University of Khartoum

Effect of the Desert Locust Schistocerca gregaria (Forskäl) Gregarious Adult Pheromone Phenylacetonitrile (PAN) on the Diel Rhythm of Locusta migratoria migratorioides (R, F)

Effect of the Desert Locust Schistocerca gregaria (Forskäl) Gregarious Adult Pheromone Phenylacetonitrile (PAN) on the Diel Rhythm of Locusta migratoria migratorioides (R, F)

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Title: Effect of the Desert Locust Schistocerca gregaria (Forskäl) Gregarious Adult Pheromone Phenylacetonitrile (PAN) on the Diel Rhythm of Locusta migratoria migratorioides (R, F)
Author: Yassin, Sawsan Ahmed Mohammed
Abstract: The objective of the study was to evaluate the effect of the gregarious adult pheromone Phenylacetonitrile (PAN) on the dial rhythm of nymphal instars of the African migratory locust Locusta migratoria migratorioides. The laboratory experiments were conducted in the Quarantine and Biological Control Unit, of the Department of Crop Protection, Faculty of Agriculture, University of Khartoum, Shambat, during the period from the third week of May to the end of December, 2015.The experiments were carried out under laboratory conditions, normal day light and under semi-field conditions (cage-experiments). Five treatments were setup, four with PAN at four concentrations 1%, 5%, 10%, 15%, and the fifth with diesel as control, in addition to untreated control. Each treatment was replicated 3 times, each experiment lasted five days. Pearl millet Pennisetum glaucum was grown in plastic cups and dishes to feed the nymphs of African locust during the experiment. Data were recorded twice a day, at 8:00am, and at 8:00 pm, to evaluate the daily activity. The fresh food was weighed every day and the remaining food and faeces were also weighed to so as to enable computation of the food consumed and assimilated by nymphs. The recording of data continued for five days of all treatments of the experiment. The result indicated that mortality caused by PAN increased as the pheromone concentration decreased. Mortality was, 61.66%, 46.66%, 40%, 23.33%, 18.33%, 0%,in the concentrations 1%, 5%, 10%, 15%, diesel and control, respectively. The result also showed that effect of the Pheromone on feeding rates of the nymphs was not significantly different in the various concentrations compared with diesel and untreated control. The pheromone induced some deformations such as legs and wings shedding, molting failure and malformation. PAN also caused distraction and irregularity in the diel rhythm such as moving and roosting, the nymphs became hyper active and tended to continuous moving rather than feed or roost. The research recommends further investigations in the use of PAN in control tactics of other locusts.
URI: http://khartoumspace.uofk.edu/123456789/25921


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