Strawberry and Raspberry Pest Management in Wisconsin

Table 10. Weed management for raspberries
40
Scythe provides only “burn-down” of weeds. It acts very quickly but is
not systemic and weeds will often regrow. It may work for spot
treatment or in controlling annual weeds in small patches. It will not
control perennial weeds. Scythe is selective only through selective
application. In raspberries Scythe can be used to burn down excessive
cane growth. Apply before canes become woody.
Timing Commercial product, rate/acre Active ingredient, rate/acre Remarks
NEW PLANTINGS—FIRST SEASON (nonbearing)
Early spring
(planting)
Control weeds mechanically and plant in a weed-free field.
Control perennial weeds the fall before planting.
Midsummer Mulch beds or use shallow cultivation, if necessary.
Fusilade DX, 1.0–1.5 pt fluazifop-P-butyl,
0.25–0.375 lb
Poast, 1.5–2.5 pt sethoxydim,
0.3–0. 5 lb
Postemergence. Do not apply closer than 1 year before
harvest. Only effective against grasses. Add either crop oil to
the extent of 1% of the spray solution or nonionic surfactant at
0.25% of final solution.
Postemergence. Do not apply closer than 45 days before
harvest. Only effective against grasses. Add surfactant
according to label directions. For maximum effectiveness,
grasses must be actively growing and annual grasses must be 3–
8 inches tall, perennial grasses 4–8 inches tall, and quackgrass
6–8 inches tall at time of application.
several formulations clethodim Postemergence. Effective only against actively growing grasses.
Rate is determined by grass species and growth stage. See the
label for details. Check label for adjuvant requirements.
Scythe, 1% or 10% solution pelargonic acid Postemergence. Selective only by selective application. Will
burn down any green tissue. Scythe is not systemic: it won't kill
most weeds, but it will burn off the sprayed foliage. Best
applied as a spot treatment or with a shielded sprayer. See the
product label for specific rate suggestions. Controls excessive
cane growth if applied before canes become woody.
Late fall Princep or Simazine,
4L, 2.0–4.0 qt; or
90DF, 2.2–4.4 lb
NEW PLANTINGS—SECOND SEASON (bearing)
simazine, 2.0–4.0 lb Use rate varies by soil type. Apply 2-4 lb active ingredient (ai)/a
in the spring or apply a split application of 2 lb ai/a in the
spring plus 2 lb ai/a in the fall. Apply in a minimum of 40 gallons
of water per acre. On plantings less than 6 months old, use ½ of
the above rate. Do not apply when fruit is present or illegal
residues may result. See label for maximum annual use and soil
type restrictions.
Early spring Casoron 4G, 100.0 lb dichlobenil 4.0 lb Preemergence. Very late fall or early spring application.
Effective on established quackgrass and dandelions. Apply
when temperatures are below 50°F. Dichlobenil is volatile and
will be lost if soil incorporation does not follow shortly after
application. Sprinkler irrigation or rainfall within hours after
application is very helpful. Effective for 6–8 weeks after
application. Suppression of cane growth may occur following
application. Use if perennial weeds (quackgrass, dock,
bindweed, dandelion) predominate; otherwise use Princep .
Devrinol
10G, 40.0 lb; or
50DF, 8.0 lb
*Gramoxone Inteon,
2.0–4.0 pt
napropamide 4.0 lb Preemergence. Apply before weeds emerge. Because this
herbicide is inactivated by sunlight (ultraviolet), the treated field
must have 1/2 inch of irrigation or rainfall or be mulched within
24 hours after treatment. This treatment should give full-season
control of most annual weeds.
*paraquat, 0.5–1.0 lb Postemergence. Directed spray only. Apply before emergence
of new canes or shoots as injury can occur. Apply as a coarse
spray to avoid crop injury. Add either crop oil concentrate or
nonionic surfactant according to label directions.
* Restricted-use pesticide—can only be applied by a certified applicator. (continued)