptoms of Bacterial Disease ,[object Object]

Diagnosis of Bacterial Disease ,[object Object],[object Object],Photo: Penn State Univ.

Diagnosis of Bacterial Diseases ,[object Object],[object Object],[object Object],[object Object]

Erwinia soft rot ,[object Object],[object Object],[object Object],[object Object],Poinsettia

Xanthomonas ,[object Object],[object Object],[object Object],[object Object]

Pseudomonas ,[object Object],[object Object],[object Object]

Ralstonia ,[object Object],[object Object],[object Object],[object Object],[object Object]

Management of Bacterial Diseases ,[object Object],[object Object],[object Object],[object Object],[object Object]

Viruses ,[object Object],[object Object],[object Object],[object Object]

Impatiens Necrotic Spot Virus (INSV) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Tomato Spotted Wilt Virus (TSWV) ,[object Object],[object Object]

Diagnosis of INSV/TSWV ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Management of Virus Diseases ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Abiotic Diseases ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Common Abiotic Diseases/Disorders Edema

Common Abiotic Diseases/Disorders Leaf Scorch

Blossom End of Tomato Common Abiotic Diseases/Disorders

Introduction to Greenhouse Diseases Seminar for ProGreen2009

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Introduction to Greenhouse Diseases Seminar for ProGreen2009