This dimension marks whether a pest or disease is currently under formal quarantine restriction. Wikipedia notes that invasive species have "become serious economic, social, and environmental threats worldwide," a threat level that is exactly why some are placed under strict quarantine control. Browsing by quarantine status separates regulated pests and diseases from those that are not.
Facts
Comparison
Typical Transmission or Damage Mode Quarantine Status
Sources
1. Wikipedia: Plant virus
WikipediaPlant virus, By insects sectionQuote, Plant virus, By insects section
Plant viruses need to be transmitted by a vector, most often insects such as leafhoppers.
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