Introduction

80
Effect of Rainfall on Herbicide Efficacy
Required Interval
Product
15 minutes Diquat
30 minutes clodinafop
1 hour Axial, Axial Xtreme, Barricade II, Broadband, Bromoxynil, Bromoxynil/MCPA ester, clethodim, Enforcer
D, Enforcer M, Everest GBX, fenoxaprop, flucarbazone, ForceFighter M, Gramoxone, Harmony SG, Infinity,
Paradigm, Pixxaro, Poast Ultra, Predicade, Pulsar, quizalofop, Refine SG, tralkoxydim, Traxos, Tundra, Varro,
Velocity m 3
2 hours 2,4-D LV Ester, Aatrex (post-emergent application), Ares, metsulfuron+2,4-D LV Ester, fluroxypyr + 2,4-D
ester, MCPA Ester, Simplicity, Travallas
3 hours Altitude FX/FX2, dicamba/mecoprop-p/MCPA, Odyssey, Odyssey Ultra, Solo, Solo Ultra
4 hours Accent, metsulfuron + 2,4-D Amine, 2,4-D Amine, Battalion (post-emergent application), Cirpreme,
Distinct (post-emergent application), Enforcer MSU, Liberty (both), Manipulator 620, MCPA Amine,
Overdrive, Permit (post-emergent applications), Prism, Reflex, Signal FSU, Tandem, thifensulfuron/
tribenuron 75% WGD, Ultim
6 hours Curtail M, Glykamba, imazamethabenz, MCPA-K, MCPA Sodium Salt, metribuzin, Muster, Option, Prestige
XC, quinclorac, Tordon 22K, Tribenuron, Triton C, Triton K, Ultra Blazer
8 hours Basagran, CleanStart
No specific
recommendation*
2,4-DB, Aim, Amitrol 240, Bromoxynil/2,4-D ester, clopyralid, dicamba, dichlorprop/2,4-D, DyVel, DyVel
DSp, Enforcer D, Escort, Express FX, florasulam/fluroxypyr + MCPA, florasulam + 2,4-D, florasulam + Curtail
M, florasulam + glyphosate, florasulam + MCPA, fluroxypyr+MCPA, fluroxypyr+MCPA+bromoxynil,
glyphosate, Grazon, Hat Trick, Harmony K, imazethapyr, Korrex, Linuron, MCPB/ MCPA, mecoprop-p,
Momentum, Optica Trio, Pinnacle, Pulsar, Reclaim, Restore II, Salute, Tensile, topramazone, tribenuron/
metsulfuron, Viper ADV
* The products listed make no specific time recommendation on the label. The required rainfree period could be up to 8 hours.
See the product page in the guide or consult the product label.
Note: The term “Rainfastness” refers to the time needed between application and rainfall to avoid significant reduction in
efficacy. Rainfall shortly after application of most post-emergent herbicides may reduce weed control. Effect will vary with
product, the interval between spraying and rainfall and the intensity and duration of the rainfall. These guidelines are based on
label information. Use the longest time interval on the component products when considering tank mixes.