MODULE 6

Question 1

___ represent pathogen biology as a series of
interconnected stages of development including dormancy, reproduction, dispersal, and pathogenesis.

Answer 1

Plant disease cycles

Question 2

What are the chain of events that are involved in disease development or different stages of disease cycle?

Answer 2

inoculation, penetration, infection, incubation,
reproduction, and survival.

Question 3

The spreading of the newly produced pathogen
reproductive organs to other uninfected crops is called ___

Answer 3

secondary inoculation.

Question 4

This describes the introduction of the plant pathogen to the host.

Answer 4

Inoculation

Question 5

Wound sites and natural plant openings, such as stomata and hydathodes, facilitate the entrance of some plant pathogens; others have evolved unique mechanisms for direct penetration. Fungi and nematodes are able to
actively penetrate host tissues and cells if environmental conditions, such as moisture and temperature, are favorable for the penetration process.

Answer 5

Penetration

Question 6

This occurs when the pathogen invades the plant tissue and establishes a parasitic relationship between itself and the plant.

Answer 6

Infection

Question 7

___represents the pathogen progression through stages
which is determined by a continuous sequence of interactions among host, pathogen, and environment.

Answer 7

Plant disease cycle