Diclofop-methyl resistance in populations of Lolium spp. from central Italy |
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| Authors: | F Bravin G Zanin & C Preston |
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| Institution: | Dipartimento di Agronomia Ambientale e Produzioni Vegetali dell'Universitàdi Padova, Agripolis, 35020 Legnaro (Padova), Italy;CRC for Weed Management Systems and Department of Applied and Molecular Ecology, Waite Campus, University of Adelaide, PMB 1 Glen Osmond SA 5064, Australia |
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| Abstract: | Populations of Lolium spp. collected in central Italy were screened for resistance to acetyl-coenzyme A carboxylase (ACCase)-inhibiting herbicides and compared with known susceptible and resistant Lolium rigidum (Gaud.) populations from Australia. Populations Roma'94 and Tuscania'97 were up to 8- and 7.5-fold more resistant to diclofop-methyl, respectively, than susceptible populations in pot experiments. However, populations Tarquinia'97 and Vetralla'94 were not resistant. Diclofop-methyl resistance levels in the Italian populations were lower than in the Australian populations SLR31 and WLR96 (16.5 and > 64 times more resistant than S respectively). In an agar germination test, Tuscania'97 showed low levels of cross-resistance to fluazifop-p-butyl, whereas no cross-resistance was found in the Roma'94 population. |
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| Keywords: | herbicide resistance diclofop-methyl Lolium spp Italy |
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