Vol. 7, Issue 4 (2019)
Toxicity of methanolic fruit peel and seed extracts from Citrus sinensis (L.) Osbeck against papaya mealybug, Paracoccus marginatus (Williams and Granara de Willink)
Author(s): M Gowtham, M Shanthi, S Vellaikumar and K Premalatha
Abstract: Plant extracts contained secondary metabolites, which may protect the plants from insect herbivores, pathogens and vertebrate herbivores in one or many ways. The present study was conducted with the aim of evaluating the toxic property of the Citrus sinensis (L.) Osbeck fruit peel and seed extracts on third instar nymphs of Paracoccus marginatus (Williams and Granara de Willink), at the Department of Agricultural Entomology, Agricultural College and Research Institute, Tamil Nadu Agricultural University, Madurai during August 2018 to March 2019. Probit analysis was carried out for the methanol extract from C. sinensis peels and seeds on P. marginatus. The LC50 values for the methanolic seed and peel extract from C. sinensis on P. marginatus in different methods of toxicity tests were 0.90 % and 1.06 %, respectively by leaf contamination method, 1.07 % and 1.28 %, respectively by dry film method and 0.53 % and 0.57 %, respectively by topical application method. The LT50 values for the C. sinensis methanolic seed and peel extract on P. marginatus were 38.75 hours and 44.72 hours, respectively by leaf contamination method, 40.62 hours and 45.45 hours, respectively by dry film method and 26.40 hours and 27.91 hours, respectively, by topical application method. Among the three different toxicity methods tested by using methanol extract of C. sinensis peels and seeds against P. marginatus, topical application method proved to be most effective against P. marginatus having lowest LC50 values. This study results concludes that the methanolic seed and peel extract are toxic to the nymphs of P. marginatus.
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How to cite this article:
M Gowtham, M Shanthi, S Vellaikumar, K Premalatha. Toxicity of methanolic fruit peel and seed extracts from Citrus sinensis (L.) Osbeck against papaya mealybug, Paracoccus marginatus (Williams and Granara de Willink). Int J Chem Stud 2019;7(4):804-808.
