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Conclusion of the control experiment: 
-Spraying with Combo is the most efficient, low cost- and least manpower-requiring treatment. 
-On the other hand, the commonly used concentrations of this herbicide resulted in high mortality rates of all other components of the vegetation.
-Half of the application rate of Combo in combination with cutting reduces the impact on other vegetation dramatically, but is still highly efficient with respect to bracken.
-Black-foil & cutting, or cutting alone proved as the best method for bracken control if herbicides are not allowed and other vegetation should be preserved.

Treatments:
Asulam	with 400g/l active agent: 6l/ha
Glyphosat with 480g/l active agent: 4l/ha
Wilt Pruf with 25% active agent in solution: 6l/ha
Combo (PM) with 240g/l Picloram and Metsulfuron Methyl (60% p/p): 4l/ha
black foil:	6x6m/Plot
transparent foil:	6x6m/Plot
Cutting: only bracken leaves were cut, other vegetation remained in the plots
treatment combinations:
all treatments mentioned above were used in combination with cutting in alternating application

Further information in 
Roos K, Rödel HG & Beck E 2011: Short- and long-term effects of weed control on pastures infested with Pteridium arachnoideum and an attempt to regenerate abandoned pastures in South Ecuador. Weed Research 51: 165-176. doi: 10.1111/j.1365-3180.2010.00833.x; 1365-3180