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PLNT 4270 > Sclerotinia Stem Rot (SSR) > Flashcards

Sclerotinia Stem Rot (SSR) Flashcards

1
Q

What is the causal agent for Sclerotinia Stem Rot?

A

Sclerotinia Sclerotiorum

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2
Q

How many hosts does SSR have?

A

over 400 plant species

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3
Q

Give 8 examples of hosts of SSR.

A

Sunflowers, Lentils, Peas, Beans, Flax, Alfalfa, Potatoes, and Hemp

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4
Q

Give 6 examples of non-host crops.

A

Wheat, Rice, Oats, Rye, Barley and Corn.

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5
Q

What percentage of host crops for SSR is grown in Canada?

A

90%

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6
Q

What kind of a fungus is SSR?

A

Apothecium

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7
Q

What kind of spores are produces by SSR?

A

Ascospores

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8
Q

How much humidity does SSR like?

A

75 - 80%

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9
Q

What kind of a parasite is SSR?

A

Facultative parasite.

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10
Q

Which part of the plant do ascospores from SSR adhere to?

A

The flowers

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11
Q

When is the best time to apply fungicide for SSR?

A

During the flowering stage.

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12
Q

What are 4 symptoms of SSR?

A
  1. Light brown patches on stems, branches, and pods. These legions expand and take on a greyish white color.
  2. Early ripening
  3. Bleaching.
  4. Shredded stems.
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13
Q

Where can sclerotia be found in SSR?

A

Inside the stem.

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14
Q

When do symptoms of SSR usually appear?

A

2-3 weeks after infection.

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15
Q

What are the favorable environmental conditions for SSR?

A

Soil and canopy moisture. 20-25 degree C and high humidity. Warm dry conditions will pause infection until conditions are favorable again.

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16
Q

How much yield is lost due to SSR under favorable conditions?

A

50%

17
Q

How is yield lost due to SSR?

A

Smaller and fewer seeds.
Premature ripening
shattered pods.
Reduced seed filling
Loss of smaller seeds during combining.

18
Q

How are management practices with SSR related to canola cultivars with fewer petals?

A

Cultivars with fewer petals show less infection.

19
Q

What are 6 ways to manage SSR?

A
  1. Clean seed
  2. Weed control
  3. Crop rotation
  4. Burning Stubble to irradicate sclerotia.
  5. Foliar fungicide
  6. Biocontrol.
20
Q

When should you apply the foliar fungicide for SSR?

A

When 20 - 30% of the flowers are in bloom.

PLNT 4270 (17 decks)

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