Improved 2002 Guide to Weed Control

New to the Guide to Weed Control for this year is four tables identifying herbicides in corn and soybeans that can be tank mixed. Under the corn section, table 13 - Corn Soil Applied Herbicide Tank-Mixes and table 14 - Corn Postemergence Herbicide Tank-Mixes list the registered herbicide tank mixes which can be applied to the corn crop. In the soybean section, table 18 - Soybean Soil Applied Herbicide Tank Mixes and table 19 - Soybean Postemergence Herbicide Tank-Mixes list the registered herbicide tank mixes which can be applied to the soybean crop.

Table 16, Soybean Postemergence Herbicide Leaf Stages Is a new table that provides a handy reference guide of soybean and weed growth stages for the various postemergence herbicide applications. Table 16 also lists herbicide rate ranges where applicable.

Other new field crop herbicides and label changes for the 2002 season include:

FIRSTRATE (cloransulan-methyl - group 2) is a soybean broadleaf weed herbicide that can be applied preemergence or postemergence, prior to the flowering stage of soybeans. FIRSTRATE is particularly effective against ragweed and velvetleaf, but weak on lamb's-quarters, annual nightshade and pigweed. The rotation interval with canola is 26 months.

BOUNDARY is a co-pack of DUAL MAGNUM AND SENCOR 500F (s-metolachlor - group 15 and metribuzin - group 5). It can be applied preplant, preplant incorporated or preemergence in soybeans to control annual grasses and broadleaf weeds. The preplant incorporated application provides yellow nutsedge control. Do not apply to coarse textured soils with less than 2% organic matter or to metribuzin sensitive soybean varieties.

BROADSTRIKE DUAL MAGNUM is a premix of flumetsulam (group 2) and s-metolachlor (group 15) applied preplant, preplant incorporated or preemergence in soybeans to control annual grasses (weak on proso millet), and broadleaf weeds. Preplant applications provide up to 80% control of horsetail. The preplant incorporated application provides yellow nutsedge control. Do not apply to areas where the soil pH is greater than 7.8 or where the organic matter levels are less than 2% or greater than 5%. The rotation interval with canola is 26 months.

SUMMIT is a premix of primisulfuron-methyl - group 2 and dicamba - group 4 applied postemergence in field corn (2 to 7 leaf stages of corn) to control broadleaf weeds and quackgrass. Do not apply to corn treated with an organophosphate insecticide. The rotation interval with canola is 22 months.

ACCENT 1-PASS, is a new co-pack of ACCENT (nicosulfuron - group 2) and PEAKPLUS (prosulfuron - group 2 + dicamba group 4) for postemergence application in field corn. ACCENT 1-PASS can be applied from the 1^st to the 8^th leaf stage of corn to controls annual grasses (weak on yellow foxtail and crabgrass), quackgrass and broadleaf weeds. The rotation interval with alfalfa is 22 months.

LIBERTYPRIME is a co-pack of PRIMEXTRA II MAGNUM (s-metolachlor, and atraxine - groups 15, 5) and LIBERTY 200 SN (glufosinate ammonium - group 10) that is applied postemergence on field corn developed to be tolerant to LIBERTY 200 SN. LIBERTYPRIME can be applied from the 2^nd to the 6^th leaf stage of corn to control annual grasses, broadleaf weeds and provide suppression of some perennial weeds.

KORIL is a new formulation (235 g/l active) of bromoxynil - group 6, containing the same active ingredient as PARDNER, which is 280 g/l active.

MEXTROL is a new formulation (400 g/l active) of bromoxynil + MCPA - groups 6, 4, containing the same active ingredient as BUCTRIL M, which is 560 g/l active.

EVICT SOLUPAK is a 75 DF (dry flowable) formulation of metribuzin - group 5.

VENTURE L is an emulsifiable concentrate (125 g/l active) formulation of fluazifop-p-butyl - group, which repalces VENTURE 25G AND FUSILADE ll.

TOUCHDOWN 600 is a solution of glyphosate TMS - group 9, which contains 413 g/l active. This formulation is mainly for the bulk market. TOUCHDOWN 480, which contains 330 g/l active of glyphosate TMS is also available.

REGLONE DESSICANT is a liquid formulation (240 g/l active) of diquat - group 22. This is a name change from Reglone 240.

VANQUISH is a 480 g/l active formulation of dicamba previously sold as DYCLEER.

Related Links

• Guide to Weed Control, OMAFRA Publication 75

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