Strategies for chemical control of Cyperus esculentus in maize

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18

th

European

Weed

Research

Society

Symposium

17-21 June 2018

Ljubljana, Slovenia

EWRS 2018

www.ewrs2018.org

Book of Abstracts

New approaches for

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Organiser

Kmetijski inštitut Slovenije (KIS) – Agricultural Institute of Slovenia, Hacquetova ulica 17, 1000 Ljubljana, Slovenija

Programme Committee

Dr. Jukka Salonen, Chairman / EWRS Vice-President; Prof. Dr. Hüsrev Mennan, Scientific Secretary; Prof. Dr. Paul Neve, EWRS President

EWRS Scientific Committee

Dr. Theo Verwijst, Department of Crop Production Ecology, Swedish University of Agricultural Sciences, Sweden; Prof. Dr. Garifalia Economou-Antonaka, Faculty of Crop Production Science, Agricultural University of Athens, Greece; Dr. Kirsten Torresen, Norwegian Institute of Bioeconomy Research (NIBIO), Norway; Dr. Roland Beﬀa, Bayer Crop Science AG, Integrated Weed Management & Resistance Biology, Germany; Dr. Ivo O. Brants, Monsanto Europe S.A, Belgium; Jan Petersen, University of Applied Science Bingen, Germany; Christian Bohren, Research Station Agroscope Changins-Wädenswil (ACW), Switzerland; Dr. Per Kudsk, Professor & Head of Section, Dept. of Agroecology, University of Aarhus, Denmark; Maurizio Vurro, Istituto di Scienze delle Produzioni Alimentari – CNR, Italy; Dr. Marleen Riemens, Wageningen University and Research Centre, Netherlands; Prof. Dr. Svend Christensen, University of Copenhagen, Faculty of Life Sciences, Denmark; Dr. Hanan Eizenberg, Newe Ya’ar Research Center, Israel; Dr. Euro Pannacci, Dept. of Agricultural, Food and Environmental Sciences – University of Perugia, Italy; Dr. Paula Westerman, Group Crop Health, Faculty of Agricultural and Environmental Science, University of Rostock, Germany

Local Organising Committee

Assoc. Prof. Dr. Andrej Simončič, President, Agricultural Institute of Slovenia; Dr. Robert Leskovšek, Agricultural Institute of Slovenia; Dr. Gregor Urek, Agricultural Institute of Slovenia; Prof. Dr. Stanislav Trdan, Biotechnical Faculty, University of Ljubljana; Prof. Dr. Mario Lešnik, Faculty of Agriculture and Life Sciences, University of Maribor; Ela Žilič, M. Sc., Agricultural Institute of Slovenia; Marjeta Urbančič Zemljič, M. Sc., Agricultural Institute of Slovenia

Editor

Andrej Simončič

Published by

Kmetijski inštitut Slovenije, 2018

The publication is published e-only – http://www.ewrs.org

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Kataložni zapis o publikaciji (CIP) pripravili v Narodni in univerzitetni knjižnici v Ljubljani COBISS.SI-ID=295336960

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60 17-21 June 2018 — Ljubljana, Slovenia

Strategies for chemical control of Cyperus esculentus in maize

Marco Milan, Silvia Fogliatto, Fernando De Palo, Francesco Vidotto, Aldo Ferrero University of Torino, GRUGLIASCO, Italy

The perennial sedge Cyperus esculentus is rapidly becoming one of the most troublesome weeds across Europe, due to its high adaptive plasticity, the invasive behaviour and the limited availability of eﬀective control methods. The aim of the study was to compare diﬀerent C. esculentus control strategies in maize based on herbicides currently authorized on this crop. The study was conducted in 2016 at Lodi, North-west of Italy on a field of about 1000 m2_{, with 42 plots of 12.5 m}2_each.

Treatments were arranged in completely randomized design with three replications. An untreated area of about 1.5 m2_{was left in each plot. Five weed control strategies were compared:}

pre-emergence (PRE), pre- f.b. early-post-pre-emergence (PRE f.b. E-POST) pre- f.b. late post-pre-emergence (PRE f.b. L-POST), early post-emergence (E-POST), late post-emergence (L-POST). In particular, 2 diﬀerent mixtures of herbicides were applied in PRE, 1 mixture in PRE f.b. E-POST, 4 in PRE f.b. L-POST, 1 in E-POST and 6 in L-POST. The eﬀects on weed infestation were assessed on C. esculentus and on the other weeds by measuring plant density (plants/m2_{), ground coverage (%) and by visually evaluating}

overall eﬃcacy on a percentage base. C. esculentus infestation was quite uniform on the field, with an average density of 41.7 stems/m2_.

C. esculentus was controlled by more than 80% in all PRE and PRE f.b. E-POST strategies, where the active substance S-metolachlor was applied. In general, POST strategies did not control satisfactorily the C. esculentus infestation, with the only exception of the mixture containing the active substance isoxaflutole, tiencarbazone-methyl and halosulfuron-methyl, applied in E-POST (eﬃcacy 92%) and the mixture based on halosulfuron-methyl, applied in L-POST (eﬃcacy 95%).