PCA Plant Pathogens Exam 2025 – Exam Questions and Correct Answers | Complete Exam Preparation Material

PCA - Plant Pathogens Exam with
Questions and Correct Answers 2025



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 ,disease ,- ,CORRECT
,ANSWER-viroids ,and ,viruses


a ,non ,obligate ,parasite ,- ,CORRECT ,ANSWER-can ,live ,on ,either ,a ,living ,or ,a ,dead
,hosts


koch ,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-wouldn't ,occur ,under ,existing ,environmental
,conditions


which ,of ,the ,following ,factors ,affects ,epidemics ,- ,CORRECT ,ANSWER-the ,virulence
,of ,the ,pathogens

, dominant ,environmental ,factor ,in ,development ,in ,most ,epidemics ,caused ,by ,fungi ,is ,-
,CORRECT ,ANSWER-moisture


in ,addition ,to ,host ,pathogen ,and ,environment ,another ,component ,that ,affects ,the
,development ,of ,an ,epidemic ,is ,- ,CORRECT ,ANSWER-the ,age ,of ,the ,host ,plants


which ,type ,of ,pathogen ,decimation ,method ,is ,responsible ,for ,most ,frequent ,and ,most
,wide ,spread ,plant ,disease ,epidemics ,- ,CORRECT ,ANSWER-air ,borne


most ,soil ,born ,diseases ,are ,- ,CORRECT ,ANSWER-single ,cycled ,diseases

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