When do I apply Post-emerge Herbicides The weed must be actively growing in order to get control. Depending of the weed species in your lawn you may need to make an early spring application to control over- wintering annual and perennial weeds Common early spring weeds include: –Dandelions, Clover, Chickweed, Henbit, and Mallow
When do I apply? (cont.) Summer is generally not a good time for weed control. The hot dry conditions of summer causes the weeds to quit growing in order for the plant to conserve moisture. Also the turf may be stressed by these conditions. These weeds are best controlled with a late spring application-- not summer: Knotweed Spurge Purslane Plantains Oxalis and others
Broadleaf Herbicides and how they work Different herbicides work well on specific weeds –2,4-D has superior control on dandelions and plantain. –While MCPP (Mecoprop) provides strong clover, chickweed and black medic control. –Dicamba has excellent control on knotweed. When reacted together under the proper conditions, these three herbicides become stronger and more effect on more weeds than if use separately or just mixed together.
1. Understand the weeds you deal with Lifecycles Perennial Annual –Winter –Summer Biennial (not many in turf)
Perennial Weeds Dandelion* White clover* Broadleaf plantain* Creeping Charlie (Ground Ivy) Wild violet Mouse-ear chickweed*… Best time for control of perennial weeds?
Spray wand held correctly, non-swinging arm motion providing a flat band pattern Spray wand turned sideways “swinging arm motion” resulting In a zig zag pattern. Slide of Spray Techniques Used For Training of Applicators Glyphosate mis-application
Current T-Zone Emulsifiable Concentrate (EC) Solvents & emulsifiers are used in the EC formulation to allow the formulation to be mixed with water & form a temporary emulsion in the spray tank. Thus, the milky white appearance when mixed.
Why a new TZone EPA regulations (of course) –VOCs (Volatile Organic Compounds) –VOCs are “ozone precursors” –Regulated under the U.S. Clean Air Act T-Zone EC has VOCs typical of other commercial EC-s in the market.
Solid: (Sulfentrazone) Suspo-Emulsion Formulation A Suspo-Emulsion (SE) is used for a combination of active ingredients with very different physical properties in one formulation. The combination of a suspended solid active(s) & physically stabilized emulsified oil active ingredients in a continuous aqueous phase is defined as a Suspo-Emulsion.
T-Zone SE Contains Suspended solid: Sulfentrazone Oil droplets: Triclopyr ester, 2,4-D ester & Dicamba –2,4-D ester is used as the solvent/emulsifier. Water –Becomes the carrier (solvent) Oil: (Triclopyr + 2,4-D + Dicamba) Solid: (Sulfentrazone)
Improved Profile –Lower VOC EPA won’t let PBI claim low VOCs (go figure) –No solvent –Reduced Phyto Potential due to reduced solvent. –Less odor Same Dependable Performance Benefits of SE Formulation
T-Zone EC vs. T- Zone SE –The difference “SE” on the label The concentrated product will be milky white. T-Zone (EC formulation)
Same ai Load as Current T- Zone –% ai Slightly Less - Due to the product being slightly heavier per gallon. –Lb. ai/gal is the same. T-Zone Contains the exact same amount of active ingredient per gallon
Tzone SE and Tzone EC Comparisons Tzone SETzone EC % A.I.# A.I./Gal% A.I.# A.I./Gal 2,4-D Acid19.44%1.7521.18%1.75 Triclopyr Acid5.55%0.506.04%0.50 Dicamba2.22%0.202.43%0.20 Sulfentrazone0.66%0.060.73%0.06 Specific Gravity 8.98 #/gal8.26 #/gal Water-BasedOil-Based