রবিবার, ৩১ আগস্ট, ২০১৪

Sex Pheromones:
1. The sex pheromones represent a diverse assemblage of compounds. Though most commonly released by the females they may be released by either sex.
2. Over 150 species of insects are known in which females produce sex pheromones and about 50 in which the males do so.
3. The male & female sex pheromones differ in their property & action.
4. The female sex pheromone acts at a longer range, excites males to copulate and by and large is species specific.
5.The male sex pheromone, on the other hand, acts at a short range and only lowers the female's resistance to mating.
Insect orders producing sex pheromones. Insect orders in which sex pheromones have been detected so far are Lepidoptera, Orthoptera, Dictyoptera, Diptera, Coleoptera, Hymenoptera, Hemiptera, Neuroptera and Mecoptera.

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