Pest Management Science (2016) 72, 1031-1039

Thai Hoan Nguyen, Jenna M. Malone, Peter Boutsalis, Neil Shirley and Christopher Preston (2016)
Temperature influences the level of glyphosate resistance in barnyardgrass (Echinochloa colona)
Pest Management Science 72 (5), 1031-1039
Abstract:
BACKGROUND
Echinochloa colona is an important summer-growing weed species in cropping regions of northern Australia that has evolved resistance to glyphosate owing to intensive use of this herbicide in summer fallow.
RESULTS
Pot trials conducted at 20 and 30 °C on six E. colona populations showed a significant increase in the level of glyphosate resistance in resistant populations at 30 °C compared with 20 °C. However, there was no influence of growth temperature on glyphosate susceptibility of the sensitive population. Sequencing of the target-site gene (EPSPS) of the six populations identified a mutation at position 106 leading to a change from proline to serine in the most resistant population A533.1 only. EPSPS gene amplification was not detected in any of the resistant populations examined. Examining ¹⁴C-glyphosate uptake on two resistant and one susceptible population showed a twofold increase at 20 °C; however, few differences in glyphosate translocation occurred from the treated leaf to other plant parts between populations or temperatures.
CONCLUSION
There is reduced efficacy of glyphosate at high temperatures on resistant E. colona populations, making these populations harder to control in summer.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Christopher Preston, Jenna M. Malone, Peter Boutsalis

Research topic(s) for pests/diseases/weeds:
pesticide resistance of pest

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Echinochloa colona (weed)