Abstract
Investigations were made in Martonvásár on the herbicide tolerance of 22 inbred maize lines and 3 parental single crosses when treated with one herbicide applied after sowing, prior to emergence, and with seven applied post-emergence in the 6-8-leaf stage. Visible damage was scored 14 days after the treatment.An analysis of the phytotoxic effects led to the conclusion that a single dose of the tested herbicides did not cause any damage to the genotypes investigated, with the exception of one inbred line, which was extremely sensitive to herbicides of the sulphonyl carbamide type and moderately sensitive to both rates of dicamba. In many cases, a double dose of the herbicides caused mild or moderate symptoms on the maize lines.
Highlights
A quarter of the arable land in Hungary is occupied by maize
Investigations were made in 2002 on the tolerance of 22 inbred maize lines and 3 parental single crosses grown on chernozem soil with forest residues (Calciustoll) in Martonvásár to one herbicide applied pre-emergence and 7 applied postemergence
Only mezotrion is authorised for use in maize seed production
Summary
A quarter of the arable land in Hungary is occupied by maize. The climate and soil conditions make the country ideally suitable for field seed production. The inbred lines used for the production of hybrid maize seed respond more sensitively to external environmental effects than the hybrids produced by crossing them. This greater sensitivity is manifested both in their habits and in their response to various stress factors. Inbred lines can only compete successfully for light, water, nutrients and carbon dioxide if they are adequately protected against their chief rivals, weeds. In order to keep the weed cover below the danger threshold, all possible means must be employed, including crop rotation, the use of a cultivator between the rows, and the application of herbicide. The use of chemicals is an important component of integrated weed management. The ever widening choice of herbicides and maize hybrids necessitates regular herbicide tolerance tests on maize hybrids and their parental lines
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