What is true regarding host-plant resistance to nematode infestation?

Host-plant resistance to nematode infestation refers to the ability of certain plant varieties to withstand or repel nematodes, which are microscopic roundworms that can cause significant agricultural damage. The assertion that resistant plants are most effective when used with other techniques emphasizes the importance of an integrated pest management approach. Resistant varieties can help reduce nematode populations and damage; however, their effectiveness increases when combined with other strategies such as crop rotation, soil management practices, and chemical controls. This multi-faceted approach enhances overall plant health and reduces the likelihood of nematode resurgence.

Other options do not accurately represent the nature of host-plant resistance. For example, while resistant plants can significantly reduce nematode populations, they do not eliminate all pests. Additionally, the cost factor for nematode-resistant plants can vary based on multiple factors such as breeding efforts, market demand, and availability, so they are not necessarily always more expensive. Finally, host-plant resistance can be effective against a variety of nematodes, not just those that feed on the roots, as some resistant varieties have been developed to combat nematodes that affect other plant parts as well.