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VCRB :: Contents of Volume 56/2002 :: Detailed information


DYNAMICS OF CONTROL AND REGROWING OF COUCHGRASS (AGROPYRON REPENS) AS AN EFFECT OF GRASS HERBICIDES AND OIL ADJUVANT APPLICATION 


Zbigniew ANYSZKA, Adam DOBRZAŃSKI
Research Institute of Vegetable Crops,Konstytucji 3 Maja 1/3, 96-100 Skierniewice, Poland


Summary

The studies were undertaken to determine the dynamics of control and regrowing 
of Agropyron repens after grass herbicides application. The experiments were carried
out during the years 1997-2000 on cultivated field, without crops, strongly infested
by Agropyron repens. Herbicides were used during intensive growth of this species,
when plants were 10-40 cm height (most at 3-6 leaves stage). In the field experiments
grass herbicides such as: cycloxydim, fluazifop-P, sethoxydim,  haloxyfop-R, quizalofop,
propaquizafop, quizalofop-P-tefuryl and tepraloxydim were tested. All compounds were
applied at their highest label rates, recommended for Agropyron repens control in Poland.
Each herbicide was used without or with post-refined free fatty acids from rape seed oil.
The dynamics of Agropyron repens control was evaluated 4 times a year and ground
coverage twice a year. At the end of growing season the biomass of Agropyron repens
shoots and rhizomes were assessed. In the greenhouse test, regrowing of rhizomes
in the spring, after storage, was determined. The results of experiments indicate
a different reaction of Agropyron repens to grass herbicides. Regrowing process
of Agropyron repens treated with herbicides began in the year of application and
started at different time. The addition of adjuvant to the spraying solution, slightly
improved efficacy of most grass herbicides. The number and biomass of Agropyron
repens
shoots, regrown from the rhizomes after storage period, decreased after
fluazifop-P and sethoxydim application in tank mixtures with adjuvant, in comparison
to the use of herbicides alone.


keywords:couchgrass, grass herbicide, adjuvant

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