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Author Topic: Do PPB infest pine?  (Read 1336 times)

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Offline GeneWengert-WoodDoc

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Re: Do PPB infest pine?
« Reply #20 on: June 19, 2018, 10:54:58 PM »
I corrected a typo in my note #18.

Does any of the literature from the manufacturer of Timbor, or do any of their instructions, suggest specifically that Timbor can be used/sprayed on freshly sawn lumber at the sawmill?  If so, do they state that several treatments should be applied, and 10% or 15%, and how long between treatments?  Why would a manufacturer not specifically mention this use in order to increase sales?  There must be a reason...legal or technical.  

I think it MIGHT be that the leaching into the soil of some of the borate chemical from the lumber in an air drying yard, leaching from rain on the lumber month after month, would create a major pollution liability, especially if the borate gets into the nearby drinking-water wells or if the runoff goes into a creek where there are fish.  Note that they do state that the product should not be used where the wood is subject to excessive rain; an air drying yard in much of the US would qualify as having exposure to excessive rain, if over 30" a year is excessive.  As mentioned, years ago we did measure this leaching in air drying when I was at Virginia Tech.
Gene - Author of articles in Sawmill & Woodlot and books: Drying Hardwood Lumber; VA Tech Solar Kiln; Sawing Edging & Trimming Hardwood Lumber. And more

Online Don P

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Re: Do PPB infest pine?
« Reply #21 on: June 20, 2018, 05:19:32 PM »
What you are saying is a valid concern at some level, dose makes the poison. My soils are still testing boron deficient.


Quote
Borax has been in use as an insecticide in the United States with various restrictions since 1946. All restrictions were removed in February 1986 due to the low toxicity of borax, as reported in two EPA documents relating to boric acid and borax.
EPA has determined that, because they are of low toxicity and occur naturally, boric acid and its sodium salts should be exempted from the requirement of a tolerance (maximum residue limit) for all raw agricultural commodities

From Nissus, the manufacturers of Tim-bor;
"Works best when wood has higher moisture content"

From the Tim-bor treatment calculations spreadsheet;
"Pounds of Tim-bor needed: multiply gallons  by 1.5 for a 15% solution for a single application. A 10% solution requires 2 applications."


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