Cooperative
Extension
Service


University of Illinois
at
Urbana-Champaign


No. 14/June 25, 1998

Final Set of Multi-State Herbicide-Efficacy Tables

This is the final set of multi-state herbicide-efficacy tables, as compiled by Marshal McGlamery. Earlier issues of this Bulletin contained similar tables for corn grass (April 24), corn broadleaf (May 1), and soybean grass (June 19) herbicides.

Key for Tables 1 to 14

Control rating scales used vary by state.

1-9 scales: State explanation or interpretation
IL 9 = excellent (90-100%); 8 = good (80-89%); 7 = fair (70-79%); 6 = poor (60-69%); 5 or less = unsatisfactory
IN 9 = good; 8 = fair-good; 7 = fair; 6 = poor-fair; 5 or less = poor; 0 = no control; - = insufficient information
KY 8-9 = good; 6-7 = fair; 5 or less = poor; - = insufficient information
OH 9 = 90-100%; 8 = 80-90%; 7 = 70-80%; 6 = 60-70% ; 5 or less are insignificant
1-10 scales (Mac: 10 = 9.5; no 100%)
AR* 10 = 100%; 0 = no control
MO 8-10 = good; 6 to 7 = fair (partial control or suppression); < 6 = poor; - = no data available
PA 10 = 95-100%; 9 = 85-95%; 8 = 75-85%; 7 = 65-75%; 6 = 55-65%; N = < 55% control (none)
NE 10 = 96-100%; 9 = 90-95%; 8 = 85-90%; 7 = 80-84%; 6 = 70-79%; 5 = 60-69%; 2-4 = <60%; 1 = 0%
Mac interprets: NE: 10 = 9.5 or 9+; 9 = 9; 8 = 8.5 or 8+; 7 = 8; 6 = 7; 5 = 6; 4 = 5; 1-3 = none (N)
AR* ratings used for annual morningglory (tall and ivyleaf) and prickly sida (southern weeds)

Alaphabetical (alpha) scales
EGFP(N) scales: E = excellent; G = good; F = fair; P = poor; N = none; M = marginal (SD)

StateScaleIntergrades
used
Scale
values?
/Comments
IAEGFP GE, FG, and PFNo
KSEGFPGE, FG, and PFNo
WIEGFPNGE, FG, and PFNo
MIEGFPNNoneNo
MNGFPNFG and PF No
ND*EGFPNGE, FG, and PFYes, below
SD*EGFMPG+, F+, M+Yes, below
M = P &
P = N

ND and SD use EGF scale: for SD, E = 90-95%; for ND, E = 90-99%; G = 80-90%; F = 65-80%
ND/SD: P/M = 40-65%; M/P = < 40% = N above
ND* and SD* ratings added for sandbur, kochia, and sunflower
Aaron Hager (hagera@idea.ag.uiuc.edu) and Marshal McGlamery (mmcglame@uiuc.edu), Crop Sciences, (217)333-4424