Applying Herbicides Safely and Accurately

Question 1

How are basal applications made, and when can basal treatments be applied?

Answer 1

Basal applications can be made year-round to the lower 18 inches of the stems and exposed roots
(thoroughly wet) to most species of actively growing or dormant plants.

Question 2

What type of application equipment causes the herbicide mixture to flow through the spray
system under pressure and to be released through a nozzle onto the target area?

Answer 2

Hydraulic sprayers.

Question 3

At what pressure do vehicle-mounted sprayers typically run?

Answer 3

Low pressure (15 to 100 psi).

Question 4

What type of sprayer is well suited for treating individual brush plants and for basal and
cut-surface applications?

Answer 4

Backpack sprayers

Question 5

What type of material should be used for hoses on spray equipment?

Answer 5

Synthetic rubber or plastic hoses that have a burst strength greater than peak operating pressures
and that resist oil and solvents that are in pesticides.

Question 6

What type of nozzle patterns work best for rights-of-way weed control?

Answer 6

Regular flat-fan, flood, and cone nozzles are preferred for rights-of-way weed control.

Question 7

What are methods involve cutting the
bark with downward ax cuts around the base
of a tree?

Answer 7

Frill or hatchet. Spray or squirt the
herbicide into the cambium area (growing
wood area inside bark) immediately after
making the cuts.

Question 8

To compensate for pump wear, pump
flow capacity should be ___ percent greater than
the largest flow required by the nozzles and
hydraulic agitation.

Answer 8

20%

Question 9

What are the stengths and weaknesses of brass nozzles?

Answer 9

Brass is inexpensive, but it wears
rapidly, causing a change in application rate and
spray pattern.

Question 10

What are the stengths and weaknesses of nylon nozzles?

Answer 10

Nylon has good corrosion resistance, but only fair abrasion resistance, and it may swell when exposed to
some liquids.

Question 11

What are the stengths and weaknesses of stainless steel nozzles?

Answer 11

Stainless steel nozzles are noncorrosive and resist abrasion, but they are relatively expensive.

Question 12

What are a good alternative to durable and corrosion resistant tungsten carbide and ceramic nozzles (which are expensive).

Answer 12

platic nozzles with stainless steel inserts, hardened plastic nozzles provide added resistance to abrasion.

Question 13

What are the most suitable materials for spray tanks?

Answer 13

Suitable materials include stainless

steel, polyethylene plastic, and fiberglass.

Question 14

What materials are corroded by some pesticides?

Answer 14

Some pesticides corrode aluminum, galvanized, and

steel tanks; therefore, do not use these materials.