Plant Pathology

Question 1

Plant pathology

Answer 1

The study of organisms or environmental factors that cause plant disease, the mechanisms by which they cause disease and the interactions between host and pathogen

Can store times include disease control

Question 2

Plant health

Answer 2

The ability to carry out normal physiological functions and reproduction consistent with the genetic potential

Question 3

Plant disease

Answer 3

The disruption of normal physiological function, biotic and abiotic factors

Question 4

Disease cycle

Answer 4

Inoculation, pre penetration, penetration, establish, colonisation, dissemination

Question 5

Innoculum

Answer 5

Primary- soil, root debris, crops, seeds

Secondary innoculum caused by primary infection

Question 6

Pre-penetration

Answer 6

Fungi- produce spores
Nematodes- hatching factors

Attachment
Viruses enter directly from vector
Fungi have penetration pegs
Bacteria have mucilage and fibrillar sheath for attachment

Question 7

Penetration

Answer 7

Direct- through root and wounds

Plants use hydrostatic pressure, fungi use penetration pegs.

Question 8

Dissemination

Answer 8

By environment
Specific vectors- flies, aphids, bees
Non specific vectors- farming tools, farm animals,

Question 9

Overwintering

Answer 9

Causes misshapen plant, necrosis and discolouration

Question 10

Koch’s postulates

Answer 10

Pathogen present in all diseased tissue
Pathogen must be cultured in lab or host
Pathogen must be transmissible and cause same symptoms
Pathogen must be re isolated from host and be genetically the same

Question 11

Exactions of postulates

Answer 11

Prions in CJD
A symptomatic carriers of cholera
Obligate parasites
Disease present in tissue, but doesn’t affect that tissue