When certain cultivars demonstrate resistance while others remain susceptible when challenged by the identical insect biotype, this interaction is termed___________________?
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Answer: B. Specific resistance
Explanation
Specific resistance occurs when certain plant cultivars show strong resistance while others remain susceptible to a particular insect biotype. This interaction highlights genetic compatibility differences between specific host plant lines and insect strains. Plant breeders exploit specific resistance traits to develop crop varieties protected against dominant regional pests. Host plant resistance mechanisms can be governed by single major genes or complex polygenic inheritance systems. Insect biotypes evolve virulence factors that can overcome specific resistance traits bred into agricultural crops. Evaluating cultivar responses under controlled infestations helps identify durable resistance sources for breeding.
Deploying resistant crop cultivars is a cost-effective strategy for managing insect pests in sustainable farming. Agricultural seed companies screen new lines against prevalent biotypes to ensure reliable field performance. Understanding specific resistance interactions helps prevent widespread crop failures caused by virulent pest strains. General resistance involves broad polygenic defense mechanisms effective against multiple insect biotypes. Cross resistance occurs when resistance to one pesticide confers resistance to another chemical class. Horizontal resistance provides quantitative protection distributed across many minor genes rather than specific biotypes.
- Subject
- Agriculture
- Category
- Agriculture
- Topic
- —
- Difficulty
- medium
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