General Information


Do not remove package from container except for immediate use. Packets containing SPROUT-STOP 80 WS are water-soluble. Do not allow packet to become wet prior to adding to the spray tank. Do not handle with wet hands. Reseal container to protect remaining packets. To prepare the spray mixture, first determine the total amount of this product to be used and the volume of water necessary for proper dilution as specified under \"APPLICATION METHODS AND RATES\". Begin filling the tank with water and drop the required number of unopened packets into the water. Do not attempt to open the water-soluble packets. When the packets have completely dissolved, start hydraulic (bypass) or mechanical agitation. Do not use air agitation.

Note: Product containing boron and/or fertilizers will prevent the water-soluble packet from dissolving. Boron and/or fertilizer products must only be added after packet(s) have completely dissolved.

Limitations, Restrictions, and Exceptions

Benefits For Use on Potatoes West of the Rocky Mountains:

Volunteer Reduction: This product will reduce the number of volunteer Potatoes in the following Spring due to its ability to control sprouting.

Improvement of Grade: This product may improve the grade of Potatoes if the application is made prior to any secondary tuber growth.

Shrinkage Reduction: Application of this product at labeled rates can reduce shrinkage in storage up to 15%.


The timing of application may occur when the smallest tubers that you want to harvest are 2 to 22 ounces in weight or 2 to 22 inches in diameter. This usually occurs 11 to 12 weeks after emergence or 3 to 4 weeks after full bloom on the Russet Burbank variety. The smallest tubers that are required to reach marketable size should begin to elongate on Russet Burbank or similar varieties at the time of application. Application before this time may result in reduced tuber size and phytotoxicity. If you will be desiccating the vines, apply this product at a minimum of 2 weeks prior to vine desiccation for best sprout control and storage results. DO NOT apply to Potato plants that are under stress.


1. Ground Application: Use the higher rate when vines are hardy and in areas where the vines will stay green and robust up through the time of crop desiccation.

2. Aerial Application: Use the higher rate where the vines will stay green and robust up through the time of crop desiccation.

Note: Applications should be made at a height greater than 10 feet above the top of the target plants unless a greater height is required for aircraft safety. Making applications at the lowest height that is safe reduces exposure of droplets to evaporation and wind.

APPLICATION NOTES (For All Applications):

Always read and follow dosage recommendations carefully and spray fields uniformly.

Uneven applications may result in \"elephant hide\" and/or bud end cracking of the Potato tubers.

To obtain the desired results, the plants/crop should not be stressed from either too much or too little water before or after application.

Do not apply to Potato plants grown for seed.

Rain or overhead irrigation occurring within 24 hours after application may reduce effectiveness. Spray Onions or Potatoes at least 24 hours before rain or overhead irrigation.

A minimum of 2 weeks should be allowed between the use of this product on Potatoes and the use of a vine desiccant.

This product is non-volatile, but regardless, no drift should be permitted onto nearby crops. Special care should be taken to prevent drift when aerial applications are made.

This product should be applied at temperatures below 85°F or at temperatures of 80°F if expected to exceed 85°F later that same day. This product is water-soluble and under high temperatures and low humidity conditions it will crystallize on the leaf surface preventing normal absorption into the plant.

Spray adjuvants are not recommended for application of this product on Potatoes. For spray adjuvant use with Onions, see that specific section.

Although this product is compatible with most commonly used fungicicides and insecticides, separate applications are recommended.

Occasionally, injury to the terminal growth of Potato foliage has been observed following application of this product according to label recommendations. Trials and usage have indicated that this injury does not adversely affect the yield or quality of the Potato tubers at harvest.

This product is not corrosive to spray equipment.

Rinse spray equipment with water after application. Do not contaminate water by cleaning of equipment or disposal of waste.

Restricted Entry Interval

12 hours