This document discusses the significance of nematodes in international trade of agricultural commodities. It begins by outlining the aims of plant quarantine to prevent the introduction and spread of quarantine pests and regulate noxious weeds. It then provides examples of how nematodes have spread internationally through trade pathways. The document discusses India's Plant Quarantine Order of 2003 and amendments, which aims to facilitate trade while managing pest risks. It also outlines definitions, procedures, and the roles of various organizations in ensuring phytosanitary compliance for imports and exports.