Integrated control of herbicide resistant Lolium rigidum in extensive rainfed crops

1. Integrated control of herbicideresistant Loliumrigidumin extensiverainfedcrops Workshop on Weed management in arid and semi-arid climate EuropeanWeedResearchSociety José Mª Montull and Andreu Taberner Universitat de Lleida Dept. de Hortofruticultura, botànica i jardineria OBJECTIVE The main objective 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. MATERIAL & METODS: Untreated winter wheat Untreated spring field pea Untreated spring barley CONCLUSIONS: The effect of sowing in late January has been enough to avoid applying herbicides against L. rigidum in barley crop. In this field, low efficacy has been achieved with ALS and ACCase inhibitors due resistance to these groups of herbicides, including new herbicides still unsold. 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%. 90 plants/m2 of L. rigidum in winter wheat justify its control. 15 plants/m2 of L. rigidum in spring barley not justify its control. 10 plants/m2 of L. rigidum in spring pea justify its control. olium If this field, infested by a L herbicide resistant biotype, the best solution was the crop change. RESULTS: * Still unsold in the spanish market