Plant Pathology

Question 1

What are the factors of the disease triangle?

Answer 1

1) a susceptible host plant,
2) a pathogenic agent (like a fungus or bacteria)
3) a conducive environment

Question 2

Disease symptoms include:

Answer 2

Defoliation, stunting, wilting (all of these)

Question 3

If a pesticide controls a plant pathogen, at what point in the disease lifecycle must the appropriate product be applied to achieve the most effective control?

Answer 3

Before plant symptoms appear/ as a preventive

Question 4

Which of the following is a parasitic seed plant with orange tendrils?

Answer 4

Dodder

Question 5

The term symptom always refers to a visible change in the plant, whereas the term sign refers to visible evidence of the pathogen. Which of the following would NOT be considered a symptom?

Answer 5

a leaf has a coating of a white fungus

Question 6

Abiotic plant diseases can be caused by which of the following?

Answer 6

Abiotic plant diseases can be caused by which of the following?

Question 7

Fungi draw their sustenance from

Answer 7

other living organisms

Question 8

Water molds are fungi that depend on wet conditions for growth and reproduction. Two very important diseases named for the genera of the water molds that cause them are

Answer 8

Pythium/ Phytophthora

Question 9

. What are the optimum conditions for powdery mildew development?

Answer 9

warm days and cool, humid nights

Question 10

What are characteristics of bacteria

Answer 10

Bacteria reproduce by splitting into two halves
Bacteria invade plants through wounds and natural openings
Bacteria can survive in soil (in some cases)