Tolerance of eucalypt (Eucalyptus spp.) seedlings to imazapyr in nutritive solution

Planta Daninha

C.m.m. Silva²  L.r. Ferreira¹  F.a. Ferreira¹  G.v. Miranda¹ 

[1] ,Universidade Estadual do Norte Fluminense Darcy Ribeiro Centro de Ciências e Tecnologias Agropecuárias Laboratório de FitotecniaCampos dos Goytacazes RJ

关键词: Chopper NA;    Eucalyptus grandis;    E. urophylla;    herbicide;    dose-response;    Chopper NA;    Eucalyptus grandis;    E. urophylla;    herbicida;    dose-resposta;   

DOI  :  10.1590/S0100-83582004000400015

来源: SciELO

【 摘 要 】

Imazapyr has presented excellent results in controlling coppices in stand reforms of eucalypt forests, despite differences in the efficacy levels. To find out whether these different responses are caused by the genetic variability of the cultivated materials, two experiments were carried out under greenhouse conditions with different imazapyr doses in a hydroponic system in plastic vases containing 2,500 mL solution. The clones IEF-1 (Eucalyptus grandis x Eucalyptus sp. hybrid), GE 463 (E. urophylla x E. grandis), and MN 445 (E. grandis x Eucalyptus sp. hybrid) were used in the first assay, and IEF-1, IEF2 (E. grandis x E. urophylla) x Eucalyptus sp. hybrid) and the clones 129 and 7182 (E. grandis x Eucalyptus sp. hybrids) in the second assay. Thirty days after transplanting the seedlings to a nutritive solution, imazapyr was applied to the solution at doses of 0.00, 0.05, 0.10, 0.20, 0.40, 0.80, 1.60 and 3.20 muL L-1. Clone GE 463 proved to be more tolerant to imazapyr than clones IEF-1 and MN 445 in the first assay; however, in the second, clone 7182 was the most tolerant. Thus, doses should also be differentiated when controlling coppices, according to the cultivated clone.

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