PCA - PLANT PATHOGENS EXAM QUESTIONS AND ANSWERS 2025

PCA - PLANT PATHOGENS 2025
EXAM
ANSWER ALL QUESTIONS IN THIS SECTION



QUESTION 1



Beet curly top geminivirus disease - ANSWERS-Curly top disease



QUESTION 2



Beet curly top geminivirus vector - ANSWERS-Leafhoppers



QUESTION 3



Beet curly top geminivirus symptoms - ANSWERS-Dwarfing, rolling, yellowing
of upper leaves, leaves have yellow margins and become twisted, veins of outer
leaflets remain green



QUESTION 4



Beet curly top geminivirus host range - ANSWERS-potatoes, cucurbits, sugarbeet




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, PCA - PLANT PATHOGENS 2025
EXAM


QUESTION 5



Beet curly top geminivirus control - ANSWERS-Monitoring and treatment for beet
leafhopper, treatment of leafhopper by growers not recommended



QUESTION 6



Cucumber mosaic cucumovirus disease - ANSWERS-Cucumber mosaic



QUESTION 7



Cucumber mosaic cucumovirus vector - ANSWERS-Aphids



QUESTION 8



Cucumber mosaic cucumovirus symptoms - ANSWERS-Clearing of veins, mosaic
pattern, leaf growth retarded, malformed fruit




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, PCA - PLANT PATHOGENS 2025
EXAM
QUESTION 9



Cucumber mosaic cucumovirus host range - ANSWERS-cucurbits, spinach,
peppers

QUESTION 10



Cucumber mosaic cucumovirus control - ANSWERS-mulches that may repel
aphids, control largely not done



QUESTION 11



Beet necrotic yellow vein furovirus disease - ANSWERS-Rhizomania of
sugarbeets



QUESTION 12



Beet necrotic yellow vein furovirus vector - ANSWERS-Polymyxa betae
(soilborne fungus)



QUESTION 13



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, PCA - PLANT PATHOGENS 2025
EXAM
Beet necrotic yellow vein furovirus symptoms - ANSWERS-Root stunting,
proliferation of lateral rootlets, distorted vascular tissue, pale yellowing of leaves,
leaf wilt




QUESTION 14



Beet necrotic yellow vein furovirus host range - ANSWERS-Sugarbeet



QUESTION 15



Beet necrotic yellow vein furovirus control - ANSWERS-Plant rhizomania-
resistant cultivars, avoid planting sugarbeets 2 years in a row



QUESTION 16



Grape fanleaf nepovirus disease - ANSWERS-Grapevine fanleaf



QUESTION 17


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