Hairy fleabane (Conyza bonarienis) response to saflufenacil in association with different formulations of glyphosate subjected to simulated rainfall
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Kuupäev
2020
Kättesaadav alates
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Abstrakt
Saflufenacil has been used to control glyphosate resistant weeds, including hairy
fleabane. There are several glyphosate formulations, which are related to different salts and
adjuvants. Differences between these formulations may result in variations in efficacy, especially
in the face of unfavorable environmental conditions, such as the occurrence of unexpected rainfall
after application. The objective of this study was to evaluate the control of hairy fleabane with
saflufenacil in tank mix with different formulations of glyphosate subjected to simulated rainfall
after application. The treatments evaluated were salts of glyphosate (isopropylamine, potassium
and ammonium salt), different periods of simulated rainfall after herbicide application (30, 120
and 240 min, and no rainfall), and the presence or absence of saflufenacil and a non-ionic
adjuvant. Absorption of saflufenacil by hairy fleabane is rapid, since simulated rainfall after 30
min after application did not result in loss of efficiency when the herbicide is applied with
adjuvant. The association of isopropylamine and ammonium salts of glyphosate with saflufenacil
increases the control of hairy fleabane and prevents the occurrence of regrowth when rainfall
occurs at 30 min after the application. The occurrence of simulated rainfall after 240 min reduces
the glyphosate efficiency by 30%, 15% and 60% for the isopropylamine, potassium and
ammonium salt formulations, respectively. The addition of adjuvant improves the efficiency of
glyphosate salt of potassium by 40%. The response of the mixture of glyphosate and saflufenacil
is variable, mainly in situations of rainfall after application.
Kirjeldus
Märksõnad
EPSPS, herbicide absorption, PPO, tank mix, weed resistance, articles