Plants having resistance to multiple herbicides and its use

Abstract

This invention relates to a plant, seed, variety, inbred and hybrid. More specifically, the invention relates to plant having resistance to at least two herbicides. The invention also relates to methods of producing a hybrid plant and methods of producing a plant having resistance to at least two herbicides.

Description

CROSS-REFERENCE[0001] This application is a divisional of co-pending U.S. patent application, Ser. No. 08 / 813,788 filed Mar. 7, 1997.[0002] The present invention relates to a seed, a plant, a variety, an inbred, and a hybrid which contain a level of resistance to more than one herbicide. Such plants have advantages over plants having a single gene for herbicide resistance, especially with respect to prevention of resistance development in the target weed plants.BACKGROUND OF INVENTION[0003] The features of a commercially competitive plant varieties generally include more than high yield with excellent standability. While yield is the single most critical input which affects the crop producer's profit, producers expect consistency of yield from year to year, disease resistance, other value-added traits, and-more recently-herbicide resistance. The addition of herbicide resistance has created both opportunities as well as tremendous challenges in production agriculture.[0004] Historica...

AI Technical Summary

Problems solved by technology

The addition of herbicide resistance has created both opportunities as well as tremendous challenges in production agriculture.

Non-selective herbicides kill or inhibit the growth of all actively growing plant material.

Nevertheless, while several classes of herbicides possess a broad spectrum of efficacy, many of the herbicides lack selectivity and severely injure or kill crop plants at the application rates required for effective weed control.

While chlorimuron and thifensulfuron are registered for use in non-STS soybeans, they can cause significant crop injury, especially if applied post-emergence as described in Fielding and Stoller, Weed Technol.

; soil pH and climatic conditions (i.e. temperature and humidity) when applications are made; and injury from prior applications of chemicals (e.g. insecticides and other herbicides).

When these herbicides are combined, either intentionally or unintentionally, positive and negative interactions can result.

On the other hand, thifensulfuron interacts synergistically with imazethapyr (the active ingredient in the herbicide Pursuit) at normal use rates to severely injure non-STS soybeans; this combination causes less injury to STS soybeans but injury can exceed 20% which is commercially unacceptable and is discussed in Simpson and Stoller, Weed Technol.

This is because ALS inhibitor herbicides have become extremely important new tools in agricultural production, and any development which might limit their utility is regarded as serious.

However, in order to minimize the need for remedial measure after resistance develops, more complex strategies for weed control are required in order to delay or prevent the evolution of resistance.

Unfortunately economic and / or governmental regulations often limit the implementation of these strategies.

Images