DETERMINACIÓN DE DOSIS DE GLIFOSATO PARA EL CONTROL DE CYNARA CARDUNCULUS L. EN DIFERENTES ESTADOS VEGETATIVOS

MOYANO G.; TUCAT G.; DADDARIO J.F.F.; BENTIVEGNA D. J.

Buenos Aires

Congreso; XXII Congreso Latinoamericano de Malezas (ALAM); 2015

Asacim y Alam

Cynara cardunculus (Artichoke thistle) is a non-native weed that has invasive behavior in Argentina. This study determined the proper rates to control it using the herbicide glyphosate. Three vegetative stages plants were grown in pots: early, intermediate and advanced. The applications of glyphosate (Roundup Full II LS a.i.: 66.2%, ae: 54%) were performed under controlled laboratory conditions with a machine developed for this purpose. Plants were characterized in height, dry weight, leaf area and perimeter and number of leaves. Glyphosate treatments consisted of 0.125; 0.25; 0.5; 1; 2; 4 l ha-1. The machine sprayed a flow of 100 l ha-1 using a nozzle of 11002. While the leaf area was registered with the Image J software, the number and size of the impact was measured with DepositScan. At 30 days after application the plants were harvested and the height and dry weight were measured. A dose/response curve was drawn with the tested rates. The dose of glyphosate needed to reduce 100% C. cardunculus in all phenological stages is 0.5 l ha-1 (0.331 g a.i. ha-1); however, efficient control on early and middle vegetative stage can be achieved with half of the cited dose. Adjusting a dose/response curve was determined that 0.275 g pa ha-1 are required for 90% control of advanced vegetative stage plants. C. cardunculus is controlled with a reduced dose of glyphosate in the early and middle vegetative stages.