Nehad M. El-Barkey

Benha University · Department of Entomology

There is a need to formulate new insecticides against insect-borne diseases. Silica nanoparticles (SNPs) prepared by sol–gel (A800) and sol–gel/combustion (B800) methods were tested at different concentrations of 5, 25, 50, 100, and 200 ppm after 24 and 48 h on Culex pipiens larvae. The synthesized SiO2 was characterized by using different spectros...

The present study investigated the effect of dietary changes on differential and total haemocyte counts (THCs) and midgut histopathologiocal changes of S. gregaria injected with Bacillus thuringiensis israelensis (Bti). THCs of Bti-injected adults significantly decreased in all insects fed on all experimental plants. In Bti-injected locusts, prohae...

In this study the effect of four types of plants diets (grass, sorghum, sesban and clover) on the changes in haemolymph protein and haemolymph protein profile of the adult desert locust Schistocerca gregaria (Forskal) and the susceptibility of locusts to Bacillus thuringiensis (Bt) have been investigated. The highest protein content was found in th...

Silver nanoparticles (Ag NPs) was achieved by using leaf extract of Borago officinalis plant as eco-friendly reducing and capping agent. The results obtained from ultraviolet-visible spectrophotometer, dynamic light scattering, scanning & transmission electron microscopy, energy dispersive X-ray, and fourier transformed infrared confirmed the biosy...

This study aimed at studying the effect of five volatile plant oils namely; Mentha piperita (Peppermint), Origanum marjorana (Marjoram), Plargonium graveolens (Geranium), Cymbopogon proxiomus (Lemon grass) and Ocimum basilicum (Basil), were used at different concentrations (0.625, 1.25, 2.50 and 5.00%) against the Greater wax moth, Galleria mellone...

The insecticidal activity of the essential oils peppermint, Mentha piperita L ., geranium; Pelargonium graveolens L., basil; and Ocimum basilicum L . were investigated in laboratory ag ainst early fourth instar larvae of the greater wax moth, Galleria mellonella . The tested plant oils prolonged the larval - pupal periods and reduced bo...

This study highlights the complex relationship among the type of food, the performance of the locusts and midgut proteins as well as the impact of bacterial injection on the midgut proteins of adult. Grasshopper nymphs were supplied by different types of natural vegetation (grass, sorghum, sesban and clover) according to the seasons. The desert loc...

The vira-like chitinase gene, one of the genes involved in the formation of chitin and concerned with development of insect. PCR- RFLP technique was used in the present study to compare the effect of sub-lethal doses of two IGRs, flufenoxuron (cascade) as a chitin synthesis inhibitor and tebufenozide (mimic) as a moulting hormone agonist, on this g...

This study highlights the complex relationship among the type of food, the performance of the locusts and midgut proteins as well as the impact of bacterial injection on the midgut proteins of adult. Grasshopper nymphs were supplied by different types of natural vegetation (grass, sorghum, sesban and clover) according to the seasons. The desert loc...

Objective: To evaluate the larvicidal activity of essential oils derived from two essential plants and / or gamma irradiation against early fourth instar larvae of the greater wax moth (GWM), Galleria mellonella L. was investigated. Methods: The oil of two plants were tested namely; Marjoram, Origanum majorana and Lemon Grass, Cymbopogon proximus w...

Objective: To evaluate the larvicidal activity of essential oils derived from two essential plants and / or gamma irradiation against early fourth instar larvae of the greater wax moth (GWM), Galleria mellonella L. was investigated. Methods: The oil of two plants were tested namely; Marjoram, Origanum majorana and Lemon Grass, Cymbopogon proximus w...

Entomology Journal publishes original research papers and reviews from any entomological discipline or from directly allied fields in ecology, behavioral biology, physiology, biochemistry, development, genetics, systematics, morphology, evolution, control of insects, arachnids, and general entomology. www.eajbs.eg.net Provided for non-commercial re...

The cotton leafworm, S. littoralis, is a major pest in Egypt causes severe quantitative and qualitative losses of cotton and other economic crops. This study examined the effect of chitin synthesis inhibitors, lufenuron (match 5%) on the 2nd instar larvae. The results showed that lufenuron caused not only mortality in larval stages, but also caused...

The susceptibility to IGRs, moulting hormone agonist, mimic (tebufenozide) and chitin synthesis inhibitors match (lufenuron) was studied in the 2nd and 4th larval instars of the cotton leafworm Spodoptera littoralis (Bosid). Obtained results revealed that match was the more toxic against 2nd larval instars at sub-lethal concentrations LC25 and LC50...

Initial experiments were carried out to determine the dosage mortality response of the rust-red flour beetle Tribolium castaneum to two insect growth regulators, the chitin synthesis inhibitor chlorfluazuron and the juvenile hormone analogue pyriproxyfen. The response was measured as the proportion of adults developing from individuals treated duri...

Abstract: The present investigation aim to throw light on the efficiency of the median lethal concentration (LC50 value) for the novel insecticide pyridalyl on 2nd, 4th, and 6th larval instars of cotton leafworm Spodoptera littoralis (Boisd.) under laboratory conditions .The results showed that the pyridalyl is more effective on 4th instar larvae d...

Chlorfluazuron (Atabron) is an insect growth regulator (IGR) belongs to benzoylphenyl urea for controlling the major insect pests. The present work aims to investigate the toxicological and biological effects of Chlorfluazuron on the 4th larval instar of rust red flour beetle, Tribolium castaneum at different concentrations (0.1, 0.5, 1, 5 and 10 p...

Effectiveness of commercial formulations of Bacillus thuringiensis var Kurstaki "Agerin, Dipel 2X and Dipel DF" on total protein and lipid contents were studied. Activities of detoxification and metabolic enzymes were also measured in treated and control larvae of cotton leafworm Spodoptera littoralis. Collected samples from treated larvae at inter...

Under the laboratory conditions, toxicological evaluation of two compounds, Radiant SC 12% and Hexaflumuron (IGR) EC 10% against eggs of Pectinophora gossypiella (Saund.) and biological effect of these compounds on larvae, pupae and adult emergence resulted from treated eggs was also studied. The results revealed that LC 50s were 3.15, 0.811and 0.5...

Larvicidal efficacy of a new semi-synthetic avermectin derivative Methylamine avermectin (Radical 0.5% EC) was determined against larval instars of the Egyptian cotton leafworm, Spodoptera littoralis (Biosd.) in the laboratory, field and semi field experiments. 2nd and 4th instar larvae showed greatest susceptibil ity to the Radical in the laborato...

Potato tubers were irradiated with different doses of gamma irradiation (50,100 and 200Gy), and fed by the larvae of Phthorimaea operculella (Lepidoptera : Gelechiidae), to measure the effect of larval feeding on some biochemical components of the adult stage. The data indicated that the change in larval diet (tubers) due to irradiation led to some...

The research presents a mathematical simulation of three kinds of pests and their predator for two plants: Cotton and broad bean. The study was applied in two regions in Egypt representing Upper Egypt and Delta. The study is based on similar field experimental results during the two successive years 2003-2004, 2004-2005 in Qaha station-Qalubia gove...

Radiant SC12% (Spinetoram) is a new generation of spinosyn group. Effect of this bio-insecticide against larvae of Spodoptera littoralis (Boisd) was studied to evaluate the susceptibility of 2 nd and 4 th larval instars in laboratory. The LC 50 of radiant was 0.05 and 0.03 ppm. After 24 and 48 hours, respectively for the 2 nd larval instars. Where...