Biocontrol of Ticks (Acari: Ixodidae) by Scopulariopsis brevicaulis and Metarhizium anisopliae

الموضوعات

علوم بحتة وطبيعية

الملخص

A study was conducted to evaluate the use of fungi as analternative method for tick control instead of the currently usedchemical acaricides to overcome their known drawbacks.Scopulariopsis brevicaulis was isolated from Amblyommalepidum for the first time. Pathogenicity of the fungus was tested ondifferent developmental stages of Hyalomma anatolicumanatolicum and A. lepidum in comparison with Metarhiziumanisopliae which was obtained from the International Centre ofInsect Physiology and Ecology, Kenya. Different concentrations ofspore suspensions (curative dose 2.4x107 spores/ml) of the twofungi were used. High mortality of immature stages was observed.Mortality of flat adult ticks was also reported. There was a strongpositive correlation (r= 0.99) between the concentration of thespores and mortality of flat adult ticks. Culture filtrate of S.brevicaulis was also tested. It revealed the same effect as the sporesuspension.Both fungi affected the reproductive potential offemales A. lepidum and H .a. anatolicum. Moulting percent age ofengorged larvae and hatching of eggs were significantly reduced(P<0.05). Infection of eggs was also demonstrated which suggeststransovarian transmission of the fungus. The study also showedpersistence of S. brevicaulis for 60 days on rabbit's ears. Thisfinding suggests the ability of transmission of infection to healthyticks through direct contact. Both fungi showed ability to adhere tothe cuticles and penetrate tick integuments. Conidia of both fungiXIIIwere isolated from their internal tissues. This finding is important inconsidering fungi as bioinsecticides.Gas chromatography mass spectrometry of S. brevicaulisculture filtrate recovered ketonic compounds and fatty acids whichmight be toxic to ticks. Reduction in tick haemocyctes was shownwhich reflects the effect of these metabolites on the defenseresponse of ticks.

روابط وملفات

التعريف والنوع

رقم الوثيقة

f4e424a3-2ebb-4b8d-9811-62b3d4f182fa

رقم العقد

0

نوع الوسائط

Crawler

نوع المحتوى

الرسائل العلمية

صيغة المصدر

رسائل دكتوراة

نوع الملف

pdf text

أسماء الملفات

1638318_1.pdf

بيانات النشر

ألقاب المؤلفين

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اللغة

English

المصدر والدورية

اسم المصدر

Biocontrol of Ticks (Acari: Ixodidae) by Scopulariopsis brevicaulis and Metarhizium anisopliae

المحتوى والصفحات

عدد الصفحات

0

إشراف وإعداد

الإشراف

شوقي محمد حسان, محمد طه شقيدي

الإعداد

إلهام عبدالباسط سليمان

الاقتباسات الببليوغرافية