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20101
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Subject: Plant Pathology × Author: Choudhary, Dinesh × End date: 2012 × Start date: 2010 × Type: Thesis × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    Evaluation of coriander genotypes for resistance to Hyadaphis coriandri Das and its management through plant oils
    (CCSHAU, 2010) Choudhary, Dinesh; Kalra, V.K.
    Three experiments viz. response of coriander aphid (Hyadaphis coriandri) on different genotypes of coriander, biology of coriander aphid on some selected genotypes and the efficacy of some edible and non-edible oils of plant origin against H. coriandri in vivo and in vitro were conducted at the Research farm, Department of Vegetable Sciences and the Laboratory, Department of Entomology, CCS Haryana Agricultural University, Hisar during ‘rabi’ season of 2008-09. The coriander aphid started appearing on the crop in the third week of February and reached to its peak in the second week of March and maximum population was observed on Gujarat Coriander-1. Among twenty genotypes screened, none was completely free from infestation. On the basis of season’s average Gujarat Coriander-1 harboured maximum population (27.72 aphids/umbel) while Hisar Bhoomit, Swathi, CS-6, Sindhu, Rcr-436, Jawahar Dhania-1, Hisar Sugandh and Hisar Anand had relatively low infestation of H. coriandri (0.73 to 1.08 aphids/umbel). Coriander aphid passed through four nymphal instars and total nymphal duration on different genotypes varied from 4.70 to 8.40 days. The mean pre-reproductive, reproductive and post reproductive period varied from 1.00 to 1.50, 5.50 to 7.50 and 1.00 to 2.70 days, respectively on different genotypes. The number of nymphs produced per mother aphid ranged from 21.00 to 49.00 in different genotypes. The female H. coriandri continued to produce nymphs up to 7-8 days and the peak nymph production was observed on 3rd to 5th day. The H. coriandri life span ranged from 13.70 to 18.10 days on different genotypes. Among eight genotypes survival (%) of 1st, 2nd, 3rd, and 4th instar nymph was observed to ranged from 89.83 % to 99.97% ,70.00 % to 99.97, 60.02 % to 99.97% and 60.02 to 89.98 % respectively Two edible oils (groundnut and sesame) and five non-edible oils (castor, karanj, neem, garlic and mahua) at a conc. of 1%, except garlic oil (0.25%) were evaluated for their bioefficacy against H. coriandri and reduction (%) in aphid population in vivo after one, three and five days after treatment was observed maximum with karanj oil (1%) and minimum with groundnut oil (1%). The reduction (%) of aphid population (in vitro) after 24h, 48h and 72 h after treatment was observed maximum with sesame oil (1%) 99.95% and minimum (20.15%) with groundnut oil (1%).