| 21. | The released pheromones are received by olfactory receptors on the antennae.
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| 22. | Other Plethodons do not directly restrain the females when excreting pheromones.
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| 23. | Mating disruption works best if large areas are treated with pheromones.
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| 24. | This voluntary abstinence may be induced by stress or by pheromones.
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| 25. | Pheromones are sometimes used in these castes to assist with foraging.
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| 26. | The physiological factors regulating reproductive development and pheromone production are unknown.
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| 27. | Both releaser and primer pheromones have been demonstrated in this species.
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| 28. | These pheromones are released 2 8 hours prior to female moulting.
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| 29. | Octadecanal is used by several species of insect as a pheromone.
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| 30. | Examples of baits include meat, dung, fruit and pheromones.
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