Effects of the alarm pheromone (e)-β-farnesene on dispersal behaviour of the pea aphid acyrthosiphon pisum
1981
WOHLERS, P.
The behaviour of Acyrthosiphon pisum when dislodged from its host differed depending on the release stimulus. Aphids dislodged by tactile stimuli from a fine brush feigned death (thanatosis) longer than those dislodged by exposure to the synthetic alarm pheromone (E)-β-farnesene or stimuli from an approaching coccinellid predator. The aphids showed two different behavioural patterns when they resumed activity. Those that had been dislodged by a coccinellid or farnesene usually exhibited longer periods of running behaviour before they started to search and climb plant models, whereas those dislodged by touch were more likely to show immediate searching behaviour. A high percentage of aphids exhibited running behaviour when the air was enriched with farnesene, but they soon changed and searched for plants. The results indicate a rapid habituation to farnesene.
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