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Plant Pathology Exam Questions and Answers: A Comprehensive Review, Exams of Botany and Agronomy

School of Professional Horticulture at the New York Botanical GardenBotany and Agronomy

A valuable resource for students studying plant pathology. It presents a series of multiple-choice questions and answers covering various aspects of plant diseases, including disease cycles, pathogen identification, management strategies, and the role of environmental factors. the questions delve into key concepts such as pathogen races, incubation periods, disease symptoms, and control methods, making it an excellent tool for exam preparation and knowledge reinforcement. The detailed answers offer insights into the complexities of plant pathology, enhancing understanding and retention.

Typology: Exams

2024/2025

Available from 04/29/2025

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PCA PLANT PATHOGENS EXAM 2025 | ALL
QUESTIONS AND CORRECT ANSWERS |
NEWEST EXAM | GRADED A+ | VERIFIED
ANSWERS (JUST RELEASED)
Serious epidemics are more likely to occur from a multiple cycled disease
rather than a single cycled disease because ---------CORRECT ANSWER---
--------------multiple cycled diseases produce secondary inoculum that can
cause secondary infections
Sanitation practices are often a more effective management tool for single
cycled diseases then multi cycled diseases because ---------CORRECT
ANSWER-----------------in a single cycled disease the primary incoculum is
the only inocuclum available for the entire season
A race of a pathogen refers to ---------CORRECT ANSWER-----------------a
group of pathogens within a species that infects only certain varieties of a
host plant
The time between host penetration and the first appearance of symptoms is
called the ---------CORRECT ANSWER-----------------incubation period
A mushroom is an example of a ---------CORRECT ANSWER-----------------
basidocarp
Most fungal disease that attack flowers are favored by ---------CORRECT
ANSWER-----------------wet weather
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Download Plant Pathology Exam Questions and Answers: A Comprehensive Review and more Exams Botany and Agronomy in PDF only on Docsity!

PCA PLANT PATHOGENS EXAM 2025 | ALL

QUESTIONS AND CORRECT ANSWERS |

NEWEST EXAM | GRADED A+ | VERIFIED

ANSWERS (JUST RELEASED)

Serious epidemics are more likely to occur from a multiple cycled disease rather than a single cycled disease because ---------CORRECT ANSWER--- --------------multiple cycled diseases produce secondary inoculum that can cause secondary infections Sanitation practices are often a more effective management tool for single cycled diseases then multi cycled diseases because ---------CORRECT ANSWER-----------------in a single cycled disease the primary incoculum is the only inocuclum available for the entire season A race of a pathogen refers to ---------CORRECT ANSWER-----------------a group of pathogens within a species that infects only certain varieties of a host plant The time between host penetration and the first appearance of symptoms is called the ---------CORRECT ANSWER-----------------incubation period A mushroom is an example of a ---------CORRECT ANSWER----------------- basidocarp Most fungal disease that attack flowers are favored by ---------CORRECT ANSWER-----------------wet weather

Fungi penetration the host plant by directly penetration of --------- CORRECT ANSWER-----------------open wounds Obligate fungal parasites ---------CORRECT ANSWER-----------------are unable to feed on dead cells At times it is difficult to determine the casual agent of a disease because various agents result in similare symptoms. which of the following symptoms are similare ---------CORRECT ANSWER-----------------wilts (verticillium and fusarium) Bacterial plant pathogens are ---------CORRECT ANSWER----------------- prokaryotes Bacterial canker in tomatoes is commonly spread by all of the following execpt? ---------CORRECT ANSWER-----------------leaf hoppers Environmental conditions that commonly favor the development of bacterial blights are ---------CORRECT ANSWER-----------------warm and humid conditions Plant pathenogenic phytoplasims in bacteria are ---------CORRECT ANSWER-----------------prokaryotes

Destoryed overwintering host plants or alternative host crops is a variable method of reducing disease inoculum for ---------CORRECT ANSWER------- ----------pathogens with a limited host range Providing good soil drainage can reduce the amount of seedling infection caused by ---------CORRECT ANSWER-----------------damping off To reduce the inidence of infection by phyapithium ---------CORRECT ANSWER-----------------avoid excess nitrogen fertilizers The verticillium inoculum population in the field can be reduced by --------- CORRECT ANSWER-----------------rotating an unacceptable crop 3 to 4 years Which of the following practices is an example of sanitation --------- CORRECT ANSWER-----------------selectively removing mummified fruit from over wintering in trees Pruning fire blight out of trees in the summer ---------CORRECT ANSWER-- ---------------all of the above Which of the following disease can be reduced by the removal of an alternate host ---------CORRECT ANSWER-----------------white pine blister rust

Antagonistics are ---------CORRECT ANSWER-----------------organisms that inhibit the growth for reproduction of a plant pathogen Successful biological control is avialable for which bacterial disease --------- CORRECT ANSWER-----------------crown gall Most effective way to use soil solarization to kill soil borne pathogens is to place ---------CORRECT ANSWER-----------------clear polyethane plastic over moist soil Fumigants effectively control soil borne diseases because --------- CORRECT ANSWER-----------------in a gaseous state they diffuse easily through the soil Sanitation of storage warehouses ---------CORRECT ANSWER----------------- is important for control of post harvest diseases Which of the following would be a viable method to control plant viruses that are vectored by insects ---------CORRECT ANSWER-----------------use vector free plant protocols To guarantee proper coverage of a plant material when making a fungicide application ---------CORRECT ANSWER-----------------calibrate the equipment to deliver the recommended rate

to accurately identify fungi? ---------CORRECT ANSWER----------------- examine their spores and spore boaring structure symptomes resulting from infection by stafercock include ---------CORRECT ANSWER-----------------reduced flower production of roses stem rust fungi such as those causing stem rust of wheat require which of the following to complete their life cycle? ---------CORRECT ANSWER------- ----------need alternate host like barberry bushes plant pathogens can be ---------CORRECT ANSWER-----------------a factor in integrated pest management for controlling insects and mites powdery mildews are caused by ---------CORRECT ANSWER----------------- funguses which of the following is a sign of a disease ---------CORRECT ANSWER---- -------------white mycelium on twigs and fruit some abiotic factors that cause plant disease are ---------CORRECT ANSWER-----------------air pollutants which of the following biotic factors contribute to plant diesease --------- CORRECT ANSWER-----------------viroids and viruses

a non obliate parasite ---------CORRECT ANSWER-----------------can live on either a living or a dead hosts kotch postulates are readily implemented for ---------CORRECT ANSWER-- ---------------fungi an example of human impact in the development in plant disease is --------- CORRECT ANSWER-----------------the use of preventative fungicide applications anthracnose diseases cannot occur without ---------CORRECT ANSWER---- -------------the presence of the pathogen in the soil the use of pathogen free propagated material ---------CORRECT ANSWER- ----------------only helps if environmental conditions favorable for disease development are not present plant disease triangle is used for the diagnosis because it allows you to discount disease that ---------CORRECT ANSWER-----------------wounldn't occur under existing environmental conditions which of the following factors affects epidemics ---------CORRECT ANSWER-----------------the virulence of the pathogens

leaf hoppers are good at transmitting factidious vascular bacteria because they ---------CORRECT ANSWER-----------------feed in the xylem tissues where bacteria are present symptoms of pierce disease in grapes include ---------CORRECT ANSWER-----------------dry leaf margins phytoplsm's ---------CORRECT ANSWER-----------------all of the above common vectors involved in phytoplasmas caused diseases include --------- CORRECT ANSWER-----------------leaf hoppers symptoms of aster yellows include ---------CORRECT ANSWER----------------

  • all of the above viruses ---------CORRECT ANSWER-----------------are nuclear proteins virus;s symptoms include ---------CORRECT ANSWER-----------------all of the above which of the following can be used to detect a viral pathogen --------- CORRECT ANSWER-----------------electron microscope

which of the following viruses is not transmitted by aphids --------- CORRECT ANSWER-----------------beet curly top gemini virus grape fan leaf virus ---------CORRECT ANSWER-----------------reduces fruit production lettuce mosaic potyvirus ---------CORRECT ANSWER-----------------has a very wide host range what is one of the most stable viruses that is easily trasnmitted mechanically and becomes problematic with poor green house sanitaiion? - --------CORRECT ANSWER-----------------tobacco mosaic virus what is the difference between dwarf mistletoe and leafy mistletoe --------- CORRECT ANSWER-----------------dwarf attacks only conifers and leafy mistletoe attacks many wooden species symptoms of plants suffering from a lack of moisture include all the following except ---------CORRECT ANSWER-----------------stem cankers numerous small bumps on the lower sides of leaves or on stems is a common symptom of ---------CORRECT ANSWER-----------------edema

what is the common name of the disease that affect the plant parts in the photograph ---------CORRECT ANSWER-----------------late blight of potatoes what pathogen causing the disease in the photograph is a --------- CORRECT ANSWER-----------------fungus (club root) common name for this disease is called ---------CORRECT ANSWER--------- --------club root the above photograph show plant roots that are exhibiting the blank of a disease ---------CORRECT ANSWER-----------------symptom clumped distribution of a plant disease in a field can be attributed too --------

  • CORRECT ANSWER-----------------a root pathogen spreading from an initial infection site crop rotation is important control measure for ---------CORRECT ANSWER- ----------------soil borne pathogens with a limited host range when collecting samples to send to a lab for disease confirmation --------- CORRECT ANSWER-----------------label samples with the crop name soil type and the date disease forcasting ---------CORRECT ANSWER-----------------all of the above