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Community of weeds in a groundnut crop (Arachis hypogaea) and its relationship to the rat Sigmodon hirsutus in Alajuela, Costa Rica. We have characterized the weed community during a production cycle of peanut (Arachis hypogaea) and related it to the catch of the field rat (Sigmodon hirsutus). Four monthly samples of weeds were done, assessing the richness, diversity, coverage, height and plot density, biomass and phenological state. For the sampling of rodents, a grid with 40 traps spaced 10 m apart was used, during 2 consecutive nights per month. The weed community was composed of 22 species, through the cycle of peanut production. Ageratum conyzoides was present in all samples and was the dominant species of the weed community. Narrow-leaf species were present throughout the production cycle, with greater representation in the first sampling, although with less richness than the one shown in the last sampling. The occupation of S. hirsutus of an agroecosystem dominated by broadleaf species is recognized, which demonstrates its adaptability to different habitats, as it is a common species in agroecosystems dominated by narrow-leaf species.

Comunidad de arvenses en un cultivo de maní (Arachis hypogaea) y su relación con la rata Sigmodon hirsutus en Alajuela, Costa Rica