Management of herbicide resistant corn poppy (Papaver rhoeas) under different tillage systems does not change the frequency of resistant plants
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Date
2018-07-05
Authors
Torra Farré, Joel
Royo-Esnal, Aritz
Rey Caballero, Jordi
Recasens i Guinjuan, Jordi
Salas, Marisa
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Corn poppy (Papaver rhoeas L.) is the most widespread broadleaf weed species infesting winter cereals in Europe. Biotypes that are resistant to both 2,4-D and tribenuron-methyl, an acetolactate synthase (ALS)-inhibitor, have evolved in recent decades, thus narrowing the options for effective chemical control. Though the effectiveness of several integrated weed management (IWM) strategies have been confirmed, none of such strategies has been tested to manage multiple herbicide-resistant P. rhoeas under no-till planting. With the expansion of no-till systems, it is important to prove the effectiveness of such strategies. In this study, a field experiment over three consecutive seasons was conducted to evaluate and compare the effects of different weed management strategies, both under direct drilling (i.e. no-till) and intensive tillage, on a multiple herbicide-resistant P. rhoeas population. Moreover, evaluations were carried out as to whether the proportions of ALS-inhibitor resistant individuals were affected by the tillage systems for each IWM strategy at the end of the three-year period. The IWM strategies tested in this research included crop rotation, delayed sowing and different herbicide programs such as PRE plus POST or POST. All IWM strategies greatly reduced the initial density of P. rhoeas each season (≥ 95%), both under direct drilling and intensive tillage. After three years, the IWM strategies were very effective in both tillage systems, though the effects were stronger under direct drilling (~95%) compared to intensive tillage (~86%). At the end, the proportion of ALS-inhibitor resistant plants was not different between the IWM strategies in both tillage systems (94% on average). Therefore, crop rotation (with sunflower (Helianthus annuus L.)), delayed sowing, or a variation in the herbicide application timing are effective under direct drilling to manage herbicide-resistant P. rhoeas. Adoption of IWM strategies is necessary in order to mitigate the evolution of resistance in both conventional and no-till systems
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Weed Science, 2018, vol. 66, núm. 6, p. 764-772