~ 1800 ~ Journal of Entomology and Zoology Studies 2020; 8(2): 1800-1805 E-ISSN: 2320-7078 P-ISSN: 2349-6800 www.entomoljournal.com JEZS 2020; 8(2): 1800-1805 © 2020 JEZS Received: 20-01-2020 Accepted: 22-02-2020 Minakshee K Landge Vrunda S Thakare, Post Graduate Institute, Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola, Maharashtra, India GK Lande Assistant. Prof. Post Graduate Institute, Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola, Maharashtra, India Vrunda S Thakare Ph.D. Scholar, Post Graduate Institute, Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola, Maharashtra, India Corresponding Author: GK Lande Assistant. Prof. Post Graduate Institute, Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola, Maharashtra, India Per cent Incidence and study of various life stages of Helicoverpa armigera on chickpea Minakshee K Landge, GK Lande and Vrunda S Thakare Abstract The Present study revealed that the incidence of eggs, I st to III rd instar larvae, IV th and V th instar larva, pre-pupal larva of H. armigera was observed from 49 th MW to 4 th MW, 48 th to 4 th MW, 49 th to 4 th MW, 49 th MW to 3 rd MW respectively. While studying the various life stages, parasitoids viz., Eriborus spp. and Campoletis chlorideae, NPV and other reasons were found the most effective mortality factors. The overall mortality in I st to III rd , IV th to V th instar larvae, pre-pupal larva, and pupa was 30.77 and 31.37 15.49, and 31.67 per cent respectively due to different reasons viz., unknown, incomplete pupation and HaNPV, pupal deformities (no adult emergence). The Male: Female sex ratio was 1:1.35. The adult emergence was 68.33 per cent and the fecundity observed was 409.64 eggs/female. Keywords: Per cent incidence, study of various, Helicoverpa armigera Introduction Chickpea (Cicer arietinum) is one of the most widely cultivated pulse crops in India. It is the third most important grain legume of the world [16, 15] grown in more than 50 countries. Among the biotic factors responsible for low yield of chickpea, damage due to insect pest is the major limiting factor. It suffers from damage by the pod borer Helicoverpa armigera – a major yield reducing factor. Pod borer damage varies considerably in different agroclimatic regions in India. Helicoverpa armigera is a cosmopolitan, multivoltine and highly polyphagous pest which attacks a number of crops of agricultural importance all over the world. H. armigera is highly polyphagous, cosmopolitan, devastating and worldwide distributed pest [16, 14] . It is the endemic pest which damages chickpea from 20 to 100% [18] . Yield losses due to this pest in chickpea may range from 70 to 95 per cent [10] . In favorable condition to pod borer, pod damage goes 90-95 per cent [17, 12] . A single caterpillar of this pest can damage 25-40 pods [13] . Farmers have become reluctant to cultivate chickpea due to his susceptibility to pod borer. Therefore, information on the incidence, population fluctuation, damage severity, various life stages study, natural key mortality factors is necessary for developing an IPM approach. In this context, the present work framed to know per cent incidence and key mortality factors by studying various life stages of Helicoverpa armigera on chickpea. 2. Methodology During the experiment, Chickpea variety ‘JAKI-9218’ was cultivated without the selection pressure of insecticides on field, for Study of per cent incidence of H. armigera. And further various life stages study was carried out in Toxicology laboratory of Department of Entomology Dr. PDKV, Akola during the year 2015-2016. 2.1 Sampling procedure Regular field visits were made in order to record the first incidence of H. armigera (egg stages) on chickpea. Counting of number of insects in the available stage was done with the appearance of insect on the crops. The sampling of H. armigera was carried out from the unsprayed chickpea plots from the beginning of pest incidence till incidence exist on the crop at an interval of 7 days and every time 10 randomly selected spot, each spot of one Meter Row Length (MRL) was examined for recording insect population. The absolute pest population was computed on hectare basis for preparing the life table. The samples were collected in the morning hours.