Pheromone trapping models for pest control: Effects of mating patterns and immigration |
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Authors: | Hugh J Barclay |
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Institution: | (1) Canadian Forestry Service, Pacific Forest Research Centre, Environment Canada, 506 West Burnside Road, V8Z 1M5 Victoria, B.C., Canada |
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Abstract: | Summary Several models are presented which examine pest population behaviour with the release of female sex pheromones for the attraction
and annihilation of males. These models include male polygamy and female monogamy, various mating frequencies, delayed mating
of females, immigration of one or all individual types, and differential survivorship of males and females.
In all the models there are two steady states, a stable s.s. at the origin and an unstable s.s. in the positive domain for
a given value of pheromone release rate. In all the models, control relies on the reduced ability of males to fertilize virgin
females following trapping and male annihilation. As such, control is very sensitive to mating frequency, being very difficult
when males mate frequently. Control is also very difficult with the immigration of even a moderate number of fertilized females.
Control is much easier when mating is delayed, especially if survivorship is low, or with density dependent population regulation. |
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