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Novel cross-stage Solitarising effect of Gregarious-phase adult desert locust (Schistocerca gregaria (Forska˚ l)) pheromone on hoppers

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dc.contributor.author Magzoub, O. Bashir
dc.contributor.author Ahmed, Hassanali
dc.date.accessioned 2017-09-13T11:03:02Z
dc.date.available 2017-09-13T11:03:02Z
dc.date.issued 2009
dc.identifier.uri http://hdl.handle.net/123456789/430
dc.identifier.uri https://www.sciencedirect.com/journal/journal-of-insect-physiology/vol/56/issue/6
dc.description.abstract Previous studies had demonstrated stage differentiation in the cohesion (aggregation) pheromone systems of the desert locust, Schistocerca gregaria. In laboratory arena, the nymphal and adult stages responded aggregatively to their own pheromone, but dispersed evenly within the arena in the presence of the other. In the present study, we explored the effects of longer-term contact of field gregarious hopper bands and laboratory crowd-reared nymphs with the major constituent of the adult pheromone.During the first few days, hoppers in treated bands became relatively hyperactive. Over the next few days, their movements became random and they stopped marching as coherent groups, they started to roost for longer periods on vegetations, and they fragmented into smaller and smaller groupings and individuals. When attacked by birds, they demonstrated subdued levels of collective defensive behaviour compared to normal hoppers, and there were clear signs of increased predation and cannibalism at the roosting sites. In cage experiments, crowd-reared nymphs treated with the pheromone component became hyperactive, showed abnormal diel patterns and reduced feeding on plants but increased cannibalism. Our observations show that the major adult pheromone constituent has a solitarising effect on gregarious hoppers. hemechanismunderlying this effect and the potential of the agent in desert locust control are discussed. en_US
dc.description.sponsorship IFAD, UNDP, SAREC and AFESD en_US
dc.publisher Elsevier en_US
dc.rights Attribution-NonCommercial-ShareAlike 3.0 United States *
dc.rights.uri http://creativecommons.org/licenses/by-nc-sa/3.0/us/ *
dc.subject Schistocerca gregaria en_US
dc.subject Adult pheromone en_US
dc.subject Phenylacetonitrile en_US
dc.subject Nymphs en_US
dc.subject Solitarisation en_US
dc.title Novel cross-stage Solitarising effect of Gregarious-phase adult desert locust (Schistocerca gregaria (Forska˚ l)) pheromone on hoppers en_US
dc.type Article en_US


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