Herbicide Recommendations for Carrots: Preplant Incorporated followed by Postemergence

Pub 75: Guide to Weed Control > Vegetable Crops > Herbicide Recommendations for Carrots: Preplant Incorporated followed by Postemergence

Excerpt from 2008 Chapter 13, Publication 75, Guide to Weed Control, Order this publication

Treflan, Rival or Bonanza followed by Lorox

Trade Name	Treflan PPI	or Rival PPI	or Bonanza PPI	followed by Lorox DF	or followed by Lorox L
Active Ingredient	trifluralin	or trifluralin	or trifluralin	followed by linuron	or followed by linuron
Formulation	480 g/L	500 g/L	400 g/L	50 DF	480 g/L
Rate per hectare (active)	0.6 to 1.1 kg/ha	0.6 to 1.1 kg/ha	0.6 to 1.1 kg/ha	0.55 to 1.625 kg/ha	0.624 to 1.2 kg/ha
Rate per hectare (product)	1.25 to 2.4 L/ha	1.2 to 2.2 L/ha	1.5 to 2.75 L/ha	1.1 to 3.25 kg/ha	1.3 to 2.25 L/ha
Rate per acre (product)	0.5 to 0.96 L/ac	0.48 to 0.94 L/ac	0.6 to 1.1 L/ac	0.44 to 1.3 kg/ac	0.52 to 1.6 L/ac

Precautions

PPI followed by POST.
Use on mineral soils.
Spray linuron when crop has 2 or more fully developed leaves (8-15 cm tall).
Apply POST before annual grasses are 5 cm high & before broadleaf weeds are 15 cm high.
Carrot leaves will become yellow or light green, but they soon recover.
Use nozzle pressure of 175-275 kPa. Do NOT exceed 275 kPa.
Do NOT apply linuron with herbicidal oil.
Do NOT apply linuron during hot, dry weather (>32°C) or when crop is under stress.
Do NOT apply linuron if heavy rains are expected.
Use the lower rates on sandy soils and for smaller weeds.
Do NOT use on coarse-textured soils low in organic matter.

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