Abstract
Six different indigenous plants were screened for antifeedant and insecticidal activity against fourth instar larvae of Epilachna beetle, Henosepilachna vigintioctopunctata, which is a severe pest on brinjal. Among the plants screened, Achyranthes aspera showed higher activity against the selected pest. Ethyl acetate extracts of A. aspera showed higher antifeedant index and insecticidal activity against fourth instar larvae of H. vigintioctopunctata. Preliminary phytochemical analysis revealed that the presence of alkaloid and quinines in the ethyl acetate extracts indicate higher percentage of activities. Hence, it may suggest its use for controlling the vegetables insect pest, H. vigintioctopunctata.
Highlights
Applications of chemical pesticides minimize the threat from pest manifestation by rapid knock-down effect, albeit with little consideration to the quality of the crop and agro-residues
Many workers reported that the indiscriminate use of chemical pesticide over a long period has been proved to be harmful to soil microflora, animals and human life, and contributed to a number of side effects, viz. development of resistance by the insects/weeds/pests resurgence and outbreak of new pests, toxicity to non-target organism, presence of non permissible level of pesticide residues on seeds, vegetables, fruits, border alteration in dynamics of pest species population, cumulatively causing poor soil fertility and hazardous effects on environment endangering the sustainability of ecosystem [1,2]
Solvent crude extracts prepared from Achyranthes aspera using solvents of hexane, chloroform and ethyl acetate and their bioactivities were tested at different concentrations against Henosepilachna vigintioctopunctata
Summary
Applications of chemical pesticides minimize the threat from pest manifestation by rapid knock-down effect, albeit with little consideration to the quality (nutritional contents) of the crop and agro-residues. Jeyasankar et al / Advances in Entomology 2 (2014) 14-19 losses to many crops including brinjal depending on place and season for variations of prevailing environmental conditions [7,8,9] It is highly destructive at both, adult and larval stages which feed on the epidermal tissues of leaves, flowers, and fruits by scrapping the chlorophyll content and cause a big yield loss [10,11,12]. The neonate larva initially attacks the foliage of the plants and the later stage feeds whole leaf by scraping This is the serious pest of various economically important vegetable crops and the developed resistance in almost all commercially available chemical pesticides. In the present investigation, screening and evaluation of various solvent plants’ crude extracts tested against Epilachna beetle
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