Broadcast:1-2 lb ai/A. Use 1-2 qt/A Roundup Ultra
4SC.
Spot treatment:1% solution. Use 1 gal Roundup
Ultra 4SC/100 gal spray solution.
Ropewick:Wipe after the plant bolts and is tall
enough to contact the wicks in late June or early July.
For newly planted (nonbearing)apples, peaches,
pears, plums, and cherries.
For established (bearing) apples, peaches, pears,
plums, and cherries.

Poison Ivy

This woody perennial vine or shrub is capable of
climbing a fruit tree. Contact with any part of the plant
may result in an itching, blistering skin rash.
Nonselective postemergence herbicides must be used to
control this weed. Take control measure before vine grows
up the tree trunk.

Roundup Ultra 4SC (glyphosate).Apply in mid-to
late summer after the weed flowers in late June or early
July or in early fall before fall colors appear. Results of the
fall application may not become evident until the
following spring. Best results have been obtained in late
summer after the fruit has formed. (See warnings in the
"Tree Fruit Herbicide Recommendations" section of this
bulletin.)
Broadcast:4-5 lb ai/A. Use 4-5 qt/A Roundup Ultra
4SC.
Spot treatment:2-5% solution. Use 2-5 gal of
Roundup Ultra 4SC/100 gal spray solution. Wet weed
foliage as thoroughly as possible. Use the 2% solution
when 100 percent of the weed foliage can be wet. Use up
to 5% solution when only partial wetting of the weed
foliage is possible. Wet a minimum of 50 percent of the
weed foliage for effective control.
Ropewick:Use with caution. Itching skin rash may
be transmitted by applicator after contacting poison ivy.
Several wipings may be needed to obtain satisfactory
control.
For newly planted (nonbearing) apples, peaches,
pears, plums, and cherries.
For established (bearing) apples, peaches, pears,
plums, and cherries.

2,4-D--1 lb ai/A.Use 1 qt/A Weedar 64 or OLF.
Apply in the fall after harvest but before fall colors appear.
One application may provide suppression only. A second
application 2 weeks after the first application will improve
control. (See warning in the "Tree Fruit Herbicide
Recommendations" section of this bulletin.)
For established apples, pears. peaches, plums, and
cherries.

Quackgrass

and early fall when daily high temperatures range between
65^oand 80^oF (18.3^oand 26.7^oC). High midsummer
temperatures, above 85^oF (29.4^oC) and/or low soil
moisture, cause the weed to become dormant or
semidormant until moisture and cooler weather return.
The weed reproduces by seed and vegetatively by
rhizomes, horizontal underground stems that eventually
curve upward and make new shoots. The seedhead, which
appears in June, resembles ryegrass, except each floret is
rotated one quarter turn compared to ryegrass. The
rhizomes are about one-eighth inch in diameter and may
grow horizontally for up to several feet in length before
curving upward and making a new shoot. Ryegrass does
not have rhizomes.

Roundup Ultra 4SC (glyphosate).Apply in late
spring, May or June, or in the fall, October or November,
when the weed has vigorous healthy foliage, a minimum
of 4 to 6 leaves, and has begun to tiller. Do NOT till the
field or otherwise disrupt the root and rhizome system of
the weeds in the soil for a minimum of 8 months before
treatment.
Broadcast:2 lb ai/A. Use 2 qt/A Roundup Ultra
4SC.
Spot treatment:1 - 2% solution. Use 1 - 2 gal of
Roundup Ultra 4SC/100 gal spray solution. Wet weed
foliage as thoroughly as possible.
Ropewick:Wipe in late May or June after the weed is
at least one foot tall. Not recommended in the fall due to
the prostrate growth habit of the weed.
For newly planted (nonbearing) apples, peaches,
pears, plums, and cherries.
For established (bearing) apples, peaches, pears,
plums, and cherries.

Kerb (pronamide)--2-4 lb ai/A.Use 4 - 8 lb/A
Kerb 50WP. Apply in November when soil temperatures
are between 35^oand 55^oF (1.67^oand 12.8^oC). Primarily
controls perennial grasses, including quackgrass,
bluegrass, ryegrass sp. fescue sp. and also provides early
control of annual grasses the following spring.
Apply Surflan, Prowl, Solicam, or Sinbar the
following May or June for full season annual grass
control. Tank-mix Kerb with 2,4-D and Princep for
postemergence and residual broadleaf weed control.
For established (bearing) apples, peaches, pears,
plums, and cherries.

Virginia Creeper

Virginia Creeper is a woody perennial vine capable of
climbing and smothering a fruit tree. Nonselective
postemergence herbicides must be used to suppress or
control this weed. Remove the vine from the tree during
winter pruning and lay it on the ground. Do NOT "prune
out" the vine. Maximum leaf area is needed for herbicide
application during the summer.

Roundup Ultra 4SC (glyphosate).Apply in mid-
to-late summer after vine flowers in early July, but before

48

1998 New Jersey Commercial Tree Fruit Production Guide