Calibration and Uniform Application

In order to get the most out of a herbicide program, the herbicide must be applied accurately and uniformly. This is particularly difficult when applying granular herbicides. !

# 1 Landscape Weed Control Challenge: Proper Application!!!!

Herbicides are applied on a Per Area Basis! NOT oz per gal!

YES:
oz per 1000 sq. ft.
oz per gallon applied to 1000 sq. ft.

NO:
oz per gallon
% (exception - Roundup)
oz per backpack

Granules: uniform spread
Pre-measure amount for area; See table 1 for pre-measure amounts for circular landscape beds
Spread herbicide over the area in different directions at least 3 times

Sprays: Calibrate sprayer. Output per area basis! .
Maintain constant - pressure, walking speed, nozzle height. Today pretend you are a tractor!
Broadcast vs. directed; Broadcast is preferred; yet directed applications in tall trees & shrubs are practical.

Rarely do we use % by volume. Exceptions - spot applications of glyphosate, glufosinate and spray adjuvants

% = percent = # per 100

So, 2 % = 2 ounces in 100 ounces

= 2.5 ounces per gallon (1 gallon = 128 ounces)

0.25% Surfactant in 1 gallon --- 0.25% is 0.25 per 100

128 ounces x 0.0025 = 0.32 ounces

NOT 32 ounces!! That would be 25%

Grams of granular herbicides needed for circular landscape beds of various diameters