Susceptibility of the species Conyza canadensis (L.) Cronquist and Conyza bonariensis (L.) Cronquist to glyphosate

• Published in: Acta Herbologica (Serbia) Vol. 17; no. 2
• Main Authors: Pavlovic, D., Institut za zastitu bilja i zivotnu sredinu, Beograd (Serbia), Vrbnicanin, S., Poljoprivredni fakultet, Beograd - Zemun (Serbia), Reinhardt, C., University of Pretoria (South Africa). Faculty of Natural and Agric Sciences, Department of Plant Protection and Soil Sciences, Fischer, A., University of California, Davis (USA). Department of Plant Sciences
• Format: Journal Article
• Language: Serbian
• Published: 2008
• Subjects: CONYZA; EXPERIMENTACION EN CONTENEDOR; EXPERIMENTATION EN POT; FEUILLE; GLIFOSATO; GLYPHOSATE; HOJAS; http://www.fao.org/aos/agrovoc#c_24849; http://www.fao.org/aos/agrovoc#c_25427; http://www.fao.org/aos/agrovoc#c_26452; http://www.fao.org/aos/agrovoc#c_32520; http://www.fao.org/aos/agrovoc#c_4243; LEAVES; PESTICIDE RESISTANCE; POT EXPERIMENTATION; RESISTANCE AUX PESTICIDES; RESISTENCIA A LOS PLAGUICIDAS
• ISSN: 0354-4311

Changes in leaf anatomy were examined in suspectedly resistant populations of Conyza canadensis and Conyza bonariensis after application of 2, 4 and 8 L/ha of the product Touch down (500 g a.i. glyphosate/L). Samples for the analysis (LM, TEM) were collected 3, 7 and 24 h after herbicide application. Changes in chlorophyll and shikimic acid contents were also examined in the population tested. Changes in the anatomy of leaves were not detected in the investigated populations 3 and 7 h after herbicide application. However, 24 h after application of different herbicide rates, differences were observed in leaf anatomy. Injuries were detected in Conyza bonariensis population after application of 2 L/ha, and in Conyza canadensis population after treatment with the highest glyphosate rate (8 L/ha). Changes were detected on cell walls, chloroplast lamellae and chloroplasts themselves. Based on chlorophyll and shikimic acid contents, significant statistical differences were detected between the treated and control plants.