Virginia Commercial Pesticide Applicators CORE Exam

What is 'host resistance' in terms of IPM?

1. The ability of a plant to attract pests

2. The capability of a plant to withstand pests

3. The method of breeding plants to produce more pests

4. An indicator of pest population density

The correct answer is: The capability of a plant to withstand pests

Host resistance refers to the ability of a plant to withstand or tolerate the presence of pests, thereby minimizing damage and maintaining growth. Plants exhibiting host resistance have developed certain characteristics or innate traits that either deter pests or enhance the plant's ability to recover from pest damage. This can occur through various mechanisms, such as producing chemical repellents, having physical adaptations that make it more difficult for pests to feed or lay eggs, or developing a faster recovery process from pest attacks. In integrated pest management (IPM), the concept of host resistance is pivotal as it contributes to reducing the reliance on chemical pesticides. By selecting and utilizing resistant plant varieties, agricultural practices can promote sustainable pest management strategies that enhance crop resilience while minimizing potential negative impacts on the environment and non-target organisms.