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Diseases of Crops > Corn Viruses > Flashcards

Corn Viruses Flashcards

1
Q

What is the causal organism of corn stunt?

A

Spiroplasma kunkelii (a virus)

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2
Q

What is a mollicute?

A

has no cell wall

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3
Q

Where is the corn stunt virus found in the plant?

A

phloem

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4
Q

What is the vector for corn stunt?

A

leafhoppers

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5
Q

In what manner does corn stunt survive in leafhoppers?

A

persistent and propagative (replicates in leafhoppers)

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6
Q

Where does corn stunt overwinter?

A

in leafhoppers

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7
Q

What is Spiroplasma kunkelii?

A

a virus that causes corn stunt

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8
Q

What shape is the corn stunt virus?

A

spiral (easy to identify)

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9
Q

Where in the world is corn stunt present?

A

North and South America Only

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10
Q

What are two symptoms of corn stunt?

A

stunting growth, loose to?oth ears?, reddening

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11
Q

Which leaves turn red first in response to corn stunt?

A

Older leaves

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12
Q

What is a Dalbulus maidis?

A

leafhopper

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13
Q

What causes maize dwarf mosaic?

A

maize dwarf mosaic virus

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14
Q

How is maize dwarf mosaic virus transmitted? (3 ways)

A 
Aphids in a non-persistent manner, 
seed transmitted (rare), 
mechanically through leaf rubbing
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15
Q

What does MDMV stand for?

A

maize dwarf mosaic virus

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16
Q

What alternate hosts does maize dwarf mosaic virus infect? (2)

A

Johnsongrass and sorghum

17
Q

Where is maize dwarf mosaic virus in the USA?

A

Eastern USA starting at Texas and moving East

18
Q

List 2 symptoms of MDMV

A

chlorotic spots and streaks on green, young leaves

stunting

19
Q

How long does it take for MDMV symptoms to appear?

A

six weeks after aphids feed and transmit the virus

20
Q

List three ways to manage MDMV

A

Tolerant corn hybrids
Avoid aphids
Control of Johnsongrass with herbicides

21
Q

What is MCDV?

A

Maize chlorotic dwarf virus

22
Q

What is Waikavirus?

A

Maize chlorotic dwarf virus

23
Q

How is maize chlorotic dwarf virus transmitted?

A

leafhoppers, semi-persistently

24
Q

What is Greminella nigrofons?

A

a leafhopper that is the most important maize chlorotic dwarf virus vector

25
Q

Is MCDV or MDMV more widespread in USA?

A

MDMV

26
Q

List two disease control methods for MCDV.

A

Control Johnsongrass,

Control leafhoppers

27
Q

How many states in the USA have Johnsongrass?

A

All 48 mainland states.

28
Q

Are there variants of the MCDV?

A

Yes - 2 variants currently known

Diseases of Crops (11 decks)

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