Chestnut Blight & Laurel Wilt Flashcards

1
Q

What year was Chestnut Blight discovered in New York?

A

1904

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2
Q

How many trees were killed by chestnut blight by 1950?

A

4 billion

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3
Q

What type of organism causes chestnut blight?

A

A fungus

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4
Q

Where did chestnut blight come from to the USA?

A

Asia - via nursery stock

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5
Q

What is the name of the organism that causes chestnut blight?

A

Cryphonectria parasitica

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6
Q

What is Cryphonectria parasitica?

A

the causal organism of chestnut blight

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7
Q

What is a symptom of chestnut blight that shows up on the bark of the tree?

A

Reddish-orange stromata

Cankers

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8
Q

What are cankers?

A

dead areas of xylem and phloem that disrupt the flow of water and nutrients

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9
Q

When does death occur from chestnut blight?

A

When the entire stem is girdled by a single canker or multiple cankers

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10
Q

What are three alternate host trees for chestnut blight?

A

oak
hickory
maple

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11
Q

How did trees survive in France from infection of chestnut blight?

A

The cankers were hypovirulent

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12
Q

Define hypovirulent

A

reduced damage to a host

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13
Q

What does the hypovirulent chestnut blight fungus produce less of?

A

oxalic acid

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14
Q

When was the Plant Quarantine Act written into law?

A

1912

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15
Q

What was the first legal action by the US to prevent the introduction of foreign pests and pathogens?

A

Plant Quarantine Act of 2012

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16
Q

What were the first two plants quarantined in the US? What were their diseases?

A
Chestnut (Blight)
White Pine (Blister rust)
17
Q

List four hosts of Laurel Wilt

A

Redbay
Sassafras
Avocado
European bay laurel (bay leaves used in cooking)

18
Q

What plant do bay leaves used in cooking come from?

A

European bay laurel

19
Q

What type of organism is Laurel Wilt?

20
Q

What is Raffaelea lauricola?

A

Laurel wilt fungus

21
Q

What spreads the laurel wilt fungus?

A

Ambrosia beetle

22
Q

Where are laurel wilt and the ambrosia beetle native to?

23
Q

How did the ambrosia beetle enter the USA?

A

by riding in packing crates (pallet shipments)

24
Q

List three ways laurel wilt can spread.

A

Ambrosia beetle
Transportation of infested firewood
Sassafras root grafts

25
Which plant is almost eliminated from the costal system due to laurel wilt?
Redbay
26
What insect depends on the Redbay plant for its larvae?
Palamedes swallowtail