Application Rates

[rfwoodvt]

I am very new to the concept of tree spraying so this may be a lame question but I'm asking anyway.

I'm wading through fungicide labels trying to understand application rates and had assumed they would somehow refer to a per tree rate or something similar for foliar applications.

Unfortunately everything seems to based on the land area of application such as hectares, acres and square feet. From a crop or field perspective this makes sense but how do we adapt it to a per-tree basis?

For example lets say I want to treat one Picea pungens for Rhizosphaera spp. needlecast. And lets say the tree is 30 foot tall by 10 foot spread and the root zone is limited to 1000 square feet.

I just looked at a daconil label and for that tree and disease it gave a rate of 9.5 liters of product per acre mixed in 100 to 1000 gallons of water.

How in the world to I translate the land area application rates for use in that one tree?

Or have I missed that section of the label?

 

[cerviarborist]

Easy, call the manufacturer and talk to their tech support. Most companies have propeller heads on staff to handle questions like that. They'll suggest alternate application methods, or alternative products.

 

[UrbanForester]

When looking at a label the "rate: is determined by the disease you are trying to control. Most rates for tree applications are based on "per 100 gallons". Then you spray the tree to "drip" using the established rate. If you are using the Daconil with 72% AI then you will mix 22 oz per 100 and spray until all needle tissue is wet.

 

[cerviarborist]

You can also contact the manufacturer and ask for a rate or product for lawn and landscape. rather than crop applications.

 

[rfwoodvt]

Thanks for all the input so far.

Calling the mfg is certainly an option but in limited, other experiences, I have found that the stock answer of "follow the label instructions" is about all I have gotten. Which means, they read the label to me and leave it at that.

I also get the admonition, "if it is not on the label you can't do it."

But, I finally found a label that said exactly what UF mentioned. A mix rate per gallon and how to apply it to the tree, "Spray until it runs off the foliage."

The hardest part was finding a label online! They are there but just try searching on Daconil or Clorothalonil or bordeaux mixture along with the keyword Label and about all you get are extension service bulletins saying "Use blahblahblah and be sure to follow the label.."

So, now that I know that the labels will somewhere say how much per 100 gallons I can/should mix the next question is how many gallons do I actually mix.

Clearly I won't need 200 gallons for a 30 foot tree.

How do y'all go about estimating the amount you will need to mix for a single tree?

 

[tomthetreeman]

Rick, 'apply until runoff' is a standard statement as you are finding. Tough to calculate the surface area of a tree LOL.

Instead of 'label,' type in MSDS, you should have more luck with that.

http://www.syngentaprofessionalproducts.com/pdf/labels/SCP50534202AL1E0709.pdf

-Tom

 

[treegazer]

I like to mix small batches. If I run out I can mix a little more. This way your not stuck with 20 gallons that you can't use.

I was looking Daconil up this morning and I found the label through Syngenta's site very easily. I also looked up Bravo. I'm not sure of the cost of these products but the Bravo has a lower mix ratio than the Daconil.

I like how the label states the maximum height for application is ten feet above the tallest plant you are treating.

And one label said not to apply through high pressure sprayers yet it does not define high pressure. Is 85 psi high?

 

[UrbanForester]

The best place to find labels is: www.cdms.net (Crop Data Management Systems) They carry about 90% of all products sold in the U.S. Click on T/O (Turf + Ornamental) and you're off and running. They can be downloaded for free. I agree with the others here, small loads if your spraying just a couple trees. A 400 sq. ft Blue Spruce will only take about 3 to 5 gals. to spray properly. Once mixed most products will lose effectiveness over time, some faster than others. By the way tanking mixing a combination of fungicides with different modes of action increases effectiveness and reduces resistance possibilities. Using Chorothalonil(contact) with a Thiophanate Methyl (Clearys 3336 - systemic) or rotating them helps w/control and resistance.

PS. if you tried to PM me, I can't download it, try me here:mtsmgr@gmail.com