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Castor and camphor essential oils alter hemocyte populations and induce biochemical changes in larvae of Spodoptera littoralis (Boisduval) (Lepidoptera: Noctuidae

Journal of asia-pacific entomology v.21 no.2 , 2018년, pp.631 - 637  

Abstract Two plant essential oils; camphor and castor were tested for insecticidal and antifeedant activity against the 4th instar larvae of Spodoptera littoralis, a serious pest on cotton in Egypt. Also the impact of LC10 of both oils on some physiological parameters in larvae was studied by using leaf dipping technique. Analysis of both oils using GC–MS revealed several insecticidal and antifeedant compounds. Our results showed higher insecticidal activity and antifeedant index of camphor oil against S. littoralis. The LC50 and the antifeedant indices were 163.1, 246.8 mg/ml and 12.69, 6.62% for camphor and castor bean oil, respectively. The total hemocyte count (THC) and differential hemocyte count (DHC) were reduced significantly after 48 h of treatment compared to controls. Both oils reduced all types of hemocytes except plasmatocytes which were reduced only by castor oil. Camphor oil decreased total proteins and carbohydrates while castor oil targeted only carbohydrate content. Both oils didn't affect the amount of total lipids. Lipase, α-amylase and glucose-6-phosphate dehydrogenase (G6PD) enzyme activities were increased significantly in larvae treated with camphor oil than other treatments. These results clearly indicate that castor and camphor oils can affect the nutritional status in S. littoralis larvae, thereby changing the internal metabolic processes in the larvae which make them as potential control agents in IPM programs against S. littoralis. Highlights Castor and camphor oil induce toxic effect and antifeedant activity in the 4th larval instar of S. littoralis. Total and differential hemocyte count were affected in larvae treated with LC10 of castor and camphor oil. Lipid, carbohydrate and protein contents were affected in different ways by the action of castor and camphor oil. G6PD, amylase and lipase enzyme activities were increased in camphor oil treated larvae. Graphical abstract [DISPLAY OMISSION]


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