INVENTORY OF GLYPHOSATE TOLERANT AND RESISTENT WEEDS IN A SOYBEAN AREA FROM NORTHWESTERN ARGENTINA (SALTA)

LOZANO EC, ZAPATER MA, DELGADO A.

Tafí del Valle, Tucumán, Argentina

Jornada; XXXIII ANNUAL SCIENTIFIC MEETING; 2016

TUCUMAN BIOLOGY ASSOCIATION

Investigations on weeds in cultures in northwestern Argentina exist though taxonomic information on tolerant and resistant weeds affecting soybean is still scarce. The object of this work is to contribute to the knowledge of weeds in the cultures in this region and their relevance by analyzing their tolerance or resistance to glyphosate. In order to carry out this work, nine soybean farms in the lowlands in the Sierra of Metán were studied during the crop years of 2013-2014, collecting the weeds from fallow to harvest. The species were grouped taking into account their presence or absence during the initial, mid and final phase of the culture. The results showed a richness of 38 species of weeds belonging to 17 botanical families (Poaceae 10, Asteraceae 7, Solanaceae 3, Brassicaceae 2 and the remaining 16 families with only one and two species). During the fallow period, 13 species were identified; they disappeared during the first phases of the culture and can be considered tolerant. The species of the fallow period that persisted at the end of the cycle were 21; these can be considered as glyphosate resistant.