PLANT PATHOLOGY EXAM QUESTIONS
AND ANSWERS
symptoms - Answer-plant external and internal reactions to disease
signs - Answer-pathogen directly observable parts or products on the host plant
chlorosis - Answer-An abnormally yellow color of plant tissue, resulting from partial
failure to develop chlorophyll
witches broom - Answer-disease symptom characterized by an abnormal, massed,
brushlike development of many weak shoots arising at or close to a single point
Plant Pathology - Answer-nature, cause and control or management of plant disease
biotic diseases - Answer-caused by pathogens, are infectious and transmissible
abiotic diseases - Answer-chemical/physical damage, environmental factors, are not
infectious are are nontransmissible
disease triangle - Answer-susceptible host plant, virulent pathogen, conducive
environment
susceptible - Answer-lacking ability to resist infection
resistant - Answer-capable of impeding infection
immune - Answer-cannot be infected by a given pathogen
Most plants are immune to most pathogens - Answer-...
blight - Answer-a rapid and complete chlorosis, browning, then death of plant tissues
such as leaves, branches, twigs, or floral organs
fruit rot - Answer-necrosis on a fruit
wilt - Answer-causing to become limp or drooping
gall - Answer-abnormal swelling of plant tissue caused by insects or microorganisms or
injury
conducive environments - Answer-environments that favor pathogen and disfavor host
pathogen - Answer-organism capable of causing a disease in host plants
AND ANSWERS
symptoms - Answer-plant external and internal reactions to disease
signs - Answer-pathogen directly observable parts or products on the host plant
chlorosis - Answer-An abnormally yellow color of plant tissue, resulting from partial
failure to develop chlorophyll
witches broom - Answer-disease symptom characterized by an abnormal, massed,
brushlike development of many weak shoots arising at or close to a single point
Plant Pathology - Answer-nature, cause and control or management of plant disease
biotic diseases - Answer-caused by pathogens, are infectious and transmissible
abiotic diseases - Answer-chemical/physical damage, environmental factors, are not
infectious are are nontransmissible
disease triangle - Answer-susceptible host plant, virulent pathogen, conducive
environment
susceptible - Answer-lacking ability to resist infection
resistant - Answer-capable of impeding infection
immune - Answer-cannot be infected by a given pathogen
Most plants are immune to most pathogens - Answer-...
blight - Answer-a rapid and complete chlorosis, browning, then death of plant tissues
such as leaves, branches, twigs, or floral organs
fruit rot - Answer-necrosis on a fruit
wilt - Answer-causing to become limp or drooping
gall - Answer-abnormal swelling of plant tissue caused by insects or microorganisms or
injury
conducive environments - Answer-environments that favor pathogen and disfavor host
pathogen - Answer-organism capable of causing a disease in host plants
