Table 1: Percent survival of parent Palmer amaranth biotypes (GR and GS) and F1 families (R × S and S × R) after treatment with glyphosate*.

BiotypeHerbicide rate (g/ha)

GR Parent44a32a
GS Parent10b3c
F1 R × S86a81a22b10b
F1 S × R83a68a22b4b

* Abbreviations used: GR: glyphosate-resistant; GS: glyphosate-susceptible; R × S and S × R: reciprocal crosses where, the first alphabet denotes female parent. Means within a glyphosate rate followed by the same letter are not significantly different according to Fisher’s Protected LSD test at 𝑃 0 . 0 5 .