Impact: topramezone

Trade Names	Impact
Formulation	SC
Guaranteed active concentration	336 g/L
Groups	27
Ontario Schedule	2
Winter Storage	A
Chemical Family	Pyrazolone
Crop and/or Non-Crop Registrations	Field corn
Sensitive Weeds	Annual broadleaf and grassy weeds, including triazine and group 2 resistant biotypes.
Uptake and Translocation	Following foliar application, is rapidly absorbed and translocated in both xylem and phloem.
Basis of Selectivity	Inhibits the HPPD enzyme found in photosynthetic cells of susceptible species. Symptoms on susceptible plants are bleaching followed by necrosis. Tolerant species rapidly metabolize topramezone.
Application Methods	Postemergence in field corn between the 1 to 8 leaf stage for broadleaf weeds and 1 to 4 leaf stage of grassy weeds.
Residual Activity	Degradation primarily by soil microbial action. Topramezone provides soil residual activity against broadleaf weeds.
Unique Characteristics	The activity of topramezone is significantly enhanced by atrazine. A tank mix of Topramezone with atrazine and dimethenamid provides a one-pass, postemergence weed control program with residual activity against grass and broadleaf weeds.
Manufacturer / Registrant	BASF Canada Inc.