Revista Brasileira De Herbicidas 2002; 3(1): 57-62
Imazethapyr selectivity for three common bean genotypes
DOI: 10.7824/rbh.v3i1.373
With the purpose of evaluating the selectivity of the imazethapyr herbicide at different dosages to common bean genotypes, an experiment was conducted in greenhouse at the Department of Agriculture of the Universidade Federal de Lavras, from April, 20 to August 4, 2001. The experimental design was a completely randomized with four replications in a 3×4 factorial arrangement, i.e., three common bean genotypes (Pérola, CII-I02 and Ouro Negro) and four dosages of the imazethapyr herbicide (O, 50, 100 and 150 g/ha). The phytotoxicity, plant height and dry weight of the aerial parts, pod number per plant, seed number per pod and one hundred seed weight were evaluated. The bean genotypes showed differential behavior to herbicide dosages. Pérola and Ouro Negro cultivars showed the highest tolerancy to imazethapyr and the CIl-l 02 lineage, on the other hand, showed high sensibility to the herbicide. Nevertheless, the herbicide did not interfere with the plant height ofthe genotype, but the phytotoxicity symptoms and yield losses showed linear increase with increasing dosages of imazethapyr. At 21 days afie r the herbicide application, ali the visible symptoms on bean plants were reverted. The lineage ClI-102 grain yield decreased 37% with the increasing dosages ofthe herbicide.
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