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Integrated control of herbicide resistant Lolium rigidum in extensive rainfed crops

Integrated control of herbicide resistant Lolium rigidum in extensive rainfed crops. José Mª Montull, Andreu Taberner. Rainfed crops in Spain take around 9700000ha Yields fluctuate between 1-5 tm/ha of barley

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Integrated control of herbicide resistant Lolium rigidum in extensive rainfed crops

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  1. Integrated control of herbicideresistantLoliumrigidumin extensiverainfedcrops José Mª Montull, Andreu Taberner

  2. Rainfed crops in Spain take around 9700000ha • Yields fluctuate between 1-5 tm/ha of barley • There are few available crops for rotation & farmers unknown the return on alternative crops Introduction

  3. In the short term, monocropping seems to have more return • In the long term, rotations can have the same or more return: • Increase of yields • Decreases pests • Decresase the cost on plant protection • Directive 2009/128/EC establishes the requirement of IPM Introduction

  4. There are two groups of alternative crops: • Oilseed crops • Pulse crops • Broadleaf crops can facilitate grass weeds managing: • Late crop sowing • Use herbicides with different modes of action • Use of “strong” ACCase inhibitors for control NTSR IntroductionAlternative crops

  5. The main objective of this paper is to study different alternatives for herbicide-resistant L. Rigidum control in rainfed cereal cropping systems, integrating three different crops in rotation different herbicides approved for each crop. IntroductionObjective

  6. Fieldlocated in Calaf (Lleida) (NE Spain) • 480mm averageannualrainfall • Clay-loamsoil • Difficultyto control Loliumrigidumwithherbicides • Threecrops: Winter wheat, springbarley & springfield pea • 5 herbicides per crop & untreated Material & methods

  7. Material & methods

  8. Aplicationduewithan experimental sprayerpressurisedwithnitrogen • Boom with 4 Hardi ISO LD-110-02 nozzles • 330l/ha of waterdelivery Material & methods

  9. Results & discussionLoliumdensity at harvest in untreatedplots

  10. Results & discussion

  11. Results & discussionLoliumDensity at harvest

  12. Results & discussion

  13. Conclusions The effect of sowing in late January have been enough to avoid applying herbicides against L. rigidum in barley crop In this test, low efficacy has been achieved with ALS and ACCase inhibitors due resistance to these groups of herbicides Auros and Kerb efficacy was conditioned by the drought at winter in the application time Only Mutual and Auros in spring pea, have been achieved efficaccy up to 90%

  14. 90 plants/m2 of L. rigidum in winter wheat justify a treatment for control it • 15 plants/m2 of L. rigidum in spring barley not justify a herbicide treatment • 10 plants/m2 of L. rigidum in spring pea justify a treatment for controlling it • If this field, infested by a Lolium herbicide resistant biotype, it was not economically justified a treatment with an herbicide which the weed has developed resistance. In this case, the best solution has been the crop change. Conclusions

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