CRP001 (TERMINOLOGIES)

Question 1

an injurious process caused by the continued irritation of a primary causal agent causing abnormal physiological and cellular activity expressed in abnormal morphological characteristics called symptoms

Answer 1

Plant Disease

Question 2

any agent that cause disease which is generally referring to a living organism

Answer 2

Pathogen

Question 3

is an organism which depends wholly or partly on another living organism for its food

Answer 3

Parasite

Question 4

subsist on living organisms and attacks only living tissues (ex. Virus, rust fungi, downy mildew fungi, etc.)

Answer 4

Obligate Parasite

Question 5

An organism, which has the ability to become a parasite but is ordinarily a saprophyte.

Answer 5

Facultative Parasite

Question 6

an organism that lives on dead organic or inorganic matter

Answer 6

Saprophyte

Question 7

Has the ability to become a saprophyte but is ordinarily a parasite

Answer 7

Facultative Saprophyte

Question 8

refers to the plant that is being attacked by a parasite

Answer 8

Host

Question 9

a plant that is susceptible to a disease whether or not the pathogen is parasitic

Answer 9

Suscept

Question 10

is the capacity of a pathogen to cause disease

Answer 10

Pathogenicity

Question 11

series of events that lead to disease development in the plant

Answer 11

Pathogenesis

Question 12

refers to the quantitative amount of disease that a given pathogen can cause in a group of plants

Answer 12

Virulence

Question 13

measures the rate at which virulence is expressed by a given pathogenic isolate.

Answer 13

Aggressiveness

Question 14

The ability of an organism to overcome in any degree the effects of a pathogen

Answer 14

Disease Resistance

Question 15

is the opposite of resistance

Answer 15

Susceptibility

Question 16

is exhibited by a plant which is severely affected by a pathogen without experiencing a severe reduction in yield

Answer 16

Tolerance

Question 17

are the manifestation or expressions by the suscept/host of a pathologic condition

Answer 17

Symptoms

Question 18

are those that are the immediate and direct results of the causal
agent’s activities on the invaded tissues

Answer 18

Primary symptoms

Question 19

the effects on the distant and uninvaded plant parts

Answer 19

Secondary symptoms

Question 20

are characterized by distinct and very limited structural changes

Answer 20

Localized symptoms

Question 21

more generalized pathological conditions

Answer 21

Systemic symptoms

Question 22

is essentially internal, and seen only upon the dissection of the
diseased plant portion and examination under the microscope

Answer 22

Histological symptoms

Question 23

are those malformations and other changes that are visible to the naked eye

Answer 23

Morphological symptoms

Question 24

The various symptoms were categorized by Kenaga (1974) into: (7)

Answer 24

▪ Abnormal coloration
▪ Wilting
▪ Death of host tissue
▪ Defoliation and fruit drop
▪ Abnormal growth increase of host
▪ Stunting
▪ Replacement of host tissue