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Planta Daninha

Print version ISSN 0100-8358On-line version ISSN 1806-9681

Abstract

MARTINS, D.; CARBONARI, C.A.; TERRA, M.A.  and  MARCHI, S.R.. The effect of adjuvants on glyphosate absorption and translocation in water hyacinth (Eichhornia crassipes). Planta daninha [online]. 2009, vol.27, n.1, pp.155-163. ISSN 0100-8358.  http://dx.doi.org/10.1590/S0100-83582009000100020.

This study was carried out to evaluate the effects of adjuvants on glyphosate absorption and translocation in Eichhornia crassipes. The treatments were arranged in a 5 x 8 factorial scheme, being five with glyphosate (with no adjuvant and with the adjuvants Aterbane at 0.5 and 0.25% v/v and Silwet L 77 at 0.1 and 0.05% v/v ) applied on a single leaf of each plant at 8 intervals to wash or cut the leaves (2, 4, 6, 8, 12, 24, and 48 hours, plus a continuous interval without washing or cutting). Visual control evaluations were carried out at 7, 14, 21, and 28 days after treatment application. The absorption of 0.5% Aterbane and 0.1% Silwet promoted a higher control after shorter periods without leaf washing (2 and 4 hours).However, by the end of the study, all the adjuvants showed an excellent control after the period of 6 hours, as well as glyphosate without adjuvant. For the translocation study, no leaf cutting after six hours promoted an excellent control, regardless of the adjuvant tested. For the 2 and 4 hour periods, an unsatisfactory control was observed, regardless of the adjuvant tested, showing that leaf cutting during periods below 6 hours after application is not sufficient for an efficient translocation and to guarantee control of the aquatic plants.

Keywords : aquatic weeds; weeds; application technology.

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