Soybean diseases Flashcards by Michelle Pottinger

Q

Sclerotinia White Mould Conditions

A

Cool, wet

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Q

Phytophthora Rot symptoms

A

Early - seed rot, pre emerge dampening off

Late - stem or root rot

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Q

How does phytophthora rot spread?

A

soil borne spores

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Q

Phytophthora rot scientifica name

A

pytophthora sojae

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Q

What is phytophthora rot?

A

oomycete

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Q

Rhizoctonia Stem Rot scientific

A

Rhizoctonia solani

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Q

What does Rhizoctonia Stem rot cause?

A

Pre or post emergence damping off of seedlings

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Q

Rhizoctonia stem rot conditions

A

warm, dry soils

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Q

How is rhizoctonia spread?

A

soil borne

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Q

What is septoria brown spot

A

ascomycete

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Q

Septoria brown spot conditions

A

Warm, wet weather

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Q

How is septoria brown spot spread?

A

wind and rain splashing, stubble borne, may be seed borne

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Q

Downy mildew conditons

A

high humidity, high temperatures

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Q

What is downy mildew

A

oospore

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Q

Asian soybean rust pathogen

A

Phakopsora pachyrhizi

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Q

Asian soybean rust conditions

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A

high humidity

Q

How is asian soybean rust spread

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A

spread by wind, not soil borne or seed borne

Q

Bacterial blight conditions

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A

usually several days after a rain or a hail storm

Q

How does bacterial blight spread?

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A

wind driven rain

Q

Cercospora Leaf spot (frog eye spot) conditions

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A

warm, humid weather

Q

what is Cercospora Leaf spot (frog eye spot)

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A

ascomyce (fungus)