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[Effect of chemical structure on the efficiency of certain insecticides against Apis fabae]. [Arabic]
1993
El Zemaity M.S. | Hussein M.I. | Salama S.B. | Leauassi F.
[Efficiency of juvenile hormone analogue pyripoxyfen, fenocarb and their binary mixtures on whitefly, virus infestation and tomato production]. [Arabic]
1994
Zidan Z.H. | Afifi F.A. | Sobeiha A.K. | Moawad A.G. | El Malky K.
Glutathione-S-Transferase Response Towards Imidacloprid in Honeybees (Apis mellifera L.)
2024
Hussein Ali | Basma Abdel-Aty | Walaa El-Sayed | Faiza Mariy | Gamal Hegazy
Imidacloprid is a systematic neonicotinoid widely used to combat piercing-sucking insects; however, neonicotinoids, despite having low effects on vertebrates, showed high adverse effects on honeybees (Apis mellifera L.). Glutathione-S-transferases (GST) are an important constituent of the defense system in detoxifying invading chemicals. This work examines the effects of imidacloprid on GST activity in vivo and in vitro conditions. Results revealed that there are two responses of GST activity toward IMI treatment; first, stimulation of enzyme activity to combat and detoxify the insecticide. Second, direct inhibition of GST, which is confirmed by the in vitro inhibition with IC50 887.42 ppm. At a short exposure time to IMI (2 hours) at an IMI concentration of 0.35 ppm, the enzyme was stimulated up to 113% while increasing exposure time or IMI concentration, the inhibition effect dominates.
Показать больше [+] Меньше [-]DISSIPATION OF MALATHION IN DILL AND CORIANDER PLANTS AND THEIR OILS
2005
Abd El-Rahman Mohamed M.T. | Zaki MayssounY. | Hamouda Laila S.
The insecticide malathion (57% E.C.) was applied at the rate of 712.5 gm active ingredient per feddan on dill, Anethum graveolens L. and coriander, Corianderum sativum L. for controlling aphids infesting these plants. An analytical method, using gas chromatography equipped with flame photometric detector was used for detecting the insecticide residues. A field trial was conducted to determine the rate of dissipation of malathion in dill and coriander plants and in the resulting oil. Residue analysis showed that the initial deposits determined one hour after application were 35.81 & 22.7 ppm in dill and coriander plants, respectively. Rates of dissipation of malathion were 4.72, 51.1, 68.39, 88.41 and 93.49% in dill plants and were 13.61, 43.22, 66.78, 86.26 and 91.85% in coriander plants at 1, 3, 7, 14 and 21 days post treatment, respectively. The pesticide was decayed quite rapidly in and on dill and coriander plants and detectable residues (1.62 and 0.93 ppm) were observed in these plants 28 days after treatment. At harvest 46 days for coriander and 70 days for dill after application malathion was found at average levels of 0.78 mg/kg and 0.54 mg/kg in dill and coriander dry seed, respectively. The volatile oil extracted from the seed by steam distillation process was contaminated with the insecticide at a higher levels than in the seed [about sevenfold in dill oil, 5.21 mg/kg and ninteenfold in coriander oil 10.16 mg/kg]. This means that malathion had tendency to co-distill with the dill and coriander oil throughout steam distillation process.
Показать больше [+] Меньше [-]fficiency of certain insecticides for controlling Batarachedra amydraula Mey and their effects on dates
2001
Al-Mhemid, A. (Al-Baath Univ. (Syria). Faculty of Agriculture)
[Effect of chemical structure on the efficiency of certain insecticides against Apis fabae]
1993
El-Zemaity, M.S. | Hussein, M.I. (Ain-Shams Univ., Cairo (Egypt). Faculty of Agriculture) | Salama, S.B. | Leauassi, F.
Molluscicidal and physiological activities of certain pesticides against Biomphalaria alexandrina snails
2002
El-Nahas, H.A. | El-Deeb, F.A. (Ministry of Health, Giza (Egypt). Theodor Bilharz Research Inst.)
Field evaluation of Imidacloprid applied as seed treatment to control Thrips tabaci lind on cotton with regard to soil pollution
1999
El-Hamadi, S.E.E. (Tanta Univ., Kafr-El-Sheikh (Egypt). Faculty of Agriculture) | Abou-Sholoa, M.K.A.