| Abstract: | Insect pheromones, in particular sex pheromones, are becoming increasingly important in pest management. As they are both expensive to synthesise and biologically very active, efficient means of controlled release are essential if they are to be used effectively and economically in the field. Pheromone-baited traps can be used for monitoring insect pest populations and for this purpose a long-lasting attractant source with release rate closely simulating that of the insect is required. A second approach involves permeation of the atmosphere with attractant or inhibitory components of sex pheromones in order to disrupt communication between the sexes and thus reduce mating and diminish subsequent larval infestations. For this method to be effective is necessary to maintain the pheromone concentration in treatment areas at a suitably high level for several weeks. The two approaches have led to the development of different kinds of dispensing systems. To provide an attractant source in traps, pheromones have been incorporated into solid polymers, notably polythene and rubber, whilst for communication disruption, microencapsulation and ‘hollow fibre’ techniques have been developed. Recent advances are reviewed and future prospects discussed. |
