University of Khartoum

Distribution Of The Desert Locust ( Schistocerca Gregaria Forskal)(Acrididae: Orthoptera)In Relation To Herbage Quality In TheRed Sea Coast Of Sudan

Distribution Of The Desert Locust ( Schistocerca Gregaria Forskal)(Acrididae: Orthoptera)In Relation To Herbage Quality In TheRed Sea Coast Of Sudan

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Title: Distribution Of The Desert Locust ( Schistocerca Gregaria Forskal)(Acrididae: Orthoptera)In Relation To Herbage Quality In TheRed Sea Coast Of Sudan
Author: Omer, Kamal Suliman Obaid
Abstract: The aim of this study was to investigate the effect of different food plants, particularly the effect of nitrogen content of the plants on the life system of the desert locust Schistocerca gregaria. The main objective is to detect the most preferred food plants so that locust surveyors (locust officers) may focus on them. The trials were carried out at Salloom area south west PortSudan. The trials included rearing of adults and hoppers in cages containing three species of plants namely. Heliotropium spp, Pennisetum spp, and Aizoon spp. The plants were distributed randomly in different combinations so as to study the effet of plant type and density on desert locust distribution at different times of the day. The effect of plant age on nitrogen content, the effect of nitrogen content of Pennisetum plants on hopper development, the preference for oviposition at different plant communities and the relationship between the nitrogen content and adult distribution at different levels of plant densities were investigated. In general adults and nymphs of solitary desert locust appear to prefer Heliotropium to either Pennisetum or Aizoon during both morning and afternoon. On the other hand, Pennisetum spp, was more attractive than Aizoon spp, this pattern was not affected by plant density because even V11 when Heliotropium plant density was decreased by 50% in comparison to the other two species still the choice was the same. The quality of food seems also to influence the choice of locusts. Heliotropium and Pennisetum contain higher % N2 content/per unit of dry matter than Aizoon. Furthermore there is clear evidence that development of nymphs (measured by weight gain) is a function of available plant nitrogen content and that young seedlings of Pennisetum which caused the highest development rate contained the highest percentage N2 content in relation to the total dry matter. Older Pennisetum plants contained relatively less % N2 per unit of dry matter. Also the sites of egg laying was mainly affected by the type of the plant. Pennisetum was the most preferred for egg laying followed by Heliotropium and Aizoon respectively.
Description: 2006
URI: http://khartoumspace.uofk.edu/handle/123456789/11124
Date: 2015-05-20


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