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PRODUCT INFORMATION

ZEMBUTM Herbicide is a contact herbicide formulated as a granule suitable for selective pre- and early postemergence weed control. When applied according to label directions, it is effective in the control of susceptible grass, sedge, and broadleaf weeds in water-seeded rice. ZEMBU Herbicide is formulated using dust-free inert carrier granules (dust index <0.3). To achieve optimal weed control, apply ZEMBU Herbicide to water-seeded rice prior to or at day of seeding (DOS). Apply ZEMBU Herbicide by air using fixed-wing or rotary aircraft. Calibrate equipment to ensure uniform distribution of granules. Efficacy may depend on the following parameters:

•Weed stage of growth

•Growing and environmental conditions (e.g., excess soil moisture, rain, and temperature) prior to and following treatment •Water management Pyraclonil, the active ingredient in ZEMBU Herbicide, is a Group 14 herbicide based on the mode of action classification system of the Weed Science Society of America. Pyraclonil inhibits the plant enzyme protoporphyrinogen oxidase (PPO), leading to cell membrane disruption and ultimately plant death.

WEED RESISTANCE MANAGEMENT

For resistance management, ZEMBU Herbicide is a Group 14 herbicide. Any weed population may contain or develop plants naturally resistant to ZEMBU Herbicide and other Group 14 (PPO) herbicides. The resistant biotypes may dominate the weed population if these herbicides are used repeatedly in the same field. Appropriate resistance management strategies should be followed. ZEMBU Herbicide and other pesticides should be incorporated into an Integrated Pest Management (IPM) program that can include the use of cultural, biological, and other chemical practices to prevent economical pest damage. Effective IPM practices include the use of weed-free seed, proper scouting and identification of weeds within each paddy, optimum water management, pesticide treatment at the appropriate target stage, and mechanical weed control when appropriate. This list is not inclusive and should be used in conjunction with other practices to further prevent resistance development. To delay herbicide resistance, take one or more of the following steps:

•Always apply ZEMBU Herbicide at its intended use rate of 14.9 lb formulated product per acre per year (0.268 lb pyraclonil active ingredient per acre per year).

•Avoid following a PPO-inhibiting herbicide application with another herbicide application of the same mode of action unless in tank mixture with a product with a different mode of action. •The use of PPO herbicides in consecutive years should be done in conjunction with herbicides containing other modes of action

•Monitor escaped weeds and control them before they can produce seed.

•Rotate the use of ZEMBU Herbicide or other Group 14 herbicides within a growing season sequence or among growing seasons with different herbicide groups that control the same weeds in a field.

•Use tank mixtures with herbicides from a different group if such use is permitted; where information on resistance in target weed species is available, use the less resistance-prone partner at a rate that will control the target weed(s) equally as well as the more resistance-prone partner. Consult your local extension service or certified crop advisor if you are unsure as to which active ingredient is currently less prone to resistance.

•Adopt an integrated weed management program for herbicide use that includes scouting and uses historical information related to herbicide use and crop rotation and that considers tillage (or other mechanical control methods), cultural (e.g., higher crop seeding rates; precision fertilizer application method and timing to favor the crop and not the weeds), biological (weed-competitive crops or varieties), and other management practices.

•Users should scout before and after application.

•If a weed pest population continues to progress after treatment with this product, discontinue use of this product, and switch to another management strategy or herbicide with a different mode of action, if available.

•Users should report lack of performance to registrant or their representative. Suspected herbicide-resistant weeds may be identified by these indicators:

•Failure to control a weed species normally controlled by the herbicide at the dose applied, especially if control is achieved on adjacent weeds;

•A spreading patch of noncontrolled plants of a particular weed species; and

•Surviving plants mixed with controlled individuals of the same species. Contact your local sales representative, crop advisor, or extension agent to find out if suspected resistant weeds to this MOA has been found in your region.