Quiz 7: Chemical Control Strategies in Plant Pathology

Quiz 7 Due May 1 at 11:59pm Points 30 Questions 10 Available Apr 27 at 9:50am - May 1 at 11:59pm Time Limit None Allowed Attempts 3 Instructions Attempt History Attempt Time Score KEPT Attempt 3 less than 1 minute 30 out of 30 LATEST Attempt 3 less than 1 minute 30 out of 30 Attempt 2 2 minutes 30 out of 30 Attempt 1 12 minutes 18 out of 30  Correct answers are hidden. Score for this attempt: 30 out of 30 Submitted May 1 at 4:05pm This attempt took less than 1 minute. Quiz 7 Due Monday, May 1st (05/01) @ 11:59 PM This quiz covers chemical control + issues (lectures 24-25). The quiz has 10 questions, each worth 3 points for a total of 30 points . Everyone gets 3 attempts. Please, read each question carefully and answer to the best of your knowledge. 3 / 3 pts Question 1

A corn producer repeatedly applies fungicides with the same site- specific mode of action over a number of years to the same corn field to control a particularly destructive fungal pathogen. What might be an unintended outcome of this practice in respects to populations of a less destructive (minor) fungal pathogens existing in that same field? The fungicides would eradicate the minor pathogen from the field. The fungicide applications could cause the minor pathogen population to become resistant to the fungicides. The fungicide applications would ensure that disease caused by the minor pathogen would never become highly destructive. 3 / 3 pts Question 2 This is NOT a method in which pesticides reduce disease development: Reducing the viability of pathogens Reducing vector populations to inhibit transmission Enhancing/activating host defenses Inhibiting the growth of pathogen Reducing weed populations

3 / 3 pts Question 3 "Most pathogen-specific chemicals are effective at killing the target pathogen" True False 3 / 3 pts Question 4 Xylem-mobile fungicides are more likely to: Cause secondary damage to new shoots Contribute to host development Be more effective in the upper parts of the plant Store chemicals in the lower parts of the plant Remain in the plant for long periods of time Circulate to every cell of the plant including roots 3 / 3 pts Question 5 If a fungicide is "fungistatic" that means:

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Does not kill fungus Kills static fungi It will kill most fungal pathogens Kills bacteria and fungi It is a broad range fungicide Kills fungi at the base of the plant 3 / 3 pts Question 6 These types of fungicides are more likely to be effective over long periods of time: Fungistatic Penetrants Single site of action Multiple sites of action Broad range Curatives Seed treatments 3 / 3 pts Question 7

Which type to chemical pesticide is NOT available for controlling viral pathogens? Chemicals that are applied to plants to inhibit infection by viruses Chemicals that are applied to tools and equipment surface to inactivate viruses Chemicals that are applied to plants to control insect vectors of viruses Chemicals that are applied to weed plants to remove them as virus reservoirs 3 / 3 pts Question 8 Which type of fungicide would NOT be effective as a curative treatment, i.e, to suppress a fungal pathogen after it has penetrated into plant tissues? xylem-mobile fungicides Penetrant fungicides Contact fungicides Translaminar fungicides 3 / 3 pts Question 9

The DMI, QoI and SDHI fungicide groups are very different in respects to their modes of action. They do, however, have a number of characteristics in common. For each characteristic, select YES if it is common among the three fungicide groups, No if it is no common among the three groups. Moderate to high risk of fungi development insensitivity to the fungicide group YES Acts on multiple molecular targets in fungi NO Penetrates into and moves through plant tissues YES 3 / 3 pts Question 10 It is possible that after a fungicide is applied one time to a crop to suppress disease caused by a fungal pathogen, the disease might reappear and then reach a more severe level than if the fungicide wasn't used. What is a likely explanation for this phenomenon? The fungal pathogen became resistant to the fungicide The fungicide suppressed populations of beneficial fungi that are natural enemies of the pathogen.

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The fungicide predisposed the plants to infection causing them to be more susceptible to infection The fungicide was phytotoxic, causing wounds through which the pathogen was able to penetrate Quiz Score: 30 out of 30

Quiz 7_ PLANT PATHOGENS&DISEASE PLPT210 SEC 001 Spring 2023

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