Explanation:

Less-developed countries and other countries in transition are especially vulnerable to  the damaging effects of exotic pest introductions because of often inadequate infrastructure and the fragility of their economies.
Plant quarantine is a technique for ensuring disease- and pest-free plants, whereby a plant is isolated while tests are performed to detect the presence of a problem.
It is crucial to prevent the introduction of non-indigenous, potentially damaging pests and diseases of plants into a country or to eradicate them before they can become widespread and well established.