Want to spray your own weeds? Homemade spray outfits can do the job. Lots of Iowa farmers are using them cheaply and effectively.
Sylwester, E. P. and Bakke, A. L.
"Farm Sprayers for 2,4-D,"
Iowa Farm Science: Vol. 2
, Article 3.
Available at: https://lib.dr.iastate.edu/farmscience/vol2/iss6/3