1.      For activity 1

1.1.  What is the shape of the DPC of cultivar Amarilis with no fungicide (Figure A)? How about the DPC in the treatment with fungicide? Just by looking at these DPCs, which epidemic descriptor would you use to summarize these epidemics, AUDPC or r? Why?

         Suggested answer.

1.2.  What  was the frequency of the severity readings? In your opinion, how was the weather during the experiment?

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1.3.  How many disease readings were made during the experiment? Were the epidemics truncated when one of the treatments reached 100%? In your opinion, what was the purpose of the experiment?

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1.4.   Was it necessary to calculate relative AUDPC in these epidemics? Why?

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2.          For activity 2

2.1.  When is it critical to calculate relative AUDPC?

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2.2.  Explain in your own words the concept of relative AUDPC.

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3.          For activity 3

3.1. In the Scenario 1, it is evident that cultivar Amarilis is more resistant than cultivar Tomasa (Figure C). However, the descriptor r of cultivar Tomasa is very close to that of cultivar Amarilis (Figure I). Why?

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3.2.  In the Scenario 2, the epidemics were truncated when the susceptible cultivar reached its peak. What was the purpose of doing that?

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3.3.  In the Scenario 3, what are the implications of delaying the first evaluation of severity?

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3.4.  Under what conditions would you recommend the method to evaluate severity described in Scenarios 4 and 5?

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