Various mites and bugs are destroying my junipers and Italian cypresses, big
time. I would like to spray them with Acephate (Orthene). The HD sells it in
small bottles at outrageous prices ("Systemic Insect Killer" by Ortho). It
comes in a 8% solution.
On the web I can buy 98% Acephate powder by the pound for only a few
How much water would I use to dilute one pund or one ounce of the powdered
98% acephate (sold by
weight) so that I would get an 8% or 10% solution?
The MSDS that I found for Orthene showed 9.4% by weight of acephate
dissolved in a solvent other than water. Note that the density of
Orthene is specified to be 6.9 lb/gal and it's 'miscible', not soluble
in water. This makes me believe that the acephate is dissolved in an
undisclosed organic solvent at a ratio of 9.4 grams of acephate in 90.6
grams of solvent to yield a 9.4% w/w solution. To measure out 9.4 grams
of acephate accurately use a laboratory balance.
The resulting solution can then be mixed with water to get the solution
to be applied.
If you're not comfortable selecting an appropriate solvent and weighing
the components, I'd recommend buying the more expensive Orthene.
Please keep in mind that "miscible" means soluble in any ratio. As in
99%-"A", 1%-"B" or the other way around or anywhere in between.
This "miscibility" may depend on Orthene being 9.4% acephate, 90.6%
solvent or solvent mixture that is miscible with water.
Solvents lighter than water and miscible with water will probably be
lighter alcohols, maybe acetone or MEK, or similar.
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