# Blindside Herbicide Calculation

Discussion in 'Pesticide & Herbicide Application' started by cutman2000, Jul 18, 2017.

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1. ### cutman2000LawnSite Senior MemberMessages: 328

Hello Lawn World,

#1.
I have a bottle of Blindside, not the one with the builtin measuring spout. It has instructions for per 1000 sq ft. So I sprayed my pump sprayer(with water) to cover 1000 sq ft to find out how much liquid I'd used for 1000 sq ft, and measured that(6.5 cups water=1000 sq. ft. in my container). Now, on the instructions it stats to add 0.15-0.23 per 1000 sq ft. on warm season grasses. So do I just add .15-.23 to every 6.5 cups until my container is full(ex.,78 cups of water, if I'm doing 12,000 sq. ft.)?
#2.
This question may sound stupid. The 0.15-0.23 are units of weight, from an ounce. So these are fractions of an ounce? And these are measured by weight not by volume? I can use a digital scale to get the .15 or .23, right?

2. ### RigglePLCLawnSite Fanaticfrom Grand Rapids MIMessages: 15,607

So..you ARE USING 2 GALLONS OF WATER AND AT 52 OUNCES PER THOUSAND SQFT YOUR 2 GAL SPRAYER COVERS 4.9 THOUSAND SQFT.
yOU NEED .23 OUNCE TIMES 4,9, WHICH IS 1.127 OUNCES.
wATER IS EASIER TO MEASURE THAN CHEMICAL SO USE I OUNCE OF CHEMICAL AND 1.77 GALLONS OF WATER.

sORRY--MY CAP LOCK KEY STUCK.

3. OP

### cutman2000LawnSite Senior MemberMessages: 328

The 6.5 cups was actually a 1 gallon sprayer. The 2 gallon sprayer was 5 and 1/8 cups per 1000.

4. ### RigglePLCLawnSite Fanaticfrom Grand Rapids MIMessages: 15,607

I think, with your 2 gallon sprayer, you are applying 41 ounces per thousand sqft. A two gal sprayer covers 6.2 thousand sqft.
You need 6.2 times .23 that is 1.4 ounces per two gallons.

Or for simplicity, use one ounce and 1.5 gallons.

5. OP

### cutman2000LawnSite Senior MemberMessages: 328

I'm coming up with .45 oz to 1.5 gallons.

6. ### scottatbhmLawnSite Memberfrom Birmingham, AL 35173Messages: 27

12 * .15 = 1.8
12 * .23 = 2.76
12 * 6.5 = 78

7. OP

??
??

8. ### FpholtonLawnSite Memberfrom AlabamaMessages: 8

we have been running .23 oz per gallon,

our backpack sprayers(stihl) are running at 1k sq ft per gallon.

We have seen great results using blindside at this rate on warm season turf, especially with broomsedge and doveweed

9. OP

### cutman2000LawnSite Senior MemberMessages: 328

I recorded my handheld 2 gallon pump sprayer at 1000 sq ft per half a gallon. Does that sound unusual?

10. ### RigglePLCLawnSite Fanaticfrom Grand Rapids MIMessages: 15,607

Cutman, that is not at all unusual. A half-gallon per thousand sqft is fine for a hand sprayer or backpack.
Actually, a quart per 1000 sqft is probably better. You would be at the same rate as the Permagreen Triumph.
Lower the pressure, or walk a little faster. If you can apply at a quart per thousand sqft--you will cover a lot more ground before needing to refill.
A pressure gauge or CF (constant flow) valve is a big help in keeping the pressure and flow rate per thousand constant.