Exam 1

Question 1

What are the 6 pathogens?

Answer 1

Fungi
Fungal-like organisms-Oomycetes
Bacteria 
Viruses
Nematodes 
Parasitic plants

Question 2

What two ways do you diagnose plant diseases?

Answer 2

Symptoms & Signs

Question 3

What is a symptom?

Answer 3

A reaction by the host

Question 4

What is a sign?

Answer 4

Direct observation of a pathogen

Question 5

Example of localized symptom?

Answer 5

Leaf spot

Question 6

Example of systemic symptom?

Answer 6

Stunting

Question 7

What are the 5 types of symptoms?

Answer 7

Necrosis
Secretions of liquids 
Discoloration 
Malformation 
Wilt

Question 8

Bacterial streaming is an _________

Answer 8

Sign

Question 9

What are the 3 things required for a disease to take place?

Answer 9

Pathogen, host, environment

Question 10

What are the three factor affecting host susceptibility?

Answer 10

Genetic predisposition
Growth stage
Stress

Question 11

Host range is the __________ that a pathogen can infect

Answer 11

Species

Question 12

What are the 2 types of pathogens?

Answer 12

Virulent

Avirulent

Question 13

A virulent pathogen is ______________ of infecting a host.

Answer 13

Capable

Question 14

An avirulent pathogen is ______________ of infecting a host

Answer 14

Incapable

Question 15

__________ __________ can be transmitted from host to host and cause Infectious

Answer 15

Biotic agents (pathogens)

Question 16

___________ _________-UV, ozone, nutrient imbalance

Answer 16

Abiotic agents

Question 17

_____________ ________=not “contagious

Answer 17

Noninfectious diseases

Question 18

3 types of Pathogens classified by dependence on host a are ________________, ________________, and ________________.

Answer 18

Biotrophs, Hemibiotrophs, and Necrotrophs

Question 19

_____________ obtain nutrients (food) only from living cells.

Answer 19

Biotrophs

Question 20

What is a disease causing agent?

Answer 20

Pathogen