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In Mexico, an increase in the introduction and dissemination of quarantined weeds can be observed, which can cause million-dollar economic damage to agriculture, as new crop control measures are required. The objective of the study was to determine the distribution and population density of Rottboellia cochinchinensis (hairy grass) in the state of Morelos and thus know the time of greatest spread with references to environmental conditions and thereby assess the most appropriate time to control or eradicate the hairy grass, before it can reproduce. The study was conducted from January 1 to December 31, 2015, in the agricultural areas of the 33 municipalities of the state of Morelos, where they were sampled to identify the presence of R. cochinchinensis. Once the existence of hairy grass in the municipalities was identified, each month the municipalities with presence were monitored to determine population density. The municipalities with the densest population were Jantetelco, Jonacatepec, Tepalcingo and Xochitepec. The highest population density occurred in the months of July and August after observing the highest rainfall, so it is important to apply control technique on Rottboellia cochinchinensis before the period mentioned between the months of May and June.

Distribución y densidad de Rottboellia cochinchinensis (Lour.) Clayton en el estado de Morelos