Best Practices for XtendiMax® Herbicide with VaporGrip® Technology (Restricted USE Pesticide) for Cotton

XtendiMax® herbicide with VaporGrip® Technology is a systemic herbicide which can have up to 14 days of soil activity on certain small-seeded broadleaf weeds, including waterhemp, marestail, and Palmer pigweed, depending on rainfall and soil type. The XtendiMax with VaporGrip Technology label MUST be read and followed.* Applicators MUST attend mandatory training and receive certification prior to any applications. Per label, applicators must adhere to federal label and any state restrictions regarding application timing, record keeping, protection of sensitive crops and endangered species, and proper downwind buffer.

*Growers/applicators MUST read and follow the labels of ALL products applied to XtendFlex® cotton. XtendiMax with VaporGrip Technology and products with XtendFlex® Technology may not be approved in all states and may be subject to use restrictions in some states. 

XtendiMax with VaporGrip Technology can be used as a preplant burndown in conventional cotton east of the Rockies in geographical areas with greater than 25 inches of annual rainfall (allow a minimum of 21 days between application and cotton planting).

XtendiMax with VaporGrip Technology can be applied in-crop when Bollgard II® XtendFlex® Technology and Bollgard® 3 XtendFlex® Technology dicamba-resistant cotton products are planted. Following application of XtendiMax with VaporGrip Technology and a minimum accumulation of 1 inch of rainfall or overhead irrigation, allow a minimum of 21 days between application and cotton planting per application of 11 fl oz/acre or less. DO NOT apply XtendiMax with VaporGrip Technology in-crop to cotton products without dicamba resistance.

XtendiMax with VaporGrip Technology has specific requirements XtendiMax with VaporGrip Technology has specific requirements for approved nozzles, additives and all tank-mix partners. Some products approved for tank mixing with XtendiMax with VaporGrip Technology require the use of an approved DRA. For a complete list of approved nozzles and tank-mix products, visit

To optimize the spray pattern and herbicide delivery within the recommended parameters for XtendiMax with VaporGrip Technology, applicators need to follow the proper order of mixing herbicides and additives. Additional requirements include 15 MPH maximum ground speed, approved nozzle types, adequate spray pressure, minimum of 15 gallons per acre (GPA) delivery, and a boom height not exceeding 24 inches above the target pest or crop canopy and ensuring the entire sprayer system is properly cleaned before and after an application of XtendiMax with VaporGrip Technology.

Guidelines to help optimize herbicide delivery when applying a DRA with XtendiMax Herbicide with VaporGrip Technology:

DRA rate. When using an approved DRA for tank-mix products, as required by the XtendiMax with VaporGrip Technology label, the lowest rate allowed by the DRA label is recommended. Only use approved DRAs.

Mixing products. Using the proper order of mixing multiple products can help avoid incompatibility that may reduce product efficacy or increase drift. Start with 1/2 to 3/4 volume of water in the tank and constant agitation prior to adding a product directly to the tank or through an inductor. Add and mix each product individually. If an inductor is used, add one product to the inductor at a time and pump it into the spray tank. Rinse the inductor thoroughly after each component has been added.

Refer to the tank-mix product labels to confirm that the respective products are registered for use in the specific crop. Refer to all individual product labels, supplemental labels, and fact sheets for all products in a tank mixture. Observe all precautions and limitations on each label. Use according to the most restrictive precautionary language statements for each product in the tank mixture.

Nozzle type and pressure. Nozzle pressure can influence droplet size and spray pattern. Use the higher operating spray pressures, within the approved range for the specific nozzle, when using a DRA with a tank mixture to improve coverage (see Table 1 on page 2 and for the most up-to-date information).

Figure 1. Spray distribution pattern of water plus a DRA at the maximum psi (left) versus the minimum psi (right)
Figure 1. Spray distribution pattern of water plus a DRA at the maximum psi (left) versus the minimum psi (right)


Figure 1 shows how the spray distribution pattern is improved with higher pressure (the maximum psi) versus lower pressure (the minimum psi). Nozzle selection is one of the most important parameters for drift control. Not all DRAs are compatible with every nozzle type and pesticide/adjuvant combination. Check with the additive manufacturer to ensure that the DRA will work properly with the spray nozzle, spray pressure, and specific spray solution.

The applicator needs to consider that operating pressure readings may be different "in the cab" (prior to screens and strainers) and at the boom where the pressure should be in the recommended range. During the initial application pass, with the sprayer operating at the desired speed and pressure, verify that the boom height is appropriate for the spray pattern overlap, not exceeding 24 inches above the target pest or crop canopy, and nozzles are providing coverage of the target pests for effective control.

Application rate. The use of DRAs result in the formation of ultra-coarse droplets and higher application volumes are needed for adequate coverage. A minimum application rate of 15 GPA is required to improve coverage, especially when higher weed populations are present.

Applicators are required to consult no more than 7 days before application for a complete list of nozzles, DRAs, and other herbicides, pesticides, and additives approved for use with XtendiMax with VaporGrip Technology.