Evaluation of Two Fixed Oils Lepidium sativum and Trigonella foenum-graecum and the Volatile Oil Cupressus macrocarpa as Repellent Agent on Two- Spotted Spider Mite, Tetranychus urticae Koch Infesting Mulberry Trees and Its Impact on Silk Worm, Bombyx mori l.

Document Type : Original Article

Authors

Sericulture, Physiology and Acarology Research Departments, Plant Protection Research Institute, A.R.C., Dokki, Egypt

Abstract

Laboratory bioassays of the plant fixed oils, Lepidium sativum, Trigonella foenum-graecum and volatile oil, Cupressu smacrocarpa as repellent against adult females of two spotted spider mite, Tetranychus urticae Koch which infesting mulberry trees, the predominant food source for silkworm, Bombyx mori. The results indicated the oils have repellent effect that may be useful in the future to control of the phytophagous mites.
Moreover, the effect of these oils was evaluated on some biological, technological and biochemical aspects of Bombyx mori L. All investigated oils increased larval body weight, fresh cocoon weight, cocoon shell weight, silk filaments weight and decreased the mortality percentage as compared to control. Furthermore, C. macrocarpa oil at all concentrations increased cocooning percentage. In the same trend, effect of used oil on total soluble protein, aspartate transaminase and alanine transaminase enzyme levels of the haemolymph of silkworm larvae were studied. Whereas, total soluble protein content increased significantly by concentration of 1% L. sativum and C. macrocarpa, respectively. Moreover, the elevations of aspartate and alanine transaminase enzymes were noticed at the highest concentrations of the tested oils. It could be recommended that, it’s safe to use the tested oils for repellency of T. urticae which infesting mulberry trees without any dangerous effect on mulberry silkworm, Bombyx mori that feed on these trees. Also, these oils increased the productive characters of mulberry silkworm B. mori and can be used as nutritional additives to increase the silk yield.

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