المكافحة الاحيائية لبعض ادوار الذبابة المعدنية Chrysomya albiceps (Wiedemann,1819) (Diptera : Calliphoridae) باستخدام الفطر Metarhizium anisopliae (Metschnikoff) Sorokin والبكتريا Bacillus thuringiensis Berliner مختبريا == Biological Control of some stages of Chrysomya albiceps (Wiedemann, 1819) (Diptera : Calliphoridae) Using Metarhizium anisopliae (Metschnikoff) Sorokin and Bacillus thuringiensis Berliner Under Laboratory Conditions
Author name:
زهراء سعد نوشي
Supervisor name:
نوال صادق مهدي
General topic:
Biology
Specific topic:
Zoology - Insects
Degree:
Master
University:
University of Baghdad
Language:
Arabic
University location:
Baghdad
First pages:
24T3292 - p.pdf
Abstract:
The work involved studying effects of serial concentrations of Metarhizium anisopliae on the life stages of blow fly Chrysomya albiceps (Wiedemann,1819) (larvae, pupae, adults) were conducted under laboratory conditions.The results showed that all insects stages were sensitive to the fungus. Treating of larval food and direct spraying larvae by the concentrations 2.8×106, 2.8×107, 2.8×108 conidia/ml led to increasing accumulated mortalities percentages depending on the concentration and time. Various malformations were depected.Examination of some serial histopathological sections for some dead infected larvae under compound microscope showed adhesion of fungal conidia on insects body wall and fungal hyphae invated insects internal muscles and hemocoel.Treating of blow fly pupae by direct spraying with fungal suspension concentration mentioned above led to mortalities about 13.33, 26.67, 33.33 % respectively so that adult emergency percentages were about 86.67 - 66.67% while in the control treatment was 96.67%.Adult stage showed high sensitivity when they were directly sprayed with the above concentrations which led to mortalities of about 46.67, 56.67, 70% respectively after a week of treatment.The study also conducted to evaluate serial concentrations of commercial formulation suspension (Antrol) of Bacillus thuringiensis israelensis. As a microbial control agent against Chrysomya albiceps (blow fly) larvae and adults under laboratory conditions. The results revealed that percentages of accumulated mortalities of second instar larvae were 30 - 63.33% for the doses 100 - 2000 ppm respectively , Mortalities rate increased with increased of time, treating larval food with 1000 ppm ofbacterial suspension caused mortality rate reached 30% after two days, later reached 72.96% after 12 days. The bio assays results of treating adults food showed that mortalities percentage were 33.33 - 73.33 when their food was treated by 100 - 2000 ppm of bacterial suspension. The results indicated that B thuringiensis has a potential to be a bio control agent for Ch. albiceps.Results of treatment of food of larvae by combination of mixed concentrations of fungal suspension (2.8×106 or 2.8×107 conidia / ml) and bacterial suspension (100 or 200 ppm) and direct spraying the larvae with fungal suspension led to high and rapid mortalities more than using fungus or bacterial suspension alone .Treatment of the second instar larvae with the combination A(100 ppm + 2.8×106 conidia / ml , bacterium + fungus respectively) led to accumulated mortality percentage about 30 % after one day of treatment , this percentage raised up to 66.67 % . Combination B which was consists of concentration (200 ppm + 2.8×106 conidia / ml bacterium + fungal suspension respectively) caused larval mortality percentage about 86.67 % and the adult percentage emergency was 13.33 % , while in control treatment was 96.67 % . The combinations of fungal and bacterial suspension have a synergistic effect as indicated by the results .
