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Planta Daninha

Print version ISSN 0100-8358

Planta daninha vol.10 no.1-2 Viçosa  1992

http://dx.doi.org/10.1590/S0100-83581992000100006 

Efeitos do herbicida lactofen sobre três cultivares de soja I. Alterações morfológicas externas e internas de folhas

 

 

C.F. Damião FilhoI; G.M. CorsoII; E V.M. De M. AndradeIII

IProfessor Assistente-Doutor da FCAV-UNESP, campus de Jaboticabal. 14870-000 Jaboticabal,SP
IIProfessora Assistente-Doutora do IB-UNESP, campus de Rio Claro. 13506-900 Rio Claro, SP
IIIProfessora Assistente-Doutora da FCAV-UNESP, campus de Jaboticabal. 14870-000 Jaboticabal,SP

 

 


RESUMO

O lactofen, herbicida do grupo dos difenil éteres, é indicado para uso na cultura da soja, em pós-emergência, devido sua eficácia no controle de plantas daninhas latifoliadas. No presente trabalho, conduzido em casa-de-vegetação, foram utilizadas as cultivares de soja Foscarin-31, IAC-8 e IAC-9, tratadas com lactofen nas doses 0,018 e 0,36 kg de lactofen i.a./ha, aplicadas quando as plantas apresentavam a Segunda folha composta totalmente expandida. Aos quatro e doze dias após as aplicações, foram analisadas e descritos os sinais macroscópicos e microscópicos de intoxicação nos folíolos das folhas. Os resultados indicaram que o lactofen ocasionou expressivas alterações morfológicas externas e internas das folhas, nos locais onde foi depositado, e que a dose maior acentua os efeitos do produto sobre as plantas, sendo que as cultivares de soja apresentaram diferentes graus de sensibilidade ao produto.

Palavras-chave: lactofen, doses, soja, alterações morfológicas e histológicas.


SUMMARY

Lactofen, a diphenil ether herbicide, is indicated for use in soybean crop, at post-emmergence, due to its efficacy on broad-leaf weed control. In the present assay, under greenhouse conditions, soybean cultivars as Foscarin-31, IAC-8 and IAC 9 were used. The herbicide was applyed at the 2nd whole expanded composed leaf stage at 0, 0.18 and 0,36 kg of lactofen a.i./ha. At four and twelve days after applications, external and internal morphological aspects on the attainned leaves were evaluate. Results showed that the lactofen generally raised injurious effects in the loci where it was deposited. Sensitivity of the three tested soybean cultivars to the herbicide was different.

Key-words: lactofen, rates, soybean, morphological and histological alterations.


 

 

Texto completo disponível apenas em PDF.

Full text available only in PDF format.

 

 

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