Biorational and Ecofriendly Insecticidal Approach of Asteraceous Plant Extract against Spotted Ballworm, Earias vittella Fabricius (Lepidoptera:Noctuidae) on Okra, Abelmoschus esculentus Linn. (Moench) in Kanpur Region

Abstract

The synthetic chemical pesticides are efficiently control the insect infestation and their damage to vegetable and crop but they are causing hazardous to the human being and environment pollution. Botanical pesticides are good alternative of synthetic chemical pesticides for pest control in modern ecological technologies. Plant extractives have a number of advantages that make them preferable in modern organic agriculture. The range of these extractives are constantly expanding. A field experiment was conducted at field of farmer affiliated to biopesticide Laboratory, Department of Zoology, D.B.S.College, Kanpur to study the bio efficacy of ten asteraceous plant extractives obtained from aerial parts of Acemella paniculata Well ex DC, Cichorium intybus (L.), Chromolaena odorata Linn., Chrysanthemum cinerariifolium (trev.) Vis., Inula racemosa Hook. F., Mantisalca duriaeri Birq. Et Cavill., Rechardia tingitana (L.) Roth, Rhaponticum acaule (L.) DC, Scorzonera undulate Vahl and Tagetes minuta Linn. were prepared under the laboratory conditions and tested against okra fruit borer, Earias vittella Fabricius, which are major polyphagous pest. The collected asteraceous plant materials washed with tap water, which were dried in shade and ground to fine powder and extracted them with help of soxhlet apparatus. They treated with 0.5, 1.0 and 2.0 % concentrations with three periods (24h, 48h and 72h) applied on laboratory reared 3 rd instars larvae of E. vittella on okra field. Each treatment with three replication and three periods. Assessments has done according to number of larvae released and mean mortality percentage counts. It is observed that alcoholic extract of C. odorata registered highest mortality (78.21%) to the larvae of E. vittella, when compared to other plant extracts as: A. paniculata (73.55%), T. minuta (68.69%) R. acaule (66.76%), have registered encouraging (greater than 60% mortality) results having insecticidal properties. Consistently, remaining all these aforementioned plant extractives have revealed their insecticidal potential at various intervals.