Question:
Which of the following pathogen developmental structures is capable of accelerating explosive epidemics in agricultural crops?
Which of the following pathogen developmental structures is capable of accelerating explosive epidemics in agricultural crops?
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Conidia and repeating spores (urediniospores) drive polycyclic explosive epidemics; Sclerotia and Chlamydospores serve for survival.
Updated On: Sep 15, 2026
- Asexually produced conidia
- Sexually produced spores
- Chlamydospores
- Sclerotium
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Polycyclic plant pathogens produce secondary repeating propagules that drive compound-interest epidemic growth during a single cropping season.
Step 2: Detailed Explanation:
Asexually produced conidia/spores (e.g., urediniospores of rusts, conidia of powdery mildews and blast) are produced in astronomical numbers in short generation cycles ($7\text{--}10\,\text{days}$).
Dispersed efficiently by wind and rain, repeated cycles of secondary infection accelerate explosive geometric/logarithmic disease epidemics in crop canopies.
In contrast, sexual ascospores, thick-walled chlamydospores, and sclerotia function primarily as primary inoculum and overwintering survival structures.
Step 3: Final Answer:
Thus, asexually produced conidia drive explosive epidemics.
Polycyclic plant pathogens produce secondary repeating propagules that drive compound-interest epidemic growth during a single cropping season.
Step 2: Detailed Explanation:
Asexually produced conidia/spores (e.g., urediniospores of rusts, conidia of powdery mildews and blast) are produced in astronomical numbers in short generation cycles ($7\text{--}10\,\text{days}$).
Dispersed efficiently by wind and rain, repeated cycles of secondary infection accelerate explosive geometric/logarithmic disease epidemics in crop canopies.
In contrast, sexual ascospores, thick-walled chlamydospores, and sclerotia function primarily as primary inoculum and overwintering survival structures.
Step 3: Final Answer:
Thus, asexually produced conidia drive explosive epidemics.
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