Histological Changes in the Adult Seed Bug, Graptostethus servus (Hemiptera: Lygaeidae) Treated with the Entomopathogenic Fungus, Beauveria bassiana (Ascomycota: Hypocreales). | ||
| Egyptian Academic Journal of Biological Sciences. A, Entomology | ||
| Article 3, Volume 15, Issue 3, September 2022, Pages 15-25 PDF (560.24 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/eajbsa.2022.251638 | ||
| Authors | ||
| Maha S. Nada1; Abir A. Gad2; Ahmed Mohamed Soliman2 | ||
| 1Plant Protection Research Institute, Agriculture Research Center, Dokki, Giza, Egypt | ||
| 2Department of Applied Entomology and Zoology, Faculty of Agriculture, (El-Shatby), Alexandria University, Egypt. | ||
| Abstract | ||
| The seed bug Graptostethus servus (Fabricius) (Hemiptera: Lygaeidae) is a pest, recently recorded in Egyptian oil crops, such as sesame (Sesamum indicum), sorghum (Sorghum bicolor), cotton (Gossypium hirsutum) and sunflower (Helianthus annuus). This work is considering the impact of the native isolate of the entomopathogenic fungus Beauveria bassiana (Ascomycota: Hypocreales) against G. servus. The results revealed that G. servus is very vulnerable to B. bassiana. LC50 value was 2.9x106 spores/ml and the LT50 value was 4.16 days. The infection affected various body parts, especially the cuticle and the midgut. The application of B. bassiana on the adultʼs cuticle resulted in an apparent disturbance in the structure of the cuticle and degeneration of its different parts. These changes were observed 48 hours after treatment and increased in severity over time. The fungal infection was not limited to the cuticle, but also affected the epithelial cells of the crop and midgut, as well as the mesenteric caeca. These results highlight the insecticidal potential of the fungus B. bassiana against the pest G. servus. | ||
| Keywords | ||
| Graptostethus servus; Beauveria bassiana; midgut; cuticle; histopathology | ||
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