Pyroxasulfone Herbicide Mixtures for Broad-Spectrum Weed Control

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Solution Overview

Problem

Existing herbicides often fail to effectively control a broad spectrum of weeds due to varying chemical properties, plant species, growth stages, and environmental conditions, necessitating the use of multiple herbicides with unpredictable activity and selectivity.

Innovation Solution

A herbicidal mixture comprising pyroxasulfone and a second herbicide selected from fluorochloridone, aclonifen, diflufenican, or terbutryn, with specific weight ratios and application rates to achieve broader weed control, reduced dosage, and potential synergistic effects.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a single herbicide is applied, then the application process is simple, but the weed control spectrum is limited and efficacy is unreliable across different weed types

Engineering Contradiction:

Improveweed control spectrumVSAvoidherbicide mixture complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent combines multiple herbicides (pyroxasulfone with fluorochloridone, aclonifen, diflufenican, or terbutryn) into a single mixture formulation. This merging approach allows the herbicide mixture to control a broader spectrum of weeds including gramineous weeds, broad-leaved weeds, and resistant weed species, while maintaining application simplicity through a unified formulation that can be applied in a single operation.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The herbicide mixture is designed to perform multiple functions simultaneously: controlling diverse weed types (gramineous and broad-leaved), providing broad-spectrum efficacy, and maintaining crop safety across different crop types. The mixture's multi-functionality allows it to replace multiple single herbicide applications, expanding adaptability while managing complexity through integrated formulation.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If multiple herbicides are mixed to expand weed spectrum, then weed control effectiveness improves, but the activity and selectivity become difficult to predict

Engineering Contradiction:

Improveweed control efficacyVSAvoidpredictability of mixture activity

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent establishes specific parameter ranges for the herbicide mixture, including weight ratios of pyroxasulfone to the second herbicide (0.01:1 to 1:1) and application rates (11.25-360 g ai/ha for pyroxasulfone, 31.25-1000 g ai/ha for the second herbicide). These parameter specifications provide guidance for achieving reliable weed control efficacy while managing the complexity of predicting mixture activity through standardized formulation and application protocols.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If high dosage of a single herbicide is applied to ensure efficacy, then weed control is effective, but crop safety is compromised and resistance develops faster

Engineering Contradiction:

Improveweed control efficacyVSAvoidcrop safety and resistance

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent segments the herbicide dosage into multiple active ingredients applied in combination rather than relying on a single high-dosage herbicide. By dividing the total effective dose across multiple herbicides with different modes of action (elongation synthase inhibitor, carotenoid synthesis inhibitor, protoporphyrinogen oxidase inhibitor, PSII inhibitor), the formulation achieves reliable weed control efficacy while reducing the dosage of each individual herbicide, thereby improving crop safety and delaying resistance development.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The herbicide mixture functions as a composite material combining multiple active ingredients with complementary modes of action. This composite approach provides broad-spectrum weed control effectiveness while maintaining crop safety through the synergistic interaction of different herbicide mechanisms, reducing the likelihood of resistance compared to single herbicide high-dosage applications.

Inventive Principle:

Principle #40Composite materials

Data Source

PatentUS20260013504A1Herbicidal mixture, herbicidal composition, method, use, and kits for controlling undesirable vegetation

Publication Date: 2026.01.15 ADAMA AGAN LTD

AI summary

The present disclosure relates to a herbicidal mixture comprising pyroxasulfone and a second herbicide selected from the group consisting of fluorochloridone, aclonifen, diflufenican and terbutryn. The present disclosure also relates to an herbicidal composition comprising pyroxasulfone, chlorotoluron, mesosulfuron-methyl and at least one agricultural carrier. The present disclosure also relates to a method, an use, and kits for controlling undesirable vegetation.