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Articles by M.T. Shigidi
Total Records ( 2 ) for M.T. Shigidi
  A. Suleiman Elham , M.T. Shigidi and S. M. Hussan
  Ticks and Tick-Borne Diseases (TBDs) are widespread in the Sudan causing substantial losses in terms of morbidity, mortality, reduction of production and costs of control and treatment. Control of ticks is based mainly on chemical acaricides. The present study was conducted to evaluate the use of fungi as an alternative means of controlling ticks in Sudan to overcome their known drawbacks. Amblyomma lepidum ticks were collected from El Damazin abattoir in the Blue Nile State, Central Sudan to establish laboratory colonies. Ticks developed fungal growth and subsequently died. Scopulariopsis brevicaulis was isolated from scrapings taken from the white mat that covered tick's integuments after death following incubation at 27°C, RH 85%. They were cultured on Sabouraud’s and Brain heart infusion agar. Pure fungal culture was obtained. S. brevicaulis was isolated and its identification was based on macro and microscopic characteristics. Identification of the isolate was confirmed by biotechnical laboratory in Denmark. Metabolite profiling of the fungus culture filtrate was conducted on Thin Layer chromatography. Organic compounds were detected. Pathogenicity of the spore suspension and culture filtrate of the isolated fungus to larvae, nymph and adult stages of Hyalomma anatolicum and A. lepidum was investigated. High mortality to flat larvae and biotic potential of the adult were observed. Results obtained stimulate the use of S. brevicaulis metabolites as biological control agents for controlling ticks in Sudan. The study reports the first isolation of S. brevicaulis from A. lepidum in Sudan.
  Elham A. Suleiman , M.T. Shigidi and S.M. Hassan
  In the Sudan, ticks and Tick-borne Diseases (TBDs) with subsequent costs of control and treatment are causing substantial economic loss. Control of ticks is mainly by chemical insecticides. The rising environmental hazards and problem of resistance has motivated research on biological agents as alternative methods of control. The present study aims at controlling livestock ticks using fungi for their unique mode of action besides their ability to adhere to the cuticle, to germinate and penetrate enzymatically. The study was conducted to evaluate the fungus Metarhizium anisopliae for tick control as an alternative mean to chemical acaricides. Pathogenicity of the fungus was tested on different developmental stages of the tick Hyalomma anatolicum. The fungus induced high mortality to flat immature stages. It, also, affected reproductive potential of the females. Egg laid, hatching percent, fertility and moulting percent of immature stages were significantly (p≤0.05) reduced. It was, also, shown that the fungus had ability to adhere to the cuticle and penetrate the integument of the tick. Conidia of the fungus were isolated from their internal tissues. This phenomenon is important in considering fungi as bioinsecticides. Infection of eggs laid by treated engorged female ticks, with the fungus might demonstrate suggesting transovarian transmission. The use of M. anisopliae to control ticks is discussed.
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