Repellency of some sucking insects on soyabeans by sesame and mungbeans | ||
| Journal of Pest Control and Environmental Sciences | ||
| Volume 6, Issue 1, June 1998, Pages 1-16 PDF (932.81 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpces.1998.461423 | ||
| Authors | ||
| Farida A. Taman* 1; Ali A. Elsebae2 | ||
| 1Agric. Res. Center, Sabahia Experiment Station, Alexandria | ||
| 2Dept. of Crop Production and Protection, Al-Arich, Faculty of Environ. Agric. Sciences, Suez Canal Univ. | ||
| Abstract | ||
| There is ample evidence to show that the plant kingdom is a vast store-house of chemical substances manufactured and used by plants in their own defense from attack by insects. Due to the intensive application of insecticides the present work was planned to use a cheaper alternative and a much safer way to control the sucking pests, Aphis gossypii, Tetranychus urticae and Emposca lybica by growing either sesame or mungbean as plant traps within the soyabean field. The population density of A. gossypii, E. lybica and T. urticae were much lower in soyabean polyculture; soyabean-mungbean or soyabean-sesame than in soyabean monoculture during the two successive years 1995 and 1996. The least degree of infestation occurred by A. gossypii in the soyabean plants surrounded by mungbean during two successive years 1995 and 1996 (19% and 17.7%, respectively) followed by soyabean surrounded by sesame (24% and 21%, respectively) while the highest level of infestation occurred in the plots of soyabean monoculture (45% and 39%, respectively). The resistance mechanisms of sesame and mungbean were attributed to the presence of natural toxic chemical components. The plant contents of alkaloids, flavonoids, saponins and triterpenes are suggested to be responsible for repelling insects from sesame plants while flavonoids are expected to repell insects away from mungtxan. In addition, the presence of dense growths and trichomes of mungbean leaves may help plants to deter insects feeding and adult oviposition. Chemical analysis of the leaves showed low content of some nutrients in mungbean such as protein, N, Mn, Na, Fe, Zn and Pb with an increase in K, Mg, Cu, Cr, Co, Ni and Cd. The sesame leaves showed less marked content of protein, N, Mg, Mn, Zn and Cr with an increase in Na, Fe, Ni, Co, Cu, Pb and Cd. The correlation between chemical constituents and susceptibility to pest infestation of Aphis gossypii, Tetranychus urticae and Emposca lybica was investigated. | ||
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