Hanan Hamdy Awad

Cairo University | CU · Department of Entomology

Many environmental hazards are due to chemical insecticides and enhance mosquito species' resistance. This problem is solved by using safer nanocides that reduce environmental pollution among integrated pest management (IPM) programs. Selenium nanoparticles (SeNPs) were green synthesized using Cupressus sempervirens, microwave (MW), and gamma irrad...

The cotton leaf worm, Spodoptera littoralis, is one of the most injurious agricultural pests in Egypt. In the present study, the interaction between spinosad and Bacillus thuringiensis, using different pairings, in third and fifth instar larvae was determined. Activities of α- and β-non-specific esterases and acetylcholinesterase (AChE) were also d...

Farnesol, at 0.06 × 10⁴ ppm concentration was tested against the fifth nymphal instar of Locusta migratoria induced antifeedant activity by 33.6 % and 45 % to males and females, respectively. Ultrastructural studies, using transmission electron microscopy, revealed marked pathological changes in the neurosecretory cells in brain and corpora allata...

The milkweed bug, Spilostethus pandurus, is an agricultural pest in Egypt and some other tropical and subtropical areas. The objective of the present work is to clarify some biological parameters and morphological descriptions to emphasize the future researches from the ecological view point to the physiological study, biochemical study and control...

Haematoporphyrin efficiency on Aedes caspius increased the larval mortality with the increase of haematoporphyrin formulation (HPF) concentration (1 × 103 M/l). Larval mortality increased with increase the solar simulator light irradiances (350–650 W/m2) and exposure times (45 min). Dynamics of HPF accumulation and release as a function of time fee...

The food consumption, nutritional indices and the digestive enzymes (protease, invertase, amylase, trehalase and chitinase) of Schistocerca gregaria were affected by treatment with farnesol. Treated insects oviposited fewer eggs. The total haemolymph and midgut protein significantly increased in farnesol-treated insects as compared with the control...

The 5 th nymphal instar of Schistocerca gregaria (Forskal) was treated with different doses of the entomopathagenic nematodes Heterorhabditis bacteriophora Hp 88 or Allium sativum (garlic) extract, as well as a combination of both of them. Activity of Hp 88 and garlic extract showed a significant increase in the mortality by increasing the concentr...

Azadirachtin prolonged the incubation period and reduced hatchability of desert locust eggs. Many embryos suffered morphological deformation of the compound eyes and legs and incomplete development of abdominal segments. Histologically, the brain was poorly developed, this being reflected in the compound eyes, neurosecretory cells and entire ventra...

Five types of haemocytes are observed in the fourth larval instar of the black cutworm, Agrotis ipsilon: prohaemocytes (PRs), plasmatocytes (PLs), granulocytes (GRs), spherule cells (SPs) and adipohaemocytes (ADs). Infection of A. ipsilon fourth larval instar with Bacillus thuringiensis and dimilin resulted in a reduction of the total haemocyte cou...

The phenoloxidase (PO) activity in the normal 4th instar larvae of Agrotis ipsilon reached its maximum at pH 8. and at the optimum temperature 47°C. its activity was about 1.3 times that in the control when acetone was used as an activator, while it showed sever decrease (about 15.32 % of that in the control) when EDTA was used as an inhibitor. Tre...

The enhancement of the insecticidal activity of hematoporphyrin HP by a novel formula HPF was studied. The efficiency of hematoporphyrin IX (HP) and hematoporphyrin formula (HPF) was tested at concentrations of 1 x 10-5 and 1 x 10-6 M on Culex pipiens field strains in a semi-field experiment. A significant increase of larval mortality was noted aft...

The surface ultrastructure of the third larval instar of Cephalopina titillator is examined and described by means of scanning electron microscopy (SEM). Three- dimensional SEM images show external larval characters that are not only important taxonomically but also may help to understand relationships between bot fly larvae and the host. The image...