INTERNATIONAL RICE RESEARCH INSTITUTE (IRRI)
In South and Southeast Asia, over 1,800 weed species grow in association with rice, more than are recorded for any other crop.
Moody, Keith · 1970

Abstract
This document provides a comprehensive survey of rice weeds that have been reported to occur in 15 South and Southeast Asian countries. In Section I, the weeds are listed alphabetically; genus, species, family, and country(ies) of occurrence are given for each. Section II lists weeds by country, and identifies the type of rice culture (e.g., lowland, tidal swamp) in which each weed occurs. Finally, Section III lists weeds by five rice cultures (deep-water, dry-seeded, transplanted, upland, and wet-seeded), giving the weed type and affected countries. References are provided.
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Classification