EPP 4113/6113 Exam 2 UPDATED
ACTUAL QUESTIONS AND CORRECT
ANSWERS
What are the 4 purposes of Koch's postulates? - CORRECT ANSWER - Find causal function of
pathogen for disease development
- Assess resistance of cultivars to disease
- Test variation of pathogenicity of pathogens
- Detect host range of a pathogen
What are 4 common inoculation methods? - CORRECT ANSWER - Root inoculation
- Stem inoculation
- Fruit or root tuber inoculation
- Leaf inoculation
What group of pathogens are Zygomycetes known for? - CORRECT ANSWER Soft rots
What group of pathogens are Ascomycetes known for? - CORRECT ANSWER Sac fungi and
diseases
Where do the sporangiospores emerge from for Downy Mildew? - CORRECT
ANSWER Stomata on underside of leaves
What type of pathogen is Blue mold of tobacco? - CORRECT ANSWER Type of downy
mildew
How are the 2 categories of Downy Mildew categorized? - CORRECT ANSWER By their
symptoms
What are the symptoms of DM type 1? - CORRECT ANSWER Chlorosis and lesions
,What are the symptoms of DM type 2? - CORRECT ANSWER Abnormality and chlorosis
Do DM type 1 pathogens infect monocots or dicots? - CORRECT ANSWER Dicots
Do DM type 2 pathogens infect monocots or dicots? - CORRECT ANSWER Monocots
Why can't DM pathogens produce necrotic spots? - CORRECT ANSWER Because they can
only reproduce on living tissue
What is an example of DM type 2 abnormality? - CORRECT ANSWER Flower lemma
becoming leaves
What is the most important part of a DM pathogen for identification? - CORRECT
ANSWER Sporangiophore characteristics
How wide is the DM host range? - CORRECT ANSWER Limited
Can DM pathogens infect below ground parts of plants? - CORRECT ANSWER No
Why can DM pathogen not be saprophytic? - CORRECT ANSWER Because they can only
reproduce on living tissue
What environmental conditions do DM pathogens prefer? - CORRECT ANSWER Moist, cool
conditions
What is the feeding characteristic of DM? - CORRECT ANSWER Obligate parasite, never
saprophyte
What parts of a plant do DM pathogens attack? - CORRECT ANSWER Above ground parts,
especially young tissues and foliage
, Where do the hyphae of DM pathogens grow (Inter- or intra- cellularly)? - CORRECT
ANSWER Intercellularly; between cells
How are DM asexual spores dispersed for secondary infection? - CORRECT ANSWER Wind
and water
What is the sexual spore of DM? - CORRECT ANSWER Oospore
Where do DM oospores overwinter? - CORRECT ANSWER Decaying leaves on ground
What are the most resistant varieties for DM of grape? - CORRECT ANSWER American
varieties, but still not perfectly resistant
What are the features of the Bordeax mixture to control DM? - CORRECT ANSWER Copper
sulfate and lime (calcium oxide)
What is the asexual spore of Zygomycota? - CORRECT ANSWER Sporangiospore
What is the asexual spore of Ascomycota? - CORRECT ANSWER Conidium
What is the asexual spore of Basidiomycota? - CORRECT ANSWER Uredospore or teliospore
What is the asexual spore of Deuteromycota? - CORRECT ANSWER Conidium
What is the only phylum of pathogens that do not have sexual spores? - CORRECT
ANSWER Deuteromycota
When do Zygomycete infections typically occur? - CORRECT ANSWER Post harvest
What are the 2 main genera of Zygomycetes? - CORRECT ANSWER Rhizopus and Mucor
ACTUAL QUESTIONS AND CORRECT
ANSWERS
What are the 4 purposes of Koch's postulates? - CORRECT ANSWER - Find causal function of
pathogen for disease development
- Assess resistance of cultivars to disease
- Test variation of pathogenicity of pathogens
- Detect host range of a pathogen
What are 4 common inoculation methods? - CORRECT ANSWER - Root inoculation
- Stem inoculation
- Fruit or root tuber inoculation
- Leaf inoculation
What group of pathogens are Zygomycetes known for? - CORRECT ANSWER Soft rots
What group of pathogens are Ascomycetes known for? - CORRECT ANSWER Sac fungi and
diseases
Where do the sporangiospores emerge from for Downy Mildew? - CORRECT
ANSWER Stomata on underside of leaves
What type of pathogen is Blue mold of tobacco? - CORRECT ANSWER Type of downy
mildew
How are the 2 categories of Downy Mildew categorized? - CORRECT ANSWER By their
symptoms
What are the symptoms of DM type 1? - CORRECT ANSWER Chlorosis and lesions
,What are the symptoms of DM type 2? - CORRECT ANSWER Abnormality and chlorosis
Do DM type 1 pathogens infect monocots or dicots? - CORRECT ANSWER Dicots
Do DM type 2 pathogens infect monocots or dicots? - CORRECT ANSWER Monocots
Why can't DM pathogens produce necrotic spots? - CORRECT ANSWER Because they can
only reproduce on living tissue
What is an example of DM type 2 abnormality? - CORRECT ANSWER Flower lemma
becoming leaves
What is the most important part of a DM pathogen for identification? - CORRECT
ANSWER Sporangiophore characteristics
How wide is the DM host range? - CORRECT ANSWER Limited
Can DM pathogens infect below ground parts of plants? - CORRECT ANSWER No
Why can DM pathogen not be saprophytic? - CORRECT ANSWER Because they can only
reproduce on living tissue
What environmental conditions do DM pathogens prefer? - CORRECT ANSWER Moist, cool
conditions
What is the feeding characteristic of DM? - CORRECT ANSWER Obligate parasite, never
saprophyte
What parts of a plant do DM pathogens attack? - CORRECT ANSWER Above ground parts,
especially young tissues and foliage
, Where do the hyphae of DM pathogens grow (Inter- or intra- cellularly)? - CORRECT
ANSWER Intercellularly; between cells
How are DM asexual spores dispersed for secondary infection? - CORRECT ANSWER Wind
and water
What is the sexual spore of DM? - CORRECT ANSWER Oospore
Where do DM oospores overwinter? - CORRECT ANSWER Decaying leaves on ground
What are the most resistant varieties for DM of grape? - CORRECT ANSWER American
varieties, but still not perfectly resistant
What are the features of the Bordeax mixture to control DM? - CORRECT ANSWER Copper
sulfate and lime (calcium oxide)
What is the asexual spore of Zygomycota? - CORRECT ANSWER Sporangiospore
What is the asexual spore of Ascomycota? - CORRECT ANSWER Conidium
What is the asexual spore of Basidiomycota? - CORRECT ANSWER Uredospore or teliospore
What is the asexual spore of Deuteromycota? - CORRECT ANSWER Conidium
What is the only phylum of pathogens that do not have sexual spores? - CORRECT
ANSWER Deuteromycota
When do Zygomycete infections typically occur? - CORRECT ANSWER Post harvest
What are the 2 main genera of Zygomycetes? - CORRECT ANSWER Rhizopus and Mucor
