7- .

Forestry Bulletin R8-FB/P 16

c

United States

Department of

Agriculture

s-ii

April 1985

FOREST PESi- MANAGEMENT

Forest Service

lechnology Update SarthenmUSOAFmaSavice*17y Rkhtree Rd., N.W..AUmta Ga 30367

Forestry Pesticides Fact Sheet Number 4

EFFEClYVE?=S01FHEXAZlNONEMAF~ HERBICIDE

Hexuinone has proven to be a useful herbicide in southern forestry. Its effectiveness in

controlling many woody and herbaceour weeds

at application rates tolerated by pines provides

foresters with a sdective vegetation management tool. Hexuinone is an environmentally

safe chemical because lt is low in toxicity, Is

degraded readily, does not bioaccumulate; and

does not impair water quality. It is registered

for use In pine reforestation for site preparatio n, release from woody and herbaceour

weeds, individual hrdwood stem controb and

herbaceous weed control. Formulations labeled

for forestry use include a water-soluble powder

(90 percent active ingredient), a water-dispersible liqui& and free-flowin

f

granuks (E and

l&percent active hgredlent.

HexuinoneQ effectiveness in controlling important forest weeds has been documented by a

number of studies. The more important ones

are listed in this fact sheet. Contact the

authors of this fact sheet for a more compkte

Ilrt.

l4exazlrono Roferorcos

Barber,, T. Georgia tests a new forest herbicide.

In: Proceedings,. Southern Weed Science

Sodety; Chvnpaign,, IL: Weed Science Society

of America; 1979; 32: 198-205.

Cantrdl, Richard L.; Flinchum, D. M.; Neary,

D.G. The effects of eight herbicides on turkey oak (Quercur laevir Walt.) topkill and

sprouting. In: Proceedings,, Southern Weed

Science Society; Champaign, IL: Weed Science

Society of America; 1984, 37: 142.

lVelpar herbicide, Velpar LeT Pronone’@SGp

and Pronone@lOG.

Fitzgerald, Charles H. Herbaceous weed control wlth hexuinone in loblolly pine (Pinus

g8dll)9;;antations. Weed Science. 27(6):583-

i

.

Fitzgerald, C. H.; Fortson, J. .C.Applicatlon

time effect of hexarinone for forest site preparation. In: Proceedings, Southern Weed

Science Society; Champaign, II: Weed Science

Society of America; 1981; 34: 197-302

Gonzalez+ F. Eugene. Southern pine release

wlth hexuinone formulations. In: Proceedingr, Southern Weed Science Society; Champaign, II: Weed Science Society of America;

1983; 36: 223-229.

Gonzalez, F. Eugene; Webb, A.L. Weed tree control with hexarinone injections. In: Proceedings, Southern Weed Science Society; Champafgn, IL: Weed Science Society of America;

1981; 34: 177.

Griswold, H.C.; Fitzgerald,C.H.; PresndC, R.F.;

Gonzalez,, F.E. Pine release with aerially applied liquid hexulnone. In: Proceedings,

Southern Weed Science Society; Champaign,

IL; Weed Science Sodety of America; 1984;

37: 230-233.

GriswolQ H.C.; Gonzale& F.E. Application of

Velpa herbicide by bandlng in newly establis hed plantations. In: Proceeding+ Southern Weed Science Society. Champaigq IL:

Weed Science Society of America; 1981; 34:

165-173.

Meyer, R.E.; Bovey, R.W. Hexazinone and other

herbicides on Texas woody plants. Weed

Science. 28: 3!%-362; 1980.
.I,‘.....-...b e...., . - . . . . . . . ,:. ,, .: . . ;_

Michael, J. L. Fonnulation,.rate and season of

application effects of hcxuinonc (Vclpu”

Gridball) on oak topkill. In: Proceedings,

Southern Weed Science Society; Champaign,

IL: Weed Science Society of America; 1980;

33: 110-113.

Michael, J.L. Effect of pellet size on defoliation

and estimated kill of small stems“ treated

with hcxarinonc. In: Proceedings, Southern

Weed Science Society; Champaign,. IL: Weed

Science Society of America; 1981; 34: 192-

1%.

Michael,. J. L. Impacts of rate of hexazinonc application on survival and sowth of loblolly

pine. in: Proceeding% Southern Weed Science Society; Champaign, IL: Weed Science

Society of America; 1984; 37: 210-212.

Miller, j. H. Soil-active herbicides for singlestem and stand hardwood control. In: Proceedings., Southern Weed Science Society;

Champaign, IL: Weed Science Society of

America; 1984; 37: 173-181.

Minogue, P. J.; Gjcrstad, D.H.; Nelson, L. R.;

Glovcr, G.R.; Knowe, S.A. Development of

hcxazinone formulations for pine release.

In: Proceedings, Southern Weed Science Society; Champaign, IL: Weed Science Society of

America; 1982; 35: 157-160.

Ncaryf D.G.; Bush, P.B.; Douglass, J.E. 2-6

and 14-month efficacy of hexazinone ,for site

preparation. In: Proceedings, Southern

Weed Science Society; Champaign, IL: Weed

Science Society of America; 1981; 34: 181-

191.

Nelson, Larry D.; Pcdcrson, Richard C.; Autry,

Lanny L. ; Dudlcy, Stuart ; Walstad, John D.

Impacts of hcrbaccous weeds in young loblolly pine plantations, Southern journal of

Applied Forestry. S(3): 15s-158; 1981.

Nicklcs, J.K.; Tauer, C.G.; Stritzkcr Jl. Use of

prescribed fire and hcxazinone (Velpar) to

thin understory stortlcaf pine in an Oklahoma pine-hardwood stand. Southern Journal of Applied Forestry. S(3): 124-127; 1981.

O’Laughlin, T, C.; Nelson, L.R.; Walstad, J. D.;

Breland, J.H.; Voeller, J.E. Vclpar and

other preemergence herbicides for USC in cstablishment of ioblolly pine plantations.

In: Proceedings, Southern Weed Science

Society; 1976; 29: 262-268.

Parker, J.A. Control of single oak trees (Quercus spp.) with hexazinone pellets. In:=

Gdings, Southern Weed Science Society;

1979; 32: 213-216.

Scifrcs, Charles J.; Rasmussen, Allen; Mutz,

James L.; Koerth,. Benjamin H. Susceptibility

of selected woody plants to hcxazinonc on

south Texas rangelan d. Weed Science. 32:

482488; 1984.

Webb, A.L.; Nelson, L.R.; Gjerstad, D.H. Loblolly pine release from brush competition

with three hcxuinone formulations in the

Alabama Piedmont. In: Proceedings, Southern Weed Science Society; 1981; 34: 153-156.

The utthon .-This fact sheet was prepared

by Daniel G. Neary, USDA Forest Service, Southiastxrzt Experiment Station (904-392-1951)

Jerry L, Michael,. USDA Forest Service, Southern

Forest Experiment Station (205-826-8700); Parw-- shall B. Bush, University of Georgia (404-E

7690); and John W. Taylor, Ir,, USDA Forest

Service,. Southern Region (404-881-2718). For

further information,. contact any of these

authors at the listed telephone numbers.

The use of trade, firm, or corporation names

in this publication is for the information and

convenience of the reader. Such use doer not

constitute an official endorsement or approval

by the U. 5. Department of Agriculture of any

product to the exclusion of others that may be

suitable.

CAUTION: Use pesticides selectively and

carefullly. Follow recommended practices for

the disposal of surplus pesticides and pesticide

containers. Some States have restrictions on

the use of certain pesticides. Check your local

and State regulations. Also, because rcgistrations of pesticides arc under constant review by

the Environmental Protection Agency, consult

your State forestry agency, county agentr or

State extension agent to be sure the intended

use is still registered.