Pest Resistance
Pest Resistance - Related Videos
06:52
Characterizing Herbivore Resistance Mechanisms: Spittlebugs on Brachiaria spp. as an Example
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Cited by 11 •
2011
This video explains mechanisms of host plant resistance to herbivory and demonstrates a no-choice test that estimates the relative contributions of antibiosis and tolerance to spittlebug resistance in Brachiaria spp.
08:24
Choice and No-Choice Assays for Testing the Resistance of A. thaliana to Chewing Insects
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Cited by 7 •
2008
Plant resistance to chewing insect herbivores can be tested in several ways. Here, we demonstrate how to set-up a choice and a no-choice experiment with the model plant Arabidopsis thaliana to identify resistance against the pest species Pieris rapae.
08:53
Application of Two-spotted Spider Mite Tetranychus urticae for Plant-pest Interaction Studies
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Cited by 61 •
2014
Protocols for efficient preparation of homogenous samples of spider mites, infestation of experimental plants, and assessment of plant damage, as required for studies of plant-pest interaction were developed.
01:22
Resistivity
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2023
When a voltage is applied to a conductor, an electrical field is generated, and charges in the conductor feel the force due to the electrical field. The current density that results depends on the electrical field and the properties of the material. In some materials, including metals at a given temperature, the current density is approximately proportional to the electrical field. In these cases, the current density can be modeled as: where σ is the electrical conductivity and is represented...
01:19
Resistance
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2023
When a current moves through any conductor, the conductor causes some level of difficulty for the current to flow. The measure of that difficulty is known as the resistance of the material and is represented by R. Every material has its own resistance. In the case of conductors, heat is emitted whenever a current passes through them. Resistance depends on the resistivity of the material. Resistivity is a characteristic of the material used to fabricate electrical components, whereas the...
FAQs
Selection changes the population, not necessarily each pest during its lifetime. A control measure removes more susceptible individuals, while those with resistance-associated traits remain available to reproduce. Across generations, this differential survival shifts the population toward resistance. The process therefore links pest resistance to genetic variation, inheritance, and population change rather than to a temporary response by individual pests.
Resistance-associated traits matter because survival alone does not guarantee that resistance becomes common. Surviving pests must reproduce and pass those traits to offspring. When this pattern occurs repeatedly, the frequency of resistance rises within the population. Biology therefore examines both the initial variation among pests and the inheritance of traits to explain why control effectiveness can decline.
Repeated or improper control use intensifies selection pressure. If the same approach consistently eliminates susceptible pests while leaving resistant ones, the survivors contribute disproportionately to later generations. This can make a once-effective measure less useful over time. The biological lesson is that control practices influence evolutionary outcomes, not merely immediate pest numbers.
Integrated pest management addresses resistance by combining chemical, biological, and cultural controls rather than relying on one approach alone. This broader strategy reduces the repeated selection imposed by a single control measure and helps delay further increases in resistance. It also supports crop protection while reducing environmental impacts and preserving effective long-term control.
Studying pest resistance informs decisions about maintaining control over time. Because resistance can increase through repeated selection, management must consider later generations as well as immediate reductions in pest numbers. Integrating chemical, biological, and cultural controls provides a way to protect crops while helping preserve the effectiveness of available measures.
Within biology, pest resistance provides a population-level example of evolution by natural selection. The topic connects inherited variation with differential survival and reproduction, then traces how those processes alter a population across generations. Its agricultural importance comes from applying that evolutionary perspective to crop protection, environmental impact, and the durability of control strategies.