TY - JOUR N2 - Plant responses to glyphosate applied at different doses were examined for one glyphosate resistant (R) and one glyphosate susceptible (S) population of Conyza albida and C. bonarienis. Growth rates and development stages of five R C. albida and three R C. bonarienis populations were also compared with those of their respective S counterparts to investigate the possible impact of the glyphosate resistance trait on their fitness. The GR50 values for C. albida R (3.94−5.22 kg a.i. · ha−1) and S (0.24−0.31 kg a.i. · ha−1) populations were higher than those of C. bonariensis R (0.60−1.51 kg a.i. · ha−1) and S (0.10−0.13 kg a.i. · ha−1). The growth rate (slope b) of one R C. albida population was lower than the respective S and other R populations, while growth rates of most R and S C. bonariensis populations were similar. Some R populations showed inconsistent differences in some development stages when compared to those of the S ones, which cannot be attributed to the glyphosate resistance trait. L1 - http://journals.pan.pl/Content/109974/PDF/Mylonas.pdf L2 - http://journals.pan.pl/Content/109974 PY - 2019 IS - No 1 EP - 40 DO - 10.24425/jppr.2019.126044 KW - Conyza resistance KW - development stage KW - fitness cost KW - glyphosate KW - growth rate A1 - Mylonas, Philippos N. A1 - Giannopolitis, Costas N. A1 - Efthimiadis, Panagiotis G. A1 - Menexes, Georgios C. A1 - Eleftherohorinos, Ilias G. PB - Committee of Plant Protection PAS PB - Institute of Plant Protection – National Research Institute VL - vol. 59 DA - 2019.04.04 T1 - Dose-response and growth rate variation among glyphosate resistant and susceptible Conyza albida and Conyza bonariensis populations SP - 32 UR - http://journals.pan.pl/dlibra/publication/edition/109974 T2 - Journal of Plant Protection Research ER -