Sequential Metamitron Herbicide Timing for Resistant Weed Control
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Solution Overview
Problem
Existing herbicide combinations often fail to achieve synergistic effects, leading to weed resistance and unsatisfactory control, with potential toxicological and environmental impacts, necessitating improved methods to enhance weed control and reduce pesticide dosage.
Innovation Solution
A method involving sequential application of metamitron in a stage from 00 to 12 on the BBCH scale, followed by an additional herbicide in a stage from 09 to 15, to control weeds in cereals, rice, or maize, ensuring metamitron is applied in a lower stage than the additional herbicide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If repeated and exclusive application of an individual active ingredient is used to control weeds, then the application process is simple, but weed resistance develops and control effectiveness decreases
Solution Approach 1:
The patent combines multiple herbicides with different modes of action into a single composition containing metamitron and at least one additional herbicide from specified chemical classes. This merging approach maintains application simplicity while preventing resistance development through multi-target inhibition, thereby resolving the contradiction between ease of operation and control effectiveness.
Solution Approach 2:
The invention creates a composite herbicide composition integrating metamitron with other herbicides from different chemical classes (carboxylic acid derivatives, phenyl ethers, triazines, etc.). This composite material provides synergistic or additive effects that enhance weed control reliability while maintaining operational simplicity through single-application delivery.
2Reliability
If combinations of herbicides are used to broaden spectrum of control and minimize doses, then the weed control effectiveness improves, but the complexity of the treatment increases
Solution Approach 1:
The patent merges multiple herbicides into a pre-formulated composition that can be applied as a single treatment. This eliminates the need for separate applications of different herbicides, reducing treatment complexity while maintaining the enhanced weed control effectiveness achieved through combination therapy.
Solution Approach 2:
The composite herbicide composition provides multi-functionality by simultaneously targeting multiple weed species and resistance mechanisms through the combined action of metamitron and additional herbicides from different chemical classes, thereby achieving broad-spectrum control through a single universal treatment solution.
3Reliability
If higher doses of herbicides are applied to overcome resistance, then the weed control effectiveness improves, but the toxicological and environmental effects increase
Solution Approach 1:
The patent combines multiple herbicides with different modes of action in a single composition, enabling the use of lower individual doses while achieving enhanced weed control through synergistic or additive effects. This approach maintains effectiveness against resistant weeds while reducing the toxicological and environmental burden compared to high-dose single-herbicide applications.
Solution Approach 2:
The invention changes the dosing parameters by distributing the total herbicidal activity across multiple active ingredients in the composition. This allows each component to be applied at optimized, lower doses while collectively achieving the desired weed control effect, thereby reducing individual chemical loads and associated environmental risks.
4Reliability
If existing herbicide combinations are used, then some weed control is achieved, but synergistic effects are rarely attained and resistance development continues
Solution Approach 1:
The patent strategically merges metamitron with herbicides from specific chemical classes that have complementary or opposing modes of action to resistant weeds. This targeted combination creates synergistic effects that enhance weed control effectiveness while reducing the total herbicide dosage required, preventing the loss of substance through optimized dosing.
Solution Approach 2:
The invention converts the harmful effect of weed resistance into a benefit by selecting additional herbicides that target alternative pathways or mechanisms. This approach transforms the resistance problem into an opportunity for enhanced control through multi-target inhibition, achieving better efficacy with reduced dosage requirements.
Data Source
AI summary
A method for controlling weeds, which comprises the application of an effective amount of a herbicide composition comprising at least metamitron in an earlier stage, to a locus where the weed is to be controlled, and the application of an effective amount of at least one additional herbicide in a late stage.