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CA Walnut Conference 2021 Day 1 – Test

CA Walnut Conference 2021 Day 1 – Test

Thank you for watching Day 1 of the California Walnut Conference! Below is the quiz for day 1. You must pass with a 70% or higher to get credit.

If you do not pass the first time you will be allowed to retake it until you pass.

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Question 1 of 19

1. Question

Walnut husk flies attack on:

Tree branches
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Leaves
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Fruits/nuts
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Question 2 of 19

2. Question

In general, walnut husk fly infestation in the orchard tend to be:

Throughout the orchard evenly
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Patchy distribution in certain areas within the orchard
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In the soil
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Question 3 of 19

3. Question

Are there commercial traps/lures available for walnut husk fly monitoring?

Yes
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No
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Question 4 of 19

4. Question

Current insecticide control is effective at what stage of the husk fly?

Larvae
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Pupae
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Adult flies
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Correct

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Question 5 of 19

5. Question

Which of these herbicide active ingredients is primarily used as a preemergence material?

Carfentrazone (Shark)
Correct Incorrect Correct answer

Saflufenacil (Treevix)
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Indaziflam (Alion)
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Paraquat (Gramoxone)
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Question 6 of 19

6. Question

When aggregated by site-of-action, the ACCase inhibiting grass herbicides are the most widely used group in walnut.

True
Correct Incorrect Correct answer

False
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Correct

Incorrect
Question 7 of 19

7. Question

Multiple resistance in weeds is usually due to more than one mechanism of resistance rather than one mechanism conferring resistance to two chemistries.

True
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False
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Correct

Incorrect
Question 8 of 19

8. Question

Experimental evidence suggests that more than two applications of glyphosate in an orchard crop is likely to lead to micronutrient deficiencies.

True
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False
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Correct

Incorrect
Question 9 of 19

9. Question

What are the most common fungi causing walnut mold?

Alternaria, Fusarium, and Aspergillus niger
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Botryosphaeria?
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Phomopsis?
Correct Incorrect Correct answer

Bread mold?
Correct Incorrect Correct answer

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Question 10 of 19

10. Question

Which type of walnut fruit will have high mold?

The ones that are harvested late.
Correct Incorrect Correct answer

The ones that drop (windfalls).
Correct Incorrect Correct answer

Insect infested nuts.
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All of the above.
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Correct

Incorrect
Question 11 of 19

11. Question

Sprays with fungicides in early hull split are effective in reducing mold.

True
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False
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Question 12 of 19

12. Question

What diseases do sprays with fungicides in mid-May, mid-June, and mid-July reduce?

Botryosphaeria/Phomopsis canker?
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Alternaria mold?
Correct Incorrect Correct answer

Fusarium mold?
Correct Incorrect Correct answer

Aspergillus mold?
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Correct

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Question 13 of 19

13. Question

What nematode species is currently considered the most damaging parasite on walnut?

Ring nematode
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Root-knot nematode
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Root lesion nematode
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None of the nematodes above cause any damage to walnut
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Question 14 of 19

14. Question

All nematodes are bad soil organisms that cause losses to agricultural production. Is this statement true?

True
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False
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Question 15 of 19

15. Question

What should be considered when choosing a rootstock?

Field history
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Soil Type
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Prior records of soil-borne problems
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all of the above.
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Question 16 of 19

16. Question

Why is it important to take a soil sample for nematode detection and ID before starting future orchard ground preparation?

Because nematodes will occur whenever walnut is grown.
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Because this can help decide whether to fumigate and what rootstock to choose.
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Because preplant soil fumigation is always beneficial
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Soil sampling and nematode evaluations are unnecessary and expensive procedures that never pay for themselves
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Question 17 of 19

17. Question

The greatest spore release of Diaporthaceae and Botryosphaeriaceae spp. occurr:

During and following rain events.
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Following shredding/grinding infected branches between tree rows
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All the above
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Correct

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Question 18 of 19

18. Question

Walnut pruning wounds are susceptible to Bot/Phomopsis infection for about:

Four weeks
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Four months
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Not susceptible
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Question 19 of 19

19. Question

Which of the following are contributing factors to the Bot/Phomopsis disease:

Pruning wounds
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Sunburn
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Frost damage
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All the above
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Correct

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