Complying with the Recommended or Required Spray Droplet Size (or Sizes) and the Spray Volume for Pesticide Application.

            Many pesticide labels have application procedures or other application information. This information is to obtain the best pesticide efficacy while managing spray drift. To assist pesticide applicators, the 2016 Guide for Weed, Disease and Insect Management in Nebraska (EC130) has three pages, double columns on what is listed in the herbicide labels for either recommended or required spray droplet size (or sizes) for application. Along with the droplet size is listed the carrier rate (GPA) on the label. One additional page with double columns lists the information for insecticides and fungicides. Table 1 has the top portion of the first page on herbicides.

Table 1.  Pesticides listing the recommended or required spray droplet size and carrier rate on the label.

Always check label before applying.

 

Herbicides

Herbicides	Droplet Size Classification	Ground Application GPA	Herbicides	Droplet Size Classification	Ground Application GPA
2,4-D amine	C	8 to 20+	Broadaxe	Minimal Amts of Fine Spray	Minimum 10
2,4-D ester #4	C	10+
2,4-D ester #6	C	10+	Bronate 6.3	No Mention	No Mention
AAtrex 4L	C	Minimum 10	Butyrac 200	C-but nozzle types that will provide adequate coverage	Minimum 10
AAtrex Nine-O	C	Minimum 10
Accent Q	M - C	Minimum 15
Acuron	M to C	Pre-Emergence 10 - 80 & Post-Emergence 10 - 30	Cadet	M - C	Min 15; up to 40 for dense canopy or weeds
Affinity BroadSpec	Largest Droplet Size*	Minimum 5 to 20	Callisto 4SC	M to C	PRE:10 to 60 & POST: 10 to 30
Agility SG	Largest Droplet Size*	Minimum 5 to 20
Aim EC	Min Amt of Fine Spray Droplets	Minimum 10	Callisto XTRA	M to C	10 to 30
			Canopy DG	C to VC	Minimum 10

*That provides coverage and control.  M = medium; C = coarse; VC = very coarse.

            For nozzle tip selection and pressure to obtain the recommended or required spray droplet size, the Guide (EC130) has 10 charts: medium, coarse, very coarse at 10 GPA; extremely coarse and ultra coarse at 15 GPA; and medium, coarse, very coarse, extremely coarse and ultra coarse spray droplet sizes at 20 GPA. Two additional charts include glyphosate at 10 GPA and fungicide and insecticides at 15 and 20 GPA. The charts include 15, 20 and 30 inch nozzle spacing and speeds at 6, 7, 8, 10, 12 and 14 mph.