Resumo

BANDA S., LAGUANDIO; FUENTES, CILIA LEONOR  e  CHAVES, BERNARDO. Producción de semilla de cilantro (Coriandrum sativum L.) bajo la incidencia de malezas y Alternaria NeesCoriander (Coriandrum sativum L.) seed production under weed and Alternaria Nees incidence. rev.colomb.cienc.hortic. [online]. 2011, vol.5, n.2, pp.279-294. ISSN 2011-2173.

The damage caused by weeds, Alternaria fungus and insect pests on the production of coriander seed was studied. The present research evaluated the attributes of weeds (species, frequency, cover and density), incidence and severity of Alternaria, insect pest, dry matter and yield in coriander seed. There were significant differences for the evaluated variables between intensities (high, medium, low and no control) of weed and Alternaria management. The weed community was composed of 15 species: lowest frequency Penisetum clandestinum (9%) and highest Lolium temulentum (91%). L. temulentum had the highest density (541 individuals/m²). The densities of monocotyledonous and dicotyledonous weed species with high control registered between one and four plants/m². Alternaria affected coriander at day 50 after sowing and produced severe damage when no control was taken; with 65% infected plants and a level of severity of total plant death. When intensive control measures of Alternaria were taken, the levels of incidence and severity stayed near 1.5 % with very slight damage. Coriander dry matter had a reduction of 82% due to Alternaria without any control measures and 92% with no weed control, compared to the control. The production of coriander seeds was between 167.1 and 174.3 g m^-2 with a minimal presence of weeds and Alternaria, and the absence of insect pests. No seed was obtained without weed control and without control of Alternaria, seed yield was 7.5 g m^-2.

Palavras-chave : management intensities; weed cover; weed density; disease severity.

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