| dc.description.abstract | This study aimed to evaluate the dose response of goosegrass (Eleusine indica)
populations suspected of having developed resistance to the herbicides glyphosate
and glufosinate. The resistant population (EKM) was collected from PTPN II
Kwala Madu Plantation, while the susceptible population (EPB) was obtained
from Padang Bulan Ward, an area with no history of herbicide exposure. The
experiment was arranged in a Randomized Block Design (RBD) with four
replications. The number of herbicide dose levels varied by treatment: six doses
for glyphosate (tested on both EKM and EPB) and for glufosinate (on EPB), five
doses for glufosinate (on EKM), and eight doses for paraquat (on both
populations). Observed parameters included mortality, dry weight, and visual
symptoms of injury. The results showed that the EKM population exhibited high
Resistance Index (RI) values based on LD₅₀: glyphosate (>34,560 g a.i./ha),
glufosinate (12.72), and paraquat (8.70). Based on GR₅₀, EKM also demonstrated
significant resistance: glyphosate (4.80), glufosinate (6.79), and paraquat (5.20).
Compared to EPB, EKM showed lower mortality, higher dry weight, and milder
injury symptoms across all tested doses. These findings confirm that the EKM
population has developed multiple resistance to glyphosate and glufosinate, as
well as moderate tolerance to paraquat. The results highlight the urgent need to
implement integrated weed management strategies, including herbicide mode-of-
action rotation, to prevent further spread of herbicide resistance. | en_US |
