Dr Divan van Greunen - Synthetic Chemist at Insect Science

Описание: Pheromone lures are used to attract, trap, monitor or manage a specific insect population. Different insects require the use of different lures as well as different traps – it is important for the farmer to ensure that the correct combination is used.

Sex-pheromones are used at two distinct levels in modern agricultural practice:
1. Monitoring: Where lures are fitted to traps designed to detect the presence and population density of a particular species. This can be of essential importance in determining the correct timing of further control measures.
2. For direct pest control applications.

Here there are two fundamentally different approaches:
1. Mating disruption, in which the aim is to apply such high dose rates of pheromone to the crop that the natural pheromone signals of female moths are smothered in a cloud of the artificial pheromone. This prevents the male from finding the female, disrupts mating and leads to population decline.
2. Attraction, in which the pheromone is released at precisely determined dose rates to draw male pests a) to traps where they are captured in high numbers (mass trapping); b) to traps containing a small amount of insecticide that kills on contact (attract and kill); or c) to traps designed to target specific male insects, reducing their population to such an extent that mating is prevented (male annihilation technique).

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