Aibar Lete, Joaquín

Cirujeda Ranzenberger, Alicia

Marí León, Ana Isabel

Zaragoza Larios, Carlos

citaREA Repositorio Electrónico Agroalimentario

Changes on weed flora from 1976 and thirty years later in Spanish winter cereals  A. Cirujeda1, A. Marí1, J. Aibar2 and C. Zaragoza1 1Unidad de Sanidad Vegetal, CITA, Avda. Montañana 930, 50059 Zaragoza, Spain acirujeda@aragon.es, carza@aragon.es 2 EPS. Universidad de Zaragoza, Ctra. de Cuarte, Km 67, 22071 Huesca, Spain. jaibar@unizar.es  In this work we compare the weed flora recorded in 1976 with that in 2005-07 in winter cereal fields in the province of Zaragoza. In 2005-07 we used a very similar methodology to that used in 1976, based on surveying the fields in a zig-zag by three persons until not founding new species and assessing the abundance of species with a visual scale. It is concluded that grass species have increased, especially Lolium rigidum Gaudin and Avena spp. The average number of species found in each field has decreased from 9.5 ± 2.3 in 1976 to 3.4 ± 2.3 in 2005-07. In 1976, 22 species were found in more than 30% of the fields studied, in 2005-07 only 4 species were counted. Species that have declined more drastically are Daucus carota L., Scandix pecten-veneris L., Veronica agrestis L., Papaver hybridum L., Roemeria hybrida (L.) DC. and Hypecoum procumbens L.. However, we have found 23 species, which were not recorded in 1976, including: Chondrilla juncea L., Phragmites australis (Cav.) Trin., Sorghum halepense (L.) Pers., Xanthium strumarium L., Kochia scoparia (L.) Schrader, Hordeum murinum L.. Some are linked to minimum tillage, others are tolerant to glyphosate pre-sowing treatments (Equisetum arvense L., Malva sylvestris L.) and others may have advanced their emergence due to global warming.  

Changes on weed flora from 1976 and thirty years later in Spanish winter cereals

http://citarea.cita-aragon.es/citarea/bitstream/10532/1704/3/2011_315.pdf

Changes on weed flora from 1976 and thirty years later in Spanish winter cereals

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citaREA Repositorio Electrónico Agroalimentario