University of Khartoum

Effects Of The Aggregation Nymphal Pheromone Blend (Npb) On The Gregarious Adults Of Schistocerca Gregaria (Forskal). (Acrididae: Orthoptera)

Effects Of The Aggregation Nymphal Pheromone Blend (Npb) On The Gregarious Adults Of Schistocerca Gregaria (Forskal). (Acrididae: Orthoptera)

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Title: Effects Of The Aggregation Nymphal Pheromone Blend (Npb) On The Gregarious Adults Of Schistocerca Gregaria (Forskal). (Acrididae: Orthoptera)
Author: Fageer, Taghreed Abdel Salam
Abstract: This study was carried out to examine the effects of the nymphal pheromone blend (NPB) on some biological activities of the adults' gregarious desert locust Schistocerca gregaria. 0.01% synthetic nymphal aggregation pheromone blend + anti-oxidant were used. Two control groups were conducted, one with carrier (shell oil+ anti-oxidant), the other without any treatment. The experiments were carried out under laboratory conditions (Max temp 35.2oC, Min. 25.9oC, Rh 37 %). Fully mature adults of mixed sexes were treated to reveal if there are any differences in the insects circadian rhythm (feeding- moving- roosting), in presence of the NPB. The result shows that there is no significant difference between control and treated groups. The effect of the NPB on feeding rates was also examined. The gregarious adult insects were fed on a weighted amount of fresh millet; the consumed and assimilated dry and wet food was calculated at the end. No significant differences between treated and control groups were found. Maturation of newly moulted gregarious immature males and females was investigated by monitoring colour change, sexual activities and oviposition. Onset of pairing was significantly delayed in adults treated with NPB. Regarding colour change there was significant difference between the untreated control and oil control and between the untreated control and the pheromone treated groups. There was no significant difference between the two sexes in the oil treated and pheromone treated groups. Pre oviposition period, Fecundity and oviposition behaviour were examined. It is clear that the NPB had an effect on fecundity. Females exposed to the pheromone produced significantly few egg pods compared to the untreated control; also the oil control produced few egg pods which mean that the oil has an effect. A significantly high number of egg pods were scattered by the treated females. The NPB seemed to have no significant effect on the longevity and life span of adult males and females. Accordingly it was clear that the NPB has just affected the reproductive physiology of the gregarious desert locust Schistocerca gregaria, so the pheromone can be utilized in the control of desert locust through affecting the synchronization of maturation of adults and increasing the number of scattered egg pods.
Description: 2004
URI: http://khartoumspace.uofk.edu/handle/123456789/10635
Date: 2015-05-12


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