Nematode Pheromone Extracts for More Reliable Insect Host Infection
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Solution Overview
Problem
Existing methods for enhancing the infectivity of entomopathogenic nematodes for insect control are variable in efficacy, and there is a need to improve nematode dispersal and infectivity to enhance biocontrol success.
Innovation Solution
A method involving the extraction and use of partially purified pheromones from nematode growth media, such as liquid broth or insect host cadavers, to increase the infectivity of entomopathogenic nematodes by treating them with a nematode infectivity increasing composition before application, which includes steps like alcohol extraction, centrifugation, and drying to preserve the pheromone activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If entomopathogenic nematodes are applied directly without treatment, then the application process is simple, but the infectivity and biocontrol efficacy are variable and insufficient
Solution Approach 1:
The patent applies preliminary action by treating nematodes with pheromone extracts before application to enhance their infectivity. The method involves extracting pheromones from nematode growth media or host cadavers, then mixing these extracts with nematode suspensions prior to field application. This pre-treatment prepares the nematodes to be more effective when they encounter host insects, directly addressing the reliability issue without requiring complex equipment changes.
Solution Approach 2:
The patent uses pheromone extracts as an intermediary substance to mediate between the nematodes and their environment. These extracts, containing chemical signals from nematode growth media or host cadavers, act as a bridge that enhances nematode infectivity when mixed with nematode suspensions. The intermediary pheromone extract simplifies the treatment process while significantly improving biocontrol efficacy.
2Reliability
If pheromone extracts are used to enhance nematode infectivity, then biocontrol efficacy is improved, but the extraction and preparation process becomes more complex
Solution Approach 1:
The patent applies the extraction principle by isolating pheromone compounds from complex biological sources such as nematode growth media or host cadavers. The method involves extracting chemical signals using solvents, then concentrating and preserving these extracts for later use with nematode suspensions. This extraction process obtains the essential infectivity-enhancing compounds while removing unnecessary biological material, improving biocontrol efficacy while maintaining practical manufacturability.
Solution Approach 2:
The patent uses parameter changes by altering the physical and chemical state of pheromone extracts through concentration, drying, and storage at controlled temperatures. The method transforms fresh extracts into stable, long-term storage forms that retain biological activity. These parameter changes enable the extraction process to be performed once and the product stored for extended periods, simplifying the overall manufacturing and application process while maintaining high biocontrol efficacy.
3Speed
If crude macerate of EPN-infected hosts is used to enhance dispersal, then nematode movement is improved, but the method does not sufficiently enhance infectivity
Solution Approach 1:
The patent extracts specific pheromone compounds from crude macerates to create concentrated infectivity-enhancing formulations. By isolating the active chemical signals responsible for infectivity enhancement and concentrating them, the method achieves both improved dispersal and significantly enhanced infectivity, overcoming the limitation of using crude macerates alone.
Solution Approach 2:
The patent creates composite formulations by combining pheromone extracts with nematode suspensions in optimized ratios. This composite approach integrates the dispersal-enhancing properties of pheromones with the biological activity of live nematodes, achieving synergistic effects that simultaneously improve both nematode movement and infectivity beyond what either component could achieve alone.
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 method significantly enhances the infectivity of entomopathogenic nematodes, improving their ability to invade insect hosts, thereby increasing biocontrol efficacy across different foraging strategies and pest species.
Implementation Method 1
producing an alcohol-growth medium mixture by adding an alcohol to said growth medium to achieve a final concentration of between about 10% to about 90% of said alcohol in said growth medium; centrifuging said alcohol-growth medium mixture to remove solid or insoluble matter while maintaining a supernatant from said centrifuging
Implementation Method 2
centrifuging said alcohol-growth medium mixture to remove solid or insoluble matter while maintaining a supernatant from said centrifuging
Implementation Method 3
drying the supernatant from said centrifuging to produce a dry extract
Implementation Method 4
resuspending said dry extract in an aqueous medium to produce a water-soluble pheromone extract
Implementation Method 5
centrifuging said water-soluble pheromone extract to remove water-insoluble compounds while maintaining a water soluble supernatant to produce an aqueous nematode infectivity increasing composition
Data Source
AI summary
Disclosed are methods for increasing infectivity of entomopathogenic nematodes in any target area for the purposes of insect control, said method comprising:(a) mixing an aqueous nematode infectivity increasing composition with (i) entomopathogenic nematodes to activate said entomopathogenic nematodes for increased infectivity prior to application of said entomopathogenic nematodes to said target area, or (ii) seeds to produce coated seeds, and(b) applying said entomopathogenic nematodes to said target area or planting said coated seeds in said target area;wherein said aqueous nematode infectivity increasing composition is produced by methods disclosed herein.