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Prof. Mohamed Mohamed Mahmoud Azab :: Publications:

Title:
JOINT ACTION AND EFFECTiVENESS OF BLACK PEPPER SEEDS EXTRACT WITH MODIFIED ATMOSPHERES AGAINST SOME STORED PRODUCT INSECTS.
Authors: El-Lakwah, F.A. *; Abd El— Aziz, A. E. **; and El—Kashlan, LH.
Year: 2000
Keywords: Not Available
Journal: Not Available
Volume: Not Available
Issue: Not Available
Pages: Not Available
Publisher: Not Available
Local/International: Local
Paper Link: Not Available
Full paper Mohamed Mohamed Mahmoud Azab_002.jpg
Supplementary materials Not Available
Abstract:

The efficiency of petroleum ether extract of black pepper seeds (Piper nigrum (L) alone and under modified atmosphere (MA) treatments of 25%, 50% CO2 and 99.8% N2 were investigated in the laboratory at 25± 1°C and 60± 5% RH against some stored product insects namely: the rice weevil—Sitophilus oryzae (L.), lesser grain borer—Rhizopertha dominica (F.) and red flour beetle — Tribolium castaneum (Herbst.). The results showed that the efficiency of black pepper seeds extract was concentration-and time-dependent and that extract was more toxic to the adults of S. oryzae and R. dominica than T. castaneum. Results of the effectiveness of black pepper seeds extract under different modified atmospheres showed clearly that the various tested insect species were more sensitive to seeds extract under modified atmosphere than the seeds extract alone. Results of the joint toxic actions of black pepper seeds extract at 0.2 5% and 0.5% w/w concentrations under MA of 25% CO2 produced additive effects at all exposure periods for R. dominica and T. castaneum, while in case of S. oryzae the seeds extract at 0.25% exhibited potentiation effects at 2 and 3- day exposure periods and an additive effect at 5- day exposure. Also, the seeds extract at 0.5% concentration indicated potentiation effect at 2 days and this effect turned to additive effects at longer exposures of 3 and 5 days. The Co- toxicity values resulted from the seeds extract at 0.25% w/w concentration and 9 9.8% N2 showed additive effects at all exposure periods for R. dominica, while with S. oryzae and T. castaneum synergistic effects were found at short exposure periods of 2 and 3 days but at longer exposure of 5 days an additive effect was shown.

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