FIELD CORN - POSTEMERGENCE
INTEGRATED PEST MANAGEMENT
Makhteshim Agan of North America, Inc. (MANA) recommends the use of Integrated Pest Management (IPM) programs to control pests. Rule Herbicide may be used as part of an Integrated Pest Management (IPM) program which can include biological, cultural, and genetic practices aimed at preventing economic pest damage. Application of Rule Herbicide should be based on IPM principles and practices including field scouting or other detection methods, correct target pest identification, population monitoring, and treating when target pest populations reach locally determined action thresholds. Consult your state cooperative extension service, professional consultants, or other qualified authorities to determine appropriate action treatment threshold levels for treating specific pest/crop systems in your area.
When herbicides that affect the same biological site of action are used repeatedly over several years to control the same weed species in the same field, naturally occurring resistant biotypes may survive a correctly applied herbicide treatment, propagate, and become dominant in that field.
Adequate control to these resistant weed biotypes cannot be expected. If weed control is unsatisfactory, it may be necessary to re-treat the problem area using a product affecting a different site of action.
To better manage herbicide resistance through delaying the proliferation and possible dominance of herbicide-resistant weed biotypes, it may be necessary to change cultural practices within and between crop seasons such as using a combination of tillage, re-treatment, tank mix partners, and/or sequential herbicide applications that have a different site of action. Weed escapes that are allowed to go to seed will promote the spread of resistant biotypes.
It is advisable to keep accurate records of pesticides applied to individual fields to help obtain information on the spread and dispersal of resistant biotypes. Consult your agricultural dealer, consultant, applicator, and/or appropriate state agricultural extension service representative for specific alternative cultural practices or herbicide recommendations available in your area.
Naturally occurring weed biotypes that are resistant to other herbicides in the sulfonylurea chemical family such as Amber herbicide, DuPont Ally herbicide, DuPont Glean FC herbicide, DuPont Express herbicide, DuPont Harmony Extra herbicide, DuPont Finesse herbicide, or DuPont Matrix will also be resistant to Rule Herbicide since it is also a member of the sulfonylurea chemical family of herbicides.
Rule Herbicide must be used only in accordance with directions on the label or in separate published MANA directions. MANA will not be responsible for losses or damage resulting from use of this product in any manner not specifically directed by MANA.
Formulation: Rule Herbicide is a dry flowable formulation containing 25% active ingredient by weight.
It is noncorrosive to equipment, nonflammable, and nonvolatile. Continuous agitation is required to maintain the product in suspension in the spray tank. For best results, the spray tank solutions of Rule Herbicide should be maintained at pH 5 to 7. Degradation of Rule Herbicide may occur if it is used in a spray solution or with spray additives that buffer pH to below 4 or above 8.
In field corn, Rule Herbicide may be applied at 0.5 to 2 ounces product per acre for selective burndown and residual control of certain annual grass and broadleaf weeds. Rule Herbicide may be applied to Roundup Ready corn in tank mix combinations with glyphosate herbicides such as Roundup Original, Roundup WeatherMAX, or similar products to add residual control for later emerging weeds. Residual weed control is dependent on rainfall or sprinkler irrigation for herbicide activation.
Mode of Action: Rule Herbicide contains rimsulfuron which belongs to the sulfonylurea chemical family of herbicides. Herbicides in this family inhibit branched-chain amino acid synthesis in plants.
Rule Herbicide is absorbed through the roots and foliage of plants, rapidly inhibiting the growth of susceptible weeds. For preemergence weed control, rainfall or sprinkler irrigation is needed to move Rule Herbicide into the soil. Generally, weeds will not emerge from preemergence applications.
In some cases, however, susceptible weeds may germinate and emerge a few days after application, but growth then ceases and leaves become chlorotic three to five days after emergence.
Death of leaf tissue and growing point will follow in some species, while others will remain green but stunted and noncompetitive.
One to three weeks after postemergence application to weeds, leaves of susceptible plants appear chlorotic, and the growing point subsequently dies. In warm, moist conditions, the expression of herbicide symptoms is accelerated; in cold, dry conditions, expression of herbicide symptoms is delayed. Death of leaf tissue and growing point will follow in some species, while others will remain green but stunted and noncompetitive.
Best weed control is attained when Rule Herbicide is applied in vigorously growing crops that shade competitive weeds. Reduced weed control may result, however, when the crop canopy is too dense and some of the spray is intercepted by the crop and it fails to reach the weeds. In addition, reduced weed control may result where the crop canopy is not as dense due to a thin crop stand or seeding skips and there is less shade.
The herbicidal action of Rule Herbicide may be less effective on weeds stressed from adverse environmental conditions (such as extreme temperatures or moisture), abnormal soil conditions, or cultural practices. In addition, weeds hardened-off by drought stress are less susceptible to Rule Herbicide.
Postemergence weed control may be reduced if rainfall occurs soon after application. Several hours of dry weather are needed to allow Rule Herbicide to be sufficiently absorbed by weed foliage (generally Rule Herbicide is rainfast in 4 hours).
General Application Timing: The best weed control is obtained when Rule Herbicide is applied to young, actively growing weeds. The degree and duration of control may depend on (a) weed spectrum and infestation intensity, (b) weed size at application, and (c) environmental conditions at and following treatment.
For maximum preemergence activity prior to application, the bed or soil surface should be smooth and relatively free of crop and weed trash (dead weeds, decaying leaves, clippings, etc.). Leaves and trash may be removed by blowing the area to be treated or by thoroughly mixing the trash into the soil through cultivation prior to herbicide application. Cultural practices that result in redistribution or disturbance of the soil surface after treatment will decrease the herbicidal effectiveness of Rule Herbicide. Cutting water furrows or cultivations that mix untreated soil into the treated areas will also reduce the effectiveness of the herbicide treatment.
For best weed management, apply Rule Herbicide with another suitable residual herbicide registered for that crop. This is recommended for all soil types, but especially for coarse-textured soils under standard sprinklers or micro-sprinklers.
More than one banded application of Rule Herbicide may be needed to provide extended weed control.
Note: See the APPLICATION INFORMATION section below for directions on application timing of Rule Herbicide.
A timely cultivation may be necessary to control suppressed weeds, weeds that were beyond the maximum size at application, or weeds that emerge after an application of Rule Herbicide. For preemergence applications, cultivation is not recommended for 7 days after an application in order to allow Rule Herbicide to fully control treated weeds. After postemergence application of Rule Herbicide, the optimum timing for cultivation is 7 to 14 days. Cultivation up to 7 days before the postemergence application of Rule Herbicide may decrease weed control by pruning weed roots placing the weeds under stress or covering the weeds with soil and preventing coverage by Rule Herbicide.
GENERAL PRECAUTIONS AND RESTRICTIONS
- Carefully observe sprayer cleanup instructions, as spray tank residue may damage other crops.
- Thoroughly clean application equipment immediately after use of Rule Herbicide. (See the Equipment Cleanup section of the label for instructions.)
- Avoid spray drift to any adjacent crops, planned planting areas, and desirable plants, as injury may occur.
- For best results, maintain spray tank solution at pH 5 to 7.
- Preemergence use on soils containing more than 6% organic matter may not provide adequate soil residual weed control and may result in reduced weed control.
- If sprinklers are used for frost protection, delay the application of Rule Herbicide until stress from environmental conditions has passed.
- Crop injury may occur following an application of Rule Herbicide if there is a prolonged period of cold weather and/or cold weather in conjunction with wet soils caused by poor drainage or excessive use of sprinkler irrigation for frost protection.
- Crop varieties/cultivars may differ in their response to various herbicides. MANA recommends that you first consult your state experiment station, university, or extension agent as to sensitivity to any herbicide. If no information is available, limit the initial use of Rule Herbicide to a small area.
- Crops (especially crops other than pome fruit, tree nuts, stone fruit, citrus, grapes, potatoes, tomatoes, and field corn) whose roots extend into a treated area may be injured.
- If tank mixing Rule Herbicide with another herbicide, check to see if the selected companion herbicide has a ground or surface water advisory. If it does, consider the advisory when using the companion herbicide.
- Tank mixing Rule Herbicide with organophosphate insecticides in some crops may result in crop injury.
- Do not apply or drain or flush equipment containing Rule Herbicide on or near desirable trees or other plants, on areas where their roots may extend, or in locations where the chemical may be washed or moved into contact with their roots. Trees or other desirable plants whose roots extend into a treated crop use area may be injured.
- Do not contaminate any body of water including irrigation water that may be used on other crops.
- Do not apply in or on irrigation canals or ditches including their outer banks.
- Do not use on lawns, walks, driveways, tennis courts, or similar areas.
- Do not apply to frozen or snow-covered soil. Crop injury may occur from applications made to poorly drained soils.
- Do not apply by air in the state of NY.
- Do not graze or feed forage, grain, or fodder (stover) from treated areas to livestock within 30 days of Rule Herbicide application.
Note: See also the specific crop uses below for additional crop-specific precautions and restrictions for use of Rule Herbicide.
Refer in the label regarding tank mix information.
For information regarding New Tank Mixture in Field Corn refer in the supplemental label.
Apply Rule Herbicide to field corn hybrids with a relative maturity (RM) of 77 days or more, including “food grade” (yellow dent, hard endosperm), waxy and High-Oil corn. Rule Herbicide has not been tested for crop safety on all field corn hybrids of less than 77 days RM, nor all white corn hybrids nor Hi-Lysine hybrids, nor does MANA have access to all seed company data. Consequently, injury arising from the use of Rule Herbicide on these types of corn is the responsibility of the user. Consult with your seed supplier before applying Rule Herbicide to any of these corn types. Seed company publications indicate “Warning”, “Crop Response Warning”, or “Sensitive” notations for the use of some ALS herbicides on corn hybrids of 77 CRM or higher. As noted in the seed company publications, sulfonylurea herbicides such as Rule Herbicide should be used with caution on these hybrids.
Consult with your local MANA representative for any additional supplemental labeling information relative to potential corn hybrid sensitivity to Rule Herbicide.
Rule Herbicide must not be applied to field corn grown for seed, to popcorn, or to sweet corn. Do not apply preemergence to coarse-textured soils (sand, loamy sand, or sandy loam) with less than 1% organic matter, or injury may result.
The maximum amount of Rule Herbicide that may be applied is 2 ounces per acre per season (or 0.5 ounce active ingredient rimsulfuron). This includes combinations of preemergence and postemergence applications of Rule Herbicide, as well as rimsulfuron from application(s) of products such as DuPont BASIS, DuPont STEADFAST, DuPont Resolve, and DuPont Clarion herbicides. Limit preemergence rates of Rule Herbicide to a maximum of 1.25 ounces per acre if following with postemergence applications of the rimsulfuron-containing products noted above.
Allow at least 3 weeks between preemergence applications of Rule Herbicide and postemergence applications of the herbicides noted above. Be sure to make sequential applications after the corn has reached the 2-collar stage but before the corn exceeds the maximum application height listed on the respective product labels.
Broadcast Application: Use a minimum of 15 gallons of water per acre (GPA) to ensure thorough coverage of the weeds and the best performance. Use a minimum of 10 GPA for light, scattered stands of weeds. For best performance, select nozzles and pressure that deliver MEDIUM spray droplets, as indicated by ASAE Standard S572. Nozzles that deliver COARSE spray droplets may be used to reduce drift, provided spray volume is increased to maintain coverage on small weeds. For optimal product performance and minimal spray drift, adjust the spray boom to the lowest possible spray height recommended in manufacturers’ specifications. Ensure that equipment is set up to avoid applying an excessive rate directly over the rows and into the corn plant whorl. Overlaps or starting, stopping, slowing, and turning while spraying may result in crop injury.
Aerial Application: Aerial application is not permitted in the State of NY. In other states, use nozzle types and arrangements that will provide optimum spray distribution and maximum coverage at a minimum of 5 GPA. Do not apply during a temperature inversion, when winds are gusty, or when conditions favor poor coverage and/or off-target spray movement (See the SPRAY DRIFT MANAGEMENT section of the label for additional information on aerial application).
Fallow: Rule Herbicide may be used as a fallow treatment in the spring or fall when the majority of weeds have emerged and are actively growing. Apply Rule Herbicide at 1 to 2 ounces per acre.
Rule Herbicide may be tank mixed with other herbicides that are registered for use in fallow. Read and follow all instructions on the label and the labels of any tank mix partner before using any other herbicide in mixtures with Rule Herbicide. If the recommendations on the tank mix partner conflict with this Rule Herbicide label, do not use in a tank mixture with Rule Herbicide.
Postemergence to Field Corn: Rule Herbicide may be applied at 0.5 to 2 ounces per acre as a postemergence broadcast application. Application should be made to corn from emergence up to 12” tall. Do not apply to corn taller than 12” or exhibiting 6 or more leaf collars, whichever is more restrictive.
Application of Rule Herbicide made after weed emergence will provide contact control of labeled weeds as well as limited residual control of later emerging weeds. MANA recommends a use rate of 1 ounce per acre for most applications. Consult with MANA technical bulletins for additional rate recommendations.
Timing to Weeds
- Tank mixtures of Rule Herbicide with glyphosate or glufosinate herbicides may be applied after weeds emerge but before they reach the maximum size listed on the glyphosate or glufosinate herbicide labels.
- Adequate soil moisture is required for optimum activity. Residual activity will be extended if rainfall falls within 5 to 7 days after application of Rule Herbicide. If activating rainfall or sprinkler irrigation (>0.5 inch) is not received within 5 to 7 days after application, follow with a cultivation or with a sequential application of a pesticide product containing nicosulfuron, if needed for residual weed control.