Method of controlling the release of agricultural active ingredients from treated plant seeds

Abstract

A method of controlling the release rate of an agricultural active ingredient from a seed that has been treated with that active includes providing a seed that has been treated with the active ingredient, applying to the treated seed a film that includes an emulsion of a polymer in a liquid in which both the agricultural active ingredient and the polymer have low levels of solubility, and then curing the film to form a water insoluble polymer coating on the surface of the treated seed. Seeds that have been treated by this method are also provided.

Description

[0001] The present application claims the benefit of U.S. Provisional Application Ser. No. 60 / 277,503 filed Mar. 21, 2001, which is incorporated herein by reference thereto.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to methods for controlling the release of agricultural active ingredients from treated plant seeds, and more particularly to methods for controlling the release of agricultural active ingredients from treated plant seeds by the use of seed coatings. [0004] 2. Description of Related Art [0005] The development and use of pesticides has increased the yield of most agronomically important plants. Pesticides, including herbicides, insecticides, nematocides, acaracides, fungicides, bactericides, and the like, are now widely applied to soils prior to, during, or after seed planting, or are applied directly or indirectly to growing plants at various times during the growing season. [0006] Widespread use of pesticides has not...

AI Technical Summary

Benefits of technology

[0016] Among the several advantages found to be achieved by the present invention, therefore, may be noted the provision of a method of controlling the release rate of an agricultural active ingredient from a seed treated with the active ingredient, where the method is easy, fast and economical to administer; the provision of such a method that is effective in controlling the release of the active from the treated seed; the provision of such a method that can be used with a wide range of agricultural actives; and the provision of such a method that can be practiced without the inconvenience and expense of having to develop a polymer coating having certain chemical compatibility between a particular active and the polymer.

Problems solved by technology

Widespread use of pesticides has not been without problems, however, due to the wide spectrum of activity and high toxicity of some pesticides.

It was soon apparent, however, that this technique also had drawbacks, such as toxicity of the pesticide to the seed, high rates of loss of the pesticide during storage and the exposure of workers handling and planting the seed to high levels of the pesticide.

In cases where the pesticide was water soluble or easily leached from the seed, the loss of pesticide from the zone of the seed could be rapid.

Not only could this reduce the efficacy of the treatment, but could also cause unwanted release of the pesticide into the environment.

This requires additional materials and results in higher cost of seed preparation.

Another problem that has hindered the development of seed coatings that control the release of pesticides has been the requirement for coatings that are carefully tailored to provide a certain chemical relationship with the pesticide.

The development of coating formulations that meet these criteria has routinely taken significant time and effort, and the formulations are most often limited to use with one type of pesticide.

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