The Potency Of Ricinine Biopesticide From Ricinus communis Leaves As An Alternative Host For Mass Rearing Process Of Tetranychus urticae And Two Predatory Phytoseiid Mites | ||||
| Egyptian Journal of Chemistry | ||||
| Article 47, Volume 65, Issue 6, June 2022, Page 535-549 PDF (1020.63 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejchem.2021.107114.4922 | ||||
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| Authors | ||||
Ahmed Ellaithy1; Amira Abdel-khalek   2; Mona Mohammed3
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| 1Plant Protection Department, National Research Centre, Dokki, Giza, Egypt. | ||||
| 2pest and plant protection, agriculture institute, national research centre, Egypt | ||||
| 3Medicinal and Aromatic Plants Research Department, National Research centre, Dokki, Giza, Egypt | ||||
| Abstract | ||||
| The aim of this investigation was to develop an easier and cheaper alternative method for the rearing of the predatory phytoseiid mites, Phytoseiulus persimilis (Athias-Henriot) and Neoseiulus californicus (McGregor), as biological control agents of Tetranychus urticae Koch under plastic tunnel conditions in the Egyptian new reclaimed area, to satisfy the need of the private sector. The castor (Ricinus communis L.) shrub was the species tested because it appears to be a less expensive to grow and more tolerant alternative host plant to the common bean, Phaseolus vulgaris L., which is usually preferred by its growing incidentally as a weed in such locations. However, such proposed host plant have got an efficient alkaloid marked by its insecticidal and insectistatic effect. The biology of both predators and their prey were studied under laboratory condition at a mean temperature of 26 °C ± 2. and 70% ±1 rel. humidity. The estimated life table parameters for P. persimilis and N. californicus when preyed on T. urticae using the green or red leaves of the 2 castor cultivars were only slightly below the reproductive rate when T. urticae was reared on beans. Therefore, the utilization of both red and green castor leaves is usually recommended as a less expensive alternative than the common bean for the mass rearing of both of the phytoseiids predators, P. persimilis and N. californicus, on T. urticae. The total alkaloid ricinine amounted in the leaf crude extract powder 88 and 66 mg /g in red and green leaves of castor bean respectively. Ricinine percentage yield in both cultivars reached 0.59% in green and 0.49% in red leaves respectively. | ||||
| Keywords | ||||
| Ricinus cummunis; land races; pytoseiid mites; life table; Tetranychus urticae; Ricinine alkaloid | ||||
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