Pink Bollworm Mating Disruption via Phased Pheromone Release
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Solution Overview
Problem
Existing methods for controlling pink bollworms, such as sex pheromone preparations and Bt cotton, face challenges in effectively suppressing damage to flower buds and cotton balls without reducing cotton yield, particularly in areas with high early spring temperatures.
Innovation Solution
A method involving the strategic planting of cotton seedlings and the installation of sustained release pheromone preparations based on the timing of adult pink bollworm emergence, using Z,Z/Z,E-7,11-hexadecadienyl acetate as the sex pheromone substance, to disrupt mating and reduce damage to flower buds and cotton balls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sex pheromone preparations are installed before early flower buds are formed, then mating disruption effect is achieved, but workability deteriorates due to incomplete growth of cotton trees requiring workers to bend over
Solution Approach 1:
The patent applies preliminary action by installing sex pheromone preparations at the optimal timing (before adult pink bollworm emergence) to ensure mating disruption effectiveness. The sustained-release formulation ensures the pheromone is released during the critical period when adult moths emerge and seek mates, achieving reliable control while allowing flexible installation timing that improves workability.
Solution Approach 2:
The patent employs dynamics by using sustained-release pheromone preparations that dynamically adjust the release rate of the sex pheromone over time. The preparation is designed to release the pheromone gradually during the emergence period of adult pink bollworms, maintaining effective concentrations without requiring reinstallation, thus improving ease of operation while ensuring continuous mating disruption.
2Object-affected harmful factors
If Bt cotton with insecticidal microorganism gene is used, then damage to cotton balls is suppressed, but the insecticidal component is ineffective on pink bollworm larvae outside the balls
Solution Approach 1:
The patent merges two control approaches: Bt cotton for protecting cotton balls from larval damage and sex pheromone preparations for disrupting mating of adult moths and protecting flower buds. This combination creates a comprehensive control system that addresses both the ball-stage larvae (via Bt) and the adult mating/flower bud stages (via pheromones), achieving versatile protection throughout the pink bollworm lifecycle.
Solution Approach 2:
The patent segments the control strategy into distinct phases: using Bt cotton specifically for ball protection and sex pheromone preparations for adult moth control and flower bud protection. This segmentation allows each method to be optimized for its specific target stage, with Bt acting on larvae inside balls and pheromones acting on adults and early larvae outside balls, achieving comprehensive coverage without compromising either function.
3Productivity
If early flower buds are damaged by pink bollworm larvae, then cotton trees lose motivation to form balls or consume energies in growth of leaves and stems, but controlling this damage requires effective intervention before ball formation
Solution Approach 1:
The patent applies preliminary action by installing sex pheromone preparations before the emergence of adult pink bollworms and before flower bud development. This timing prevents adult moths from laying eggs on flower buds, thereby preventing larval damage to buds and the subsequent vegetation phenomenon. By acting beforehand, the method protects productivity without requiring intervention after damage has occurred.
Solution Approach 2:
The patent employs preliminary anti-action by using sex pheromones to create a mating disruption effect that prevents adult pink bollworms from successfully mating and laying eggs on flower buds. This preliminary preventive measure counteracts the potential harmful effect of egg-laying on buds, eliminating the source of larvae that would cause vegetation and reduce ball formation, thus protecting cotton yield proactively.
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
This method effectively suppresses damage to early flower buds and cotton balls, thereby increasing cotton yield and maintaining high-quality cotton production without the drawbacks of conventional methods.
Implementation Method 1
installing a sustained release pheromone preparation comprising Z,Z/Z,E-7,11-hexadecadienyl acetate, which is a sex pheromone substance of the pink bollworm, in the field during a period of from 2 days to 15 days before a predicted emergence date of the next-generation adult pink bollworm
Data Source
AI summary
Provided is a pink bollworm control method that controls pink bollworms by using a mating disruption method to disturb the mating of the pink bollworms. The method including at least: a step in which cotton seedlings are planted in a field 21-41 days after the appearance of adult pink bollworms if said adult pink bollworms are a first generation, or 1-21 days after the appearance of adult pink bollworms if said adult pink bollworms are a second or later generation; and a step in which a controlled-released sexual pheromone formulation including at least Z,Z/Z,E-7,11-hexadecadienyl acetate, which is a pink bollworm sexual pheromone substance, is placed in the field 2-15 days before the predicted adult appearance date for the next generation of adults of said pink bollworms, as derived from effective accumulated temperature, and the sexual pheromone substance in the controlled-release sexual pheromone formulation is released in the field.