Herbicidal Composition Merging Cinmethylin and PDS Inhibitors
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Solution Overview
Problem
Current herbicides often fail to provide effective control of undesirable vegetation, especially resistant weed biotypes, with broad spectrum activity and compatibility with crop plants, due to issues like herbicide resistance and variable application rates.
Innovation Solution
A herbicidal composition combining (±)-2-exo-(2-Methylbenzyloxy)-1-methyl-4-isopropyl-7-oxabicyclo[2.2.1]heptane with phytoene desaturase inhibitors diflufenican or picolinafen, which offers a synergistic herbicidal effect, enhancing weed control while reducing application rates and minimizing damage to crops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single herbicidally active compound is used, then the application is simple, but the spectrum of activity is limited and resistance develops quickly
Solution Approach 1:
The patent combines cinmethylin (a synthetic auxin herbicide) with PDS inhibitors (diflufenican or picolinafen) in a single composition to achieve broad-spectrum weed control. This merging of different herbicide modes of action allows simultaneous control of grass and broad-leaved weeds while delaying resistance development, resolving the contradiction between spectrum of activity and composition complexity.
2Reliability
If higher application rates are used to control resistant weeds, then weed control effectiveness increases, but crop damage increases
Solution Approach 1:
The patent changes the parameter of herbicide combination by merging cinmethylin with PDS inhibitors in specific weight ratios (0.1:9.9 to 9.9:0.1). This parameter change allows achieving reliable weed control against resistant biotypes at reduced application rates while minimizing crop damage, as the synergistic effect of the combination provides enhanced efficacy at lower doses.
3Productivity
If repeated herbicide use is applied to control weeds, then weed population decreases initially, but resistant individuals survive and reproduce leading to resistance
Solution Approach 1:
The patent creates a composite herbicide material combining cinmethylin and PDS inhibitors with different modes of action. This composite approach ensures that when weeds are exposed to the combination, susceptible individuals are controlled by both mechanisms while resistant individuals to one mechanism remain vulnerable to the other, thereby maintaining productivity while improving reliability for resistance management over repeated applications.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composition provides effective pre- and post-emergence control of weeds, including resistant biotypes, with improved crop compatibility and broad spectrum activity, achieving herbicidal effects comparable to individual compounds at reduced application rates.
Implementation Method 1
PDS-inhibiting herbicides ('PDS inhibitors') prevent the formation of carotenoids, resulting in the degradation of chlorophyll and the destruction of chloroplast membranes
Implementation Method 2
the destruction of chloroplast membranes, which is characterized by the photobleaching of green tissues
Implementation Method 3
Diflufenican is applied pre- or early post-emergence in autumn-sown wheat and barley... Picolinafen is a known cereal herbicide which is marketed either alone or in mixture with other cereal herbicides
Data Source
AI summary
The present invention relates to a herbicidal composition comprising specific phytoene desaturase inhibitors (PDS inhibitors) selected from diflufenican and picolinafen. The invention also relates to methods and uses for controlling undesirable vegetation, in particular in crops.