Thakur, Dr. B.S.Kaushik, Dushyant Kumar2016-02-102016-02-102009http://krishikosh.egranth.ac.in/handle/1/64260Investigation on "Relative preference of different mango varieties by major insect pests with special reference to mango hopper and its management through new insecticide molecules" were conducted at the Indira Gandhi Krishi Vishwavidyalaya, Horticulhlre Research Farm and in the laboratory of Department of Entomology, College of Agriculture, Raipur during 2006-07 and 2007-08. Incidence and insect pest succession on mango were studied in Raipur Chhattisgarh. Fifteen insect were observed infesting on mango orchard. Mango hoppers, Amritodus atkinsoni Lethieny and Idioscopus clypeulis Lethieny. Colonized the crop both during flushing, flowering and fiuiting stages (January to June and September to December). However high incidence in flowering stage (March to April). The incidence of scale insect, Aspidiow desfructor appeared throughout the year but were more prominent during flowering to fruiting period (March to June) of the incidence of mealy bug Rashococcus iceiyoides was appeared in vegetative stage (March) of the crop and it was seen to be high in synchrony with that of the flowering stage of the crop. However, the activity of these insect pest declined and disappeared subsequently with the remaining vegetative stage (July to November). The incidence of leaf gall Proconturii~iam atteiana also appeared throughout the year but were more prominent during vegetative and hit mattuity period (September and April) of the COT. The activity of leaf eating looper, Thalassodes quadraria; leaf eating caterpillar, Euthalia garuda; leaf webber, orthuga minacea; grey weevil, Myllocem discolor and leaf twister weevil, Apodems tranquebancus were seen to be high in synchrony with that of the vegetative stage (September to December) of the crop. However, the activity of these insect pests declined and disappeared subsequently with the flowering stage. The incidence of Shoot borer, Penicillariu jocosahix; aphid, Toxoptera odinae; thrips, Thnps hawaiiensis; blossom webber, Etrblernnza versicolor and leaf miner, Acrocercops syngramma attained high peak leveals in synchrony with the flowering stage (January to March) of the crop. The activity of mango stone weevil, Sternochae~ mungiferae synchronized with that of hit formation and maturity period (April to July). Mango hoppers population had positive correlation with maximum temperature and negative correlation with rain fall and relative humidity.Scale insect, 222 shoot borer, stone weevil, and grey weevil had positive correlation with marimurn temperature. Leaf miner, thrips, and leaf webber had negative correlation with maximum temperature. Leaf gall midge, stone weevil, grey weevil had positive correlation while leaf miner, thrips, aphids, blossom webber and leaf eating caterpillar had negative correlation with minimum temperature. Leaf eating looper, grey weevil, and Ieaf webber had positive while most other insects had negative correlation with relative humidity. In species of natural enemies have found feeding upon different insect species among them four species of spider, black ant, red ant, praying mantid were observed throughout the year. The coccinelids, green lacewing and ichneumonid wasp were observed in January to April and the cotasia, predatory bug were observed November to January. Among the twelve mango varieties screened the least susceptible to mango hoppers (A.atkinsoni and Zdioscohls clypealis) were variety MaIIika and Sundarja followed by Totapari and Sinduri whereas, highly susceptible varieties to mango hoppers was Nileshwari followed by Kesar, Neeleshan and Arnrapali. For Euthalia garuda the least susceptible varieties was Totapari followed by Kesar, Barahmashi, Neeleshan and Nileshwari whereas highly susceptible varieties was Payari followed by Malli, Langra and Sundaja. Mango variety Sundaja was found as most preferred and Mallii was found to be lens preferred variety of mango among the tested varieties against leaf webber Orthaga exvinacea. Studies on the biology, morphometrics and developmental duration of mango hoppen A, atkiwoni under laboratory conditions indicated that incubation period and nymphal duration lasted for 5.7 days and 13.6 days, respectively. Four distinct nymphal stages were recorded, the total life cycle of mango hoppers A. atkinroni took average of 22.6 days from egg to adult stage under laboratory conditions at Raipur. Seven insecticides of different groups evaluated against mango hoppers under field conditions, revealed that the application of all the insecticides viz., Imidacloprid at 0.005 per cent concentration and Carbaryl, Endosulfan, Thiodicarb, Monocrotophos, Profenophos and Azahhtin at 0.05 per cent concentration were found to be effective against mango hoppers. Among these insecticides of Imidacloprid was the most effective one and effective to check the hoppers population upto 17 days, whereas Azadiachtin was less effective against mango hoppers.enmangoes, animal developmental stages, developmental stages, insecticides, fruits, crops, planting, seasons, biological phenomena, yieldsThesis