For use in the following agricultural crops: chickpea (garbanzo bean), Clearfield corn, dry field pea, English pea, and soybean
Directions For Use
It is a violation of federal law to use this product in a man-ner inconsistent with its labeling. This labeling must be in the possession of the user at time of herbicide application.
DO NOT apply this product in a way that will contact work-ers or other persons, either directly or through drift. Only protected handlers may be in the area during application. For any requirements specific to your state or tribe, consult the agency responsible for pesticide regulation.
Observe all precautions and limitations in this label and the labels of products used in combination with Optill herbicide. The use of Optill not consistent with this label can result in injury to crops, animals or persons. Keep con-tainers closed to avoid spills and contamination.
Unless otherwise directed in supplemental labeling, all applicable directions, restrictions, precautions and Conditions of Sale and Warranty are to be followed.
BASF Corporation does not recommend or authorize the use of this product in manufacturing, processing or prepar-ing custom blends with other products for application in crops.
Optill herbicide provides both contact burndown and residual preemergence broadleaf and grass weed control (refer to Table 1 and Table 2 for lists of weeds controlled dependent on application rate). It can be used in Clearfield corn and specified legume vegetable crops including: chickpea (garbanzo bean), dry field peas, English peas, and soybean. Refer to Crop-specific Information section for recommendations on herbicide tank mixtures or sequential programs.
Make burndown applications of Optill when weeds are small and actively growing. An adjuvant is required with Optill for optimum burndown activity (refer to Additives section for details). Burndown activity may be slowed or reduced under cloudy and/or foggy or cooler weather con-ditions, or when weeds are growing under drought or other stress conditions. When targeting dense weed populations and/or larger broadleaf weeds, use higher spray volumes. Angling nozzles forward (to 45 degrees) may improve pen-etration of denser weed canopies.
Residual preemergence applications of Optill must be acti-vated by at least 1/2 inch of rainfall or sprinkler irrigation prior to weed seedling emergence. When Optill is not acti-vated, a labeled postemergence herbicide or cultivation may be needed to control weed escapes.
Mode of Action
Optill is a potent inhibitor of both protoporphyrinogen-oxidase, belonging to herbicide mode-of-action Group 14 (WSSA)/Group E (HRAC), and acetohydroxyacid synthase, belonging to herbicide mode-of-action Group 2 (WSSA)/Group B (HRAC). Optill is rapidly absorbed by roots and foliage. Plant death is the result of membrane damage and inhibition of the production of branched chain amino acids. Under active growing conditions, susceptible emerged weeds usually develop chlorotic and necrotic injury symptoms within hours and die within a few days. Susceptible emerging weed seedlings will usually die as they reach the soil surface or shortly after emergence.
While weed resistance to protoporphyrinogen-oxidase inhibiting herbicide is relatively infrequent, populations of resistant biotypes to protoporphyrinogen-oxidase or acetohydroxyacid-synthase inhibiting herbicides are known to exist. Resistance management practices include:
Following labeled application rate and weed growth-stage recommendations
Avoiding repeated applications of herbicides with the same mode of action
Utilizing tank mixes and sequential applications with other effective herbicides possessing different modes of action
Using crop rotation so that crop competition, tillage or herbicides with alternative modes of action can be used to control weed escapes
Crops are tolerant to Optill when applied according to label directions as a preplant to preemergence treatment and under normal environmental conditions. Crop injury may occur under stressful growing conditions (e.g. seedling disease, extreme hot or cold weather, excessive moisture, high soil pH, high soil salt concentration or drought).
Severe crop injury will result if Optill is applied postemer-gence (over the top) to any crop.
Apply Optill herbicide prior to crop emergence only.
Application Methods and Equipment
Optill may be applied by either ground or air. Thorough spray coverage is required for optimum weed control and can be improved with proper adjuvant, nozzle and spray volume selection.
Use and configure application equipment to provide an adequate spray volume, an accurate and uniform distribu-tion of spray droplets over the treated area, and to avoid spray drift to nontarget areas. Equipment should be adjust-ed to maintain continuous agitation during spraying with good mechanical or bypass agitation. Avoid overlaps that will increase rates above the use rates specified in this label. Optill may only be applied using water as the spray carrier.
Aerial Application Requirements
Water Volume. Use 3 or more gallons of water per acre.
The following measures must be followed to reduce the potential of spray drift to nontarget areas from aerial applications:
The distance of the outermost nozzles on the boom must not exceed 3/4 the length of the fixed wingspan or 90% of rotor blade diameter.
Use low-drift nozzles such as straight-stream nozzles (D-8 or larger). DO NOT use nozzles producing a mist droplet spray.
Nozzles must always point backward parallel with the airstream and never be pointed downward more than 45 degrees.
Without compromising aircraft safety, applications should be made at a height of 10 feet or less above the crop canopy or tallest plants.
DO NOT apply during periods of temperature inversions or stable atmospheric conditions.
Avoid potential adverse effects to nontarget areas by maintaining a 26-feet buffer between the point of direct application and the closest downwind edge of sensi-tive terrestrial habitats (such as grasslands, forested areas, shelter belts, woodlots, hedgerows, riparian areas, and shrub lands).
Ground Application Requirements
Water Volume. Use 5 or more gallons of water per treated acre for weed control applications. Thorough spray cover-age is required for control of emerged broadleaf weeds.
High populations and/or variations in size can prevent ade-quate spray coverage. Controlling fall-germinated weeds in the spring (e.g. horseweed/marestail) will also require thor-ough spray coverage. Use higher spray volumes (e.g. 15 to 20 gallons of water per acre) in these situations to increase spray coverage and optimize burndown activity.
The following measures must be followed to reduce the potential of spray drift to nontarget areas from ground applications:
Apply this product using nozzles which deliver medium-to-coarse spray droplets as defined by ASAE standard S-572 and as shown in nozzle manufacturer’s catalogs. Flat-fan nozzles are recommended for burn-down applications while flood-jet type nozzles are recommended for residual soil surface applications. Nozzles that deliver coarse spray droplets may be used to reduce spray drift provided spray volume peracre (GPA) is increased to maintain coverage of target (i.e. weeds or soil surface). DO NOT use nozzles that produce fine (e.g. cone) spray droplets.
Apply this product only when the potential for drift to adjacent nontarget areas is minimal (e.g. when the wind is 10 MPH or less and is blowing away from sensitive areas). DO NOT apply during periods of temperature inversions or stable atmospheric conditions.
Avoid potential adverse effects to nontarget areas by maintaining a 13-feet buffer between the application area and the closest downwind edge of sensitive terrestrial habitats (such as grasslands, forested areas, shelter belts, woodlots, hedgerows, riparian areas, and shrub lands).
Tank Mixing Information
Optill may be tank mixed with one or more registered herbicide products according to the specific tank mixing instructions in this label and respective product labels. Read and follow the applicable restrictions and limitations and directions for use on all product labels involved in tank mixing. Always follow the most restrictive label use direc-tions. Refer to Crop-specific Information section for details.
Tank mixtures with contact herbicides (e.g. carfentrazone, paraquat) may reduce the burndown activity of Optill.
Maximum seasonal use rate - Refer to the Crop-specific Information section for maximum cropping seasonal application use rates for each crop and use pat-tern. A cropping season is defined as the period following harvest of the preceding crop through the harvest of the planned or current crop.
DO NOT apply Optill herbicide after crop emergence or severe crop injury will occur.
Rainfastness - Optill is rainfast 1 hour after application. Burndown activity may be reduced if rain or irrigation occurs within 1 hour of application.
DO NOT contaminate irrigation ditches or water used for domestic purposes.
DO NOT apply Optill through any type of irrigation sys-tem (e.g. chemigation).
Full rate application of products containing chlorimuron ethyl, chloransulam-methyl, flumetsulam, imazaquin, or imazethapyr in the same year as Optill may increase the risk of injury to sensitive follow crops. Consult the respec-tive labels of these products for recommended uses of these products in combinations.
Only rotational crops harvested at maturity may be used for feed or food.
When organophosphate or carbamate insecticides are tank mixed with Optill, temporary injury may result to the treated crops.
Optill is not for sale, distribution, or use in Nassau and Suffolk counties in New York State.
Rotational Crop Restrictions, Crop Rotation,and Emergency Replanting Intervals
Use Table 3 and its exceptions in the paragraphs following the table to determine the proper interval between Optill application and rotational crop planting. This interval can be used to determine the acceptable planting interval for rota-tional crops as well as replanting after crop failure (because of environmental factors such as drought, frost or hail, etc.). Be sure to determine the rotational crop interval for tank mix products and utilize the most restrictive interval of all products applied.
Use of Optill in accordance with label directions is expect-ed to result in normal growth of rotational crops in most situations. However, various environmental and agronomic factors make it impossible to eliminate all risks associated with the use of this product and, therefore, rotational crop injury is always possible.
This section provides use directions for Optill in specific crops. Be sure to read about product information, mixing, application, weeds controlled and adjuvant instructions in preceding sections of the label. Read and follow tank mix product labels for restrictions, precautions, instructions and rotational crop restrictions.
Depending on specific crop application directions, Optill may be applied for burndown control of emerged weeds and/or residual control of germinating weeds (refer to Table 1 and Table 2 for lists of weeds controlled depen-dent on application rate) before planting (preplant/preseed) or after planting but before crop emergence. Depending on the time between Optill application and planting, a fol-lowup in-crop herbicide application may be needed for complete weed control throughout the growing season.
Thorough spray coverage is required for control of emerged broadleaf weeds. High populations and/or variations in size can prevent adequate spray coverage. Controlling fall-germinated weeds in the spring (e.g. horseweed/marestail) will also require thorough spray coverage. Use higher spray volumes (e.g. 15 to 20 gallons of water per acre) in these situations to increase spray cov-erage and optimize burndown activity.
Application Rate and Timing
Apply Optill at 2.0 ozs/A in a single application as a pre-plant burndown, preplant incorporated, or preemergence treatment in Clearfield corn (refer to Table 1 for list of weeds controlled).
Optill may be tank mixed or applied sequentially with one or more of, but not limited to, the following herbicide products:
Prowl H2O herbicide
glyphosate (e.g. Roundup herbicide)
|Registered for cultures