General Information


Poast Plus herbicide is a selective, broad spectrum, postemergence herbicide for control of annual and perennial grass weeds. Poast Plus does not control sedges or broadleaf weeds. Essentially, all grass crops, such as sorghum, corn, small grains, and rice, as well as ornamental grasses, such as turf, are susceptible to Poast Plus.


Poast Plus rapidly enters the target weed through its foliage and translocates throughout the plant. The effects range from slowing or stopping growth (generally within 2 days), to foliage reddening and leaf tip burn. Subsequently, foliage burnback may occur. These symptoms will generally be observed within 3 weeks depending on environmental conditions.


All labeled crops are tolerant to Poast Plus at all stages of growth.


Repeated use of Poast Plus (or similar postemergence grass herbicides with the same mode of action) may lead to the selection of naturally occurring biotypes with resistance to these products. If poor performance cannot be attributed to adverse weather conditions or improper application methods, a resistant biotype may be present. Consult your local representative or agricultural advisor for assistance.


In irrigated areas, it may be necessary to irrigate before treatment to ensure active weed growth.


DO NOT cultivate within 5 days before or 7 days after applying Poast Plus. Cultivating 7 days or later after treatment may help provide season-long control.


Applications can be made to actively growing weeds as aerial, broadcast, band, or spot spray applications at the rates and growth stages listed in Tables 1, 2 and 3, unless instructed differently in section VI. Crop-Specific Information. The most effective control will result from making postemergence applications of Poast Plus herbicide early, when weeds are small. Delaying application permits weeds to exceed the maximum size stated and may prevent adequate control.

Apply Poast Plus to the foliage of grasses uniformly and completely because large leaf canopies shelter smaller weeds and can prevent adequate spray coverage. DO NOT spray to the point of runoff.


For ground boom applications, apply with nozzle height no more than 4 feet above ground or crop canopy.

DO NOT apply when conditions favor drift from target area or when windspeed is greater than 10 mph.

Water Volume: Use 5-20 gallons of spray solution. In the West and in the High and Rolling Plains Region, (see regional descriptions in Table 1), DO NOT use less than 10 gallons of spray solution per acre.

Spray Pressure: Use 40-60 psi (measured at the boom, not at the pump or in the line). When crop and weed foliage are dense, use a maximum of 20 gallons of water and 60 psi.

Application Equipment: Use standard high-pressure pesticide flat fan or hollow cone nozzles spaced up to 20 inches apart. DO NOT use flood, whirl chamber, or controlled droplet applicator (CDA) nozzles as erratic coverage can cause inconsistent weed control. When tall weeds such as volunteer corn are to be controlled, the boom should be high enough to cover the entire plant. Refer to the nozzle manufacturer’s directions for recommended height. When a crop such as cotton is 24 inches or taller and the grasses are below the crop canopy, use drop nozzles to ensure good coverage of the grass species.

DO NOT use selective application equipment such as recirculating sprayers or wiper applicators.


Poast Plus herbicide may be applied by banding to control annual grasses. Banding is not recommended for perennial grasses.

Follow Ground Application (Broadcast) instructions for band applications.


DO NOT make spot treatments in addition to broadcast or band treatments. When using knapsack sprayers or high-volume spray equipment with hand guns or other suitable nozzle arrangements, prepare a 1-1.5% solution of Poast Plus in water unless otherwise specified under specific crops. Use a concentration of 0.5% for Dash HC and Sundance HC spray adjuvants, or 1% for oil concentrate. Prepare the desired volume of spray solution by mixing the amount of Poast Plus and the amount of Dash HC, Sundance HC or oil concentrate in water according to Tables 5 and 6.


If Poast Plus herbicide cannot be applied at the recommended time, larger annual grasses may be controlled with a later application by increasing the rate of Poast Plus (see Table 3). Do not exceed the maximum rate per acre, per season, for specific crops (see Table 7).


- Maximum seasonal use rate: See Table 7 for crop-specific maximum seasonal use rates.

- Preharvest Interval: See Table 7 for crop-specific preharvest intervals.

- Restricted Entry Interval (REI): 12 hours

- Avoid all direct or indirect contact with any desired grass crop unless otherwise recommended on the Poast Plus herbicide label.

- Stress: DO NOT apply to grasses or crops under stress due to lack of moisture, hail damage, flooding, herbicide injury, mechanical injury, or widely fluctuating temperatures, as unsatisfactory control may result. In irrigated areas, it may be necessary to irrigate before application to insure active weed growth.

- DO NOT apply to crops that show injury (leaf phytotoxicity or plant stunting) produced by any other prior herbicide applications, because this injury may be enhanced or prolonged.

- DO NOT apply as a preplant or pre-emergence treatment before planting grass crops, such as corn, millet, or sorghum, unless otherwise specified on supplemental labeling.

- DO NOT use selective application equipment such as recirculating sprayers, wiper applicators, or shielded applicators.

- Rainfast Period: Poast Plus is rainfast 1 hour after application.

- DO NOT apply through any type of irrigation equipment.

- DO NOT plant other crops to be harvested for 30 days after application unless Poast Plus is registered for use on that crop.

Limitations, Restrictions, and Exceptions


Only Poast Protected sweet corn hybrids are tolerant to Poast Plus applications. Severe crop injury will occur to sweet corn hybrid’s not labeled as Poast Protected sweet corn.

Applications of Poast Plus in Poast Protected sweet corn may be made until the onset of pollen shed. DO NOT apply Poast Plus after pollination occurs. A second application of Poast Plus in Poast Protected sweet corn may be made 10 days or later following the first application.

PHI: 45 days (grain or fodder) 30 days (fresh sweet corn or forage and silage)

Quackgrass: Add nitrogen to the crop oil concentrate to improve grass control on indicated species. Cultivate 7 14 days after an initial or sequential application to aid control.

- Use 3.75 pints per acre for the following forage crops: alfalfa, clover, birdsfoot trefoil, sainfoin.

Refer in the label for specific information and rates recommendation.

Restricted Entry Interval

12 hours