Spray volume calculations

[ATH]

Currently estimating some spray jobs (bagworm). I want to use enough spray to be effective, but in trying to be as cost effective as possible, I would like to not spend more $$$ on chemicals than necessary (spray only what is necessary and no more). Is there a formula used to estimate volume of mix per tree? I assume it would use crown spread, live crown height and some kind of a species factor...

Thanks!

 

[smokinj]

Currently estimating some spray jobs (bagworm). I want to use enough spray to be effective, but in trying to be as cost effective as possible, I would like to not spend more $$$ on chemicals than necessary (spray only what is necessary and no more). Is there a formula used to estimate volume of mix per tree? I assume it would use crown spread, live crown height and some kind of a species factor...

Thanks!

I go by sq ft and what the product says to use for that type of insect


sq ft is truck to drip line x height x pie

 

[ATH]

Thanks smokinj...I guess I am a little confused though: Are you using the per acre rate? Most labels for ornamentals say either "spray to cover all foliage" or "spray to run off".

So the label tells me "X" ounces of product per 100 gallons in the tank - but how many gallons am I going to take out of the tank to spray a given tree?


I did find one formula for orchards. Basically, it amounts to a range of 0.7 gallons per 1000 cubic feet (MCF) to 1.0 gallons per MCF. the 1 gallon rate is for unpruned trees or heavy applications. Obviously that it would need to be higher for evergreens - but how much higher?

 

[smokinj]

Thanks smokinj...I guess I am a little confused though: Are you using the per acre rate? Most labels for ornamentals say either "spray to cover all foliage" or "spray to run off".

So the label tells me "X" ounces of product per 100 gallons in the tank - but how many gallons am I going to take out of the tank to spray a given tree?


I did find one formula for orchards. Basically, it amounts to a range of 0.7 gallons per 1000 cubic feet (MCF) to 1.0 gallons per MCF. the 1 gallon rate is for unpruned trees or heavy applications. Obviously that it would need to be higher for evergreens - but how much higher?

you need a good sq ft on what your spraying then you can break it down after that what gun are you using

 

[BC WetCoast]

I don't think you're going to be able to calculate this very closely. There is a wide variation between sprayer on how much they use. Depends on wind, spray technique, nozzle size, tank pressure. Even the gun will affect it as guns of the same make and model will have variation in spray.

I would suggest you take your spray system and go and spray some trees with plain water to get a feel for how much you use.

I spray from a 2 tank truck. 1 tank is straight water and the second tank is mixed product. I only make up enough product for the job at hand (or slightly more). Often the last tree of the job gets 'well' sprayed.

 

[smokinj]

I don't think you're going to be able to calculate this very closely. There is a wide variation between sprayer on how much they use. Depends on wind, spray technique, nozzle size, tank pressure. Even the gun will affect it as guns of the same make and model will have variation in spray.

I would suggest you take your spray system and go and spray some trees with plain water to get a feel for how much you use.

I spray from a 2 tank truck. 1 tank is straight water and the second tank is mixed product. I only make up enough product for the job at hand (or slightly more). Often the last tree of the job gets 'well' sprayed.

all come with time wind speed and gun is hudge I usally figure evey mph wind will change your vol. that much heavy ex: 10mph winds 10% heavy I spray 80 % of the time with a jd9 and very big trees with a canadian riffle at 400psi

 

[pdqdl]

Spray to runoff for most insecticides. Running off the plant does not necessarily mean that you did a good job of treating the plant.

The type of equipment you have determines the amount of spray you will need. In general, higher pressure means smaller droplets, so you will get better penetration into the foliage; you will use fewer gallons of spray to get into all the nooks & crannies.

Longer and smaller diameter hose changes the pump pressure requirements due to pressure drop getting to the gun.

Higher volume (gallons per minute) is what is needed to spray taller trees.

10gpm at 200 psi should be plenty for bagworms on shrubbery.
20 gpm at 450 psi with a 5/8" inner diameter hose should be enough to get 45-50' trees, using the big FMC spray gun.

If you want to spray taller than that, you'd better warm up your wallet for a really big spray rig.

 

[BC WetCoast]

Spray to runoff for most insecticides. Running off the plant does not necessarily mean that you did a good job of treating the plant.

The type of equipment you have determines the amount of spray you will need. In general, higher pressure means smaller droplets, so you will get better penetration into the foliage; you will use fewer gallons of spray to get into all the nooks & crannies.

Longer and smaller diameter hose changes the pump pressure requirements due to pressure drop getting to the gun.

Higher volume (gallons per minute) is what is needed to spray taller trees.

10gpm at 200 psi should be plenty for bagworms on shrubbery.
20 gpm at 450 psi with a 5/8" inner diameter hose should be enough to get 45-50' trees, using the big FMC spray gun.

If you want to spray taller than that, you'd better warm up your wallet for a really big spray rig.

Or borrow a lift truck.

 

[brushbandit]

Spray to runoff for most insecticides. Running off the plant does not necessarily mean that you did a good job of treating the plant.

The type of equipment you have determines the amount of spray you will need. In general, higher pressure means smaller droplets, so you will get better penetration into the foliage; you will use fewer gallons of spray to get into all the nooks & crannies.

Longer and smaller diameter hose changes the pump pressure requirements due to pressure drop getting to the gun.

Higher volume (gallons per minute) is what is needed to spray taller trees.

10gpm at 200 psi should be plenty for bagworms on shrubbery.
20 gpm at 450 psi with a 5/8" inner diameter hose should be enough to get 45-50' trees, using the big FMC spray gun.

If you want to spray taller than that, you'd better warm up your wallet for a really big spray rig.

With the big FMC gun, disc sizes makes a considerable difference in spray height and material used.

 

[pdqdl]

With the big FMC gun, disc sizes makes a considerable difference in spray height and material used.

Well...yes and no.

The disc size will determine the pressure and volume for any given system. If your pump delivers 20 gpm at 350 lbs to the gun, and you have put in a #18 disc, the entire volume of the pump will blow out the hole at less than the regulated pressure.

On the other hand, if you install a teeny little #10 disc, you will get 350 lbs of atomization, but it will lack sufficient volume to get as high as a #12 or #14 disc.

If all you are spraying is little trees and bushes, putting the smaller disc in is a great way to save on water and chemical, as well as getting good penetration.