A semi-field study on the effect of novel hematoporphyrin formula on the control of Culex pipiens larvae
2008
Awad, H.H. (Cairo Univ. (Egypt). Entomology Dept.) | El-Tayeb, T.A. (Cairo Univ. (Egypt). National Inst. of Laser Enhanced Sciences) | El-Aziz, N.M.A. (Cairo Univ. (Egypt). Entomology Dept.) | Abdelkader, M.H. (Cairo Univ. (Egypt). National Inst. of Laser Enhanced Sciences)
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 after 5 days of application. The concentration of 1 x 10(5) M of HPF gave the same results of HP at the concentration of 1 x 10(4) M on the larval mortality after 5 days of application. Thus, a clear synergistic effect occurred due to the incorporation of sugar and other additives to the HP. Since the efficiency of HP and HPF as larvicidal substances on C. pipiens was evident. Their possible biochemical change on the body content of the larvae, carbohydrates, proteins and lipids, was also tested. However, it was found that the effect of HP and HPF on the larvae content of carbohydrates, proteins and lipids has no significant contribution to the larval mortality due to the damage of larval organelles as a result of the high oxidative stress caused by the photosensitize effect.
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