Pathogenesis and Seedling Diseases LEARNING OBJECTIVES: The Disease Triangle Heterotrophy and Pathogenesis Saprotrophs, Necrotrophs, and Biotrophs Growth.

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Presentation transcript:

Pathogenesis and Seedling Diseases LEARNING OBJECTIVES: The Disease Triangle Heterotrophy and Pathogenesis Saprotrophs, Necrotrophs, and Biotrophs Growth and Reproduction of Fungi in Plants Seedling Diseases Damping-off Fusarium root rot Top Blight Phytophthora root rot

PLANT DISEASE TRIANGLE ENVIRONMENT PATHOGEN HOST

FOMITOPSIS PINICOLA RED BELT CONK “BROWN CRUMBLY ROT” SAPROTROPHIC FUNGI

SYCAMORE ANTHRACNOSE NECROTROPHIC PATHOGENS

POWDERY MILDEW HYPHAE ASCOCARPS BIOTROPHIC PATHOGENS

Growth of Fungi in Plants HYPHAE

PATHOGENESIS TOXINSENZYMES GROWTH REGULATORS

RHYTISMA PUNCTATUM ACER MACROPHYLLUM

Cedar root rot Phytophthora lateralis

Asexual Reproduction of Fungi Oomycetes- Zoospores Ascomycetes - Conidiospores

SWISS NEEDLE CAST PHAEOCRYPTOPUS GAEUMANNII Sexual Reproduction of Fungi Ascospores

CROP ROTATION FUMIGATION

PRECISION SOWING

PLANT DISEASE TRIANGLE ENVIRONMENT PATHOGEN HOST

DAMPING OFF– PYTHIUM – a Watermold HOSTENVIRONMENT PATHOGEN

SPORANGIA Release Zoospores

SEXUAL OOSPORES

FUSARIUM ROOT ROT or 4 TH OF JULY DISEASE– FUSARIUM OXYSPORUM

HOSTENVIRONMENT PATHOGEN

TOP BLIGHT– PHOMA, FUSARIUM

HOSTENVIRONMENT PATHOGEN

WINTER INJURY--ABIOTIC

“STORAGE BLIGHT” -- ABIOTIC

PHYTOPHTHORA ROOT ROT IN DOUGLAS-FIR

SPORANGIA HOSTENVIRONMENT PATHOGEN

OOSPORE

DAMPING OFF– PYTHIUM HOSTENVIRONMENT PATHOGEN

SPORANGIA

FUSARIUM ROOT ROT or 4 TH OF JULY DISEASE– FUSARIUM OXYSPORUM