IHA Education October Webinar - Syngenta - Fungicides | Attempts: 96

2.

Botrytis spores occur naturally in many growing environments and threaten crops when conditions are:

Hot and Dry
Cool and Wet
Hot and Wet
Warm and Dry

Correct Answer

A. Cool and Wet

Explanation

Botrytis spores occur naturally in many growing environments and threaten crops when conditions are cool and wet. This is because Botrytis, also known as gray mold, thrives in cool and moist conditions. These conditions create the perfect environment for the spores to germinate and spread, leading to the infection and damage of crops.

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3.

Temperatures most favorable for Downy Mildew development are:

35 - 55 F
50 - 72 F
65 - 85 F
None of the above

Correct Answer

A. 50 - 72 F

Explanation

Downy Mildew is a fungal disease that affects plants, particularly during periods of cool and wet weather. The temperatures most favorable for Downy Mildew development are between 50 - 72 F. This range provides the ideal conditions for the growth and spread of the fungus. Temperatures below 50 F or above 72 F are less suitable for the disease to thrive. Therefore, the correct answer is 50 - 72 F.

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4.

Both Downy Mildew and Botrytis thrive when the relative humidity is:

Greater than 85%
Greater than 95%
Lower than 75%
Relative humidity does not affect these fungal pathogens

Correct Answer

A. Greater than 85%

Explanation

Both Downy Mildew and Botrytis are fungal pathogens that thrive in high humidity conditions. A relative humidity greater than 85% provides the ideal environment for these pathogens to grow and spread. In such conditions, the spores of these fungi are more likely to germinate and infect plants, leading to disease development. High humidity creates a moist environment that favors the growth and multiplication of these pathogens, allowing them to cause damage to plants. Therefore, a relative humidity greater than 85% is conducive for the growth and spread of Downy Mildew and Botrytis.

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5.

Crops that are most prone to Downy mildew include:

Begonia, Pentas, Lantana, Buddleia, Poinsettia
Dahlia, Penstemon, Heuchera, Geraniums, Bergenia
Phlox, Rose, Salvia, Coleus, Buddleia, Alyssum
Petunia, Marigold, Chrysanthemum, Zinnia, Ageratum

Correct Answer

A. Phlox, Rose, Salvia, Coleus, Buddleia, Alyssum

Explanation

The crops that are most prone to Downy mildew are Phlox, Rose, Salvia, Coleus, Buddleia, and Alyssum.

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6.

A fungicide rotation for prevention of Downy Mildew would include:

Chipco 26019, Eagle/Hoist, Decree, Cleary’s 3336/OHP6672
Heritage, Subdue Maxx, Stature SC, Protect DF/Dithane 75DF
Daconil, Medallion, Subdue Maxx, Terraguard
Strike, Banner Maxx, Decree, Medallion

Correct Answer

A. Heritage, Subdue Maxx, Stature SC, Protect DF/Dithane 75DF

7.

Botrytis can infect:

Roots
Stems, old leaves and flowers
Young shoots and emerging leaves
All of the above
B & C

Correct Answer

A. B & C

Explanation

Botrytis can infect young shoots and emerging leaves, as well as stems, old leaves, and flowers. This means that it can affect all of the options given in the question, which are B & C.

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8.

Symptoms of Downy Mildew infections include:

Yellow, tan or reddish blotch areas on the topside of the leaves
Distorted new growth
Fuzzy mat-like growth on the underside of the leaves
All of the above
A & B

Correct Answer

A. All of the above

Explanation

The correct answer is "All of the above". This means that all the symptoms mentioned in the question are symptoms of Downy Mildew infections. These symptoms include yellow, tan or reddish blotch areas on the topside of the leaves, distorted new growth, and fuzzy mat-like growth on the underside of the leaves.

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9.

All Downy Mildew fungi are capable of infecting all ornamental crops:

True
False

Correct Answer

A. False

Explanation

Downy Mildew fungi are a diverse group of fungi that can infect a wide range of plants, including ornamental crops. However, not all Downy Mildew fungi are capable of infecting all ornamental crops. Different species of Downy Mildew fungi have specific host ranges and can only infect certain plants. Therefore, the statement that all Downy Mildew fungi are capable of infecting all ornamental crops is false.

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10.

A fungicide rotation for prevention of Botrytis will include:

Stature SC, Kocide, Subdue Maxx, Dithane
Decree, Medallion, Daconil, Chipco
Terraguard, Banner Maxx, Eagle, Aliette
All of the above
A & C

Correct Answer

A. Decree, Medallion, Daconil, Chipco

Explanation

The correct answer is Decree, Medallion, Daconil, Chipco. These fungicides are included in a rotation for prevention of Botrytis. Botrytis is a fungal disease that affects various plants and crops. Rotating different fungicides helps prevent the development of resistance in the Botrytis population, ensuring effective control of the disease. Decree, Medallion, Daconil, and Chipco are all effective fungicides that can be used in rotation to manage Botrytis.

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Iha Education October Webinar - Syngenta - Fungicides

The best way to prevent infections by Botrytis:

Quiz Preview

Botrytis spores occur naturally in many growing environments and threaten crops when conditions are:

Temperatures most favorable for Downy Mildew development are:

Both Downy Mildew and Botrytis thrive when the relative humidity is:

Crops that are most prone to Downy mildew include:

A fungicide rotation for prevention of Downy Mildew would include:

Botrytis can infect:

Symptoms of Downy Mildew infections include:

All Downy Mildew fungi are capable of infecting all ornamental crops:

A fungicide rotation for prevention of Botrytis will include: