-8-


 12. If boom spray equipment is not practical, either hand guns adjusted
 for large-droplet, coarse sprays or off-center nozzles may be used.

 13. To use row-crop sprayers after cleaning spraying pressure at the
 boom or hand gun should be reduced to 50 60 psi; large, coarse orifices
 should be used; and, 2,4-D and 2,4,5-T materials should be applied at 20
 to 50 gpa of solution while other weed killers should be applied at about
 75 to 100 gpa as foliage wetting sprays. Equipment should be cleaned after
 use.

 14. If weed growth is very dense and coarse and difficult to wet, it
would be best to mow or chop back area and then apply herbicides to lower
and more tender regrowth.

 Cleaning row-crop sprayers:

 15. Before using herbicides, especially if sprayer has been used to
 apply copper-containing fungicides: Use one gallon of commercial acetic
 acid per 100 gallons of water. Operate sprayer, agitate thoroughly and
 fill hose lines and boom with solutions. Allow solution to stand two
 hours then drain and flush system with several rinses of fresh water.

 16. After applying herbicides: after salt formulations of 2 4-D and
 2,4,5-T; use one of the following per 100 gallons of water: (a.) 2 Ibs.
 of lye (sodium hydroxide); (b.) 5 lbs. sal soda (sodium carbonate);
 or (c.) 1 gallon of household ammonia. After low volatile ester formulation
 of 2,4-D and 2,4,5-T; use one of the following per 100 gallons of water
 (d.) 2 Ibs. lye; (e.1 5 Ibs. sal soda plus 1 pint of emulsifier plus 5
 gallons of diesel oil.

 17. Line strainers, piping, hoses and booms should be cleaned by
 operating the sprayer during 15 or 16 above. All cleaning -should be
 followed by thorough flushing with fresh water. Waste from cleaning
 operations should not be discharged on crop land.

 Herbicide spraying practices; 2,4-D and 2,4,5-T especially:

 18. Know what you are buying and using: read and observe labels.

 19. Use large orifice, coarse droplets sprays with lowest pressure that
 will give desired spray coverage and distance. (Atomization of sprays into
 fine mist causes drift loss and affords poor wetting.)

 20. Do not mount boom excessively high or point spray gun at sky to get
 coverage; this causes additional drift loss and possible hazard to adjacent
 areas when windy.

 21. When using hand guns: spray to wet foliage and then move on.

 22. Do not spray when windy Stop if wind is more than 5 mph, especially
 if blowing toward cropped areas less than 1 mile away. Do not spray within
 one-half mile of floral or other sensitive crops if wind is greater than
 2 mph. Under 2 5 mph winds spray if no crops are downwind. Use caution
 near sensitive crops.