ISHS Acta Horticulturae 502: II WOCMAP Congress Medicinal and Aromatic Plants, Part 3: Agricultural Production, Post Harvest Techniques, Biotechnology
PREEMERGENT CONTROL OF ANNUAL WEEDS IN OREGANO (ORIGANUM VULGARE L.) |
| Authors: | G. Zumelzú, C. Darré, R.J. Novo, R.E. Bracamonte |
| Keywords: | Chemical control, herbicides, selectivity |
| Abstract:
Experiments were conducted at Rio Primero, Province of Córdoba, Argentina, during 1996 and 1997, to determine efficiency of chemical control for annual weeds in fields of oregano (Origanum vulgare L.) with different herbicides. The assays were performed on preplanted crops grwn in loam sandy soil. The predominant weeds were "mostacilla" (Sisymbrium irio L) and "quinoa" (Chenopodium album L.), less prominent were "nabo" (Raphanus sativus L.), "quimpe" (Coronopus didymus (L.) Smith), “sanguinaria” (Polygonum aviculare L.), “ortiga mansa” (Lamium amplexicaule L.), “apio cimarrón” (Apium leptophyllum (Pers.) F. Muell.), “capiqui” (Stellaria media (L.) Villars), “estrellita” (Bowlesia incana R. et P.) and “cardo pendiente” (Carduus nutans L.). The following herbicides and doses were used: at preplantation, trifluralin 0.96 kg i.a./ha and pendimethalin 0.99 kg/ha; at postplantation, prometryn 1.5 kg/ha, linuron 1.00 kg/ha; lenacil 0.8 kg/ha and pyridate 1.125 kg/ha. The assays were done in random in blocks with four repetitions and control plots untreated. The plots were formed by five 10 m length rows separated at 0.70 m. The control efficiency was evaluated by recounting weed numbers and visual control percentage at days 21 and 49 postplantation. The phytotoxic effect on the crop was evaluated by recounting sprouted plants and estimating damage symptoms according to a 0 to 100% degree. The results indicated that at preplantation trifluralin and pendimethalin yielded a reasonable weed control; trifluralin performed better. At postplantation, prometryn was better than linuron, lenacil, and pyridate during both years in controlling weeds. None of the herbicides assayed significantly reduced the number of plants produced at transplantation; moreover, the number of oregano plants was similar or higher than that of the control. Neither symptoms of phytotoxicity nor yield decrease were observed. | |
Download Adobe Acrobat Reader (free software to read PDF files) | |
