Agronomy for Sustainable Development (2011) 31, 483-490

Joel Torra, Aritz Royo Esnal and Jordi Recasens Guinjuan (2011)
Management of herbicide-resistant Papaver rhoeas in dry land cereal fields
Agronomy for Sustainable Development 31 (3), 483-490
Abstract: Papaver rhoeas is the most common dicotyledonous weed in winter cereals in southern Europe. It is an increasing problem due to the appearance of herbicide resistant biotypes to synthetic auxines and/or to sulfonylureas. The development of management strategies that combine both cultural and chemical tactics is required. We evaluated the combination of different strategies for the management of a herbicide resistant P. rhoeas population to 2,4-D with high infestation levels during four consecutive seasons, from 2002-2003 to 2005-1006, in a rain-fed winter cereal field in North-Eastern Spain. The experiment included the traditional wheat monocrop and five management systems with different combinations of chemical and physical fallows, delayed seeding with barley, chemical and mechanical control, chisel cultivation and mouldboard ploughing. Weed densities along the season and yield at harvest were measured for each treatment. Our results show that in all systems reductions from 90% to 100% of the weed densities were reached. No yield penalties were detected for the non-chemical systems with harrowing along seasons. Moreover, the last 2005/06 season yields, of 2,183-2,356 kg/ha, were higher than the system with traditional wheat monocrop (1,820 kg/ha). The system with delayed seeding every two seasons had the highest yield, of 4,093 kg/ha, the second season, and no differences with other management systems monitored were found other seasons. Delayed seeding and the different fallows studied showed their effectiveness in reducing weed densities, but always combined with other control methods like chemical control or cultivation. This study shows that effective control of herbicide resistant P. rhoeas can be achieved with adequate management programmes that combine two or more different strategies, with less dependence on herbicides. These findings define cultural management strategies to reduce herbicide resistant P. rhoeas infestations and to contribute to integrated weed management strategies combining these with other tools.
(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): Joel Torra

Research topic(s) for pests/diseases/weeds:
pesticide resistance of pest
environment - cropping system/rotation

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Papaver rhoeas (weed)	Wheat (Triticum)	Spain (continental)