soybean weed response to herbicides

SOYBEAN WEED RESPONSE TO HERBICIDES
Eric P. Prostko, Extension Agronomist - Weed Science
Pendimax
Squadron
Authority
Metribuzin
PREPLANT INCORPORATED
PERENNIAL WEEDS
ANNUAL GRASSES
BROADLEAF WEEDS
morningglories
Key to response symbols: E=Excellent; G=Good; F=Fair; P=Poor. If no symbol is given, weed response is unknown. SOYBEAN WEED RESPONSE TO HERBICIDES (continued)
Pendimax
Squadron
Metribuzin
PREEMERGENCE
PERENNIAL WEEDS
ANNUAL GRASSES
BROADLEAF WEEDS
morningglories
Key to response symbols: E=Excellent; G=Good; F=Fair; P=Poor. If no symbol is shown, weed response is unknown. 1The generic formulations of metolachlor (Parallel PCS, Stalwart, Me-Too-Lachlor) have not provided the same length of residual control of certain weeds as
similar rates of Dual Magnum formulations in some UGA field trials. SOYBEAN WEED RESPONSE TO HERBICIDES (continued)
Fusilade
Basagran
PREEMERGENCE
POSTEMERGENCE
PERENNIAL WEEDS
ANNUAL GRASSES
BROADLEAF WEEDS
morningglories
Key to response symbols: E=Excellent (>90%); G=Good (80-89%); F=Fair (70-79%); P=Poor (<70%). If no symbol is given, weed response is unknown.
*Assumes 2 applications.
SOYBEAN WEED RESPONSE TO HERBICIDES (continued)
Glyphosate
POSTEMERGENCE
PERENNIAL WEEDS
ANNUAL GRASSES
BROADLEAF WEEDS
morningglories
Key to response symbols: E=Excellent (>90%); G=Good (80-89%); F=Fair (70-79%); P=Poor (<70%). If no symbol is given, weed response is unknown. SOYBEAN WEED RESPONSE TO HERBICIDES (continued)
FirstRate
Front Row
Paraquat
Metribuzin
POSTEMERGENCE
POST-DIRECTED
PERENNIAL WEEDS
ANNUAL GRASSES
BROADLEAF WEEDS
morningglories
Key to response symbols: E=Excellent (>90%); G=Good (80-89%); F=Fair (70-79%); P=Poor (<70%). If no symbol is given, weed response is Weed and Cover Crop Response to Burndown Herbicides Used in Conservation Tillage Soybean Productions Systems in
Georgia.
Glyphosate +
Glyphosate +
Glyphosate +
Glyphosate
Paraquat
Paraquat +
Paraquat +
Glyphosate
metribuzin
+ FirstShot
Soybean plant-back
7-30 days
14-28 days
7-14 days
7-30 days
restriction
1” rainfall or
irrigation
PREPACKAGED TANK-MIXES FOR SOYBEANS
[See manufacturer’s label for specific rates and application uses.] Active Ingredients
Active Ingredients
Product Name
(lbs ai/gal or % ai)
Product Name
(lbs ai/gal or % ai)
sulfentrazone (62.1%) + chloransulam (7.9%) metribuzin (1.25) + S-metolachlor (5.25) chlorimuron (10.7 %) + metribuzin (64.3 %) sulfentrazone (46.9%) + chlorimuron (9.4%) chlorimuron (12.5%) + thifensulfuron (12.5%) chlorimuron (2.85%) + flumioxazin (36.21%) + chlorimuron (9.2%) + flumioxazin (29.2%) + fomesafen (0.95) + S-metolachlor (4.34) glyphosate (2.25) + S-metolachlor (3.0) sulfentrazone (62.1%) + chloransulam (7.9%) pendimethalin (2.25) + imazethapyr (0.17) + imazaquin (0.17) chlorimuron (21.5%) + thifensulfuron (6.9%)
Soybean Pre-Mixtures and Equivalent Rates

Pre-Mixture
Equivalent Rates/A
Suggestions for Horseweed (Marestail) Control in Soybeans

Time of Application
Treatment
Comments
Use at least 15 GPA and flat fan nozzle tips. Apply between 9:00 am and 6:00 pm. Temperatures less than 600F will reduce control. Labeled for 6-12” horseweed plants. Soybeans can be planted in 14 days if 1” of rainfall or irrigation has occurred since application. Roundup PowerMax 5.5SL@ 22-43 oz/A + 2,4-D Soybeans can be planted 30 days after application. Apply to 6” or smaller horseweed plants. Use at least 15 Excellent residual control but no postemergence activity Will not control ALS-resistant populations. Firstrate 84DG @ 0.3 oz/A + NIS @ 0.25% v/v Apply to horseweed plants that are 6” tall or less. Can also be tank-mixed with glyphosate in RR soybeans. Will not control ALS-resistant populations.

Source: http://gasoybeans.uga.edu/documents/Prostko_SoybeanWeedResponsetoHerbicides.pdf