Thumbnail Image

Chaudhary Charan Singh Haryana Agricultural University, Hisar

Chaudhary Charan Singh Haryana Agricultural University popularly known as HAU, is one of Asia's biggest agricultural universities, located at Hisar in the Indian state of Haryana. It is named after India's seventh Prime Minister, Chaudhary Charan Singh. It is a leader in agricultural research in India and contributed significantly to Green Revolution and White Revolution in India in the 1960s and 70s. It has a very large campus and has several research centres throughout the state. It won the Indian Council of Agricultural Research's Award for the Best Institute in 1997. HAU was initially a campus of Punjab Agricultural University, Ludhiana. After the formation of Haryana in 1966, it became an autonomous institution on February 2, 1970 through a Presidential Ordinance, later ratified as Haryana and Punjab Agricultural Universities Act, 1970, passed by the Lok Sabha on March 29, 1970. A. L. Fletcher, the first Vice-Chancellor of the university, was instrumental in its initial growth.

Browse

2011 - 20152
Reset filters
Subject: Entomology × Author: G. Narendra Kumar × Start date: 2009 × Type: Thesis ×
Reset filters

Search Results

Now showing 1 - 2 of 2
  • Thumbnail Image
    ThesisItemOpen Access
    Determination of population dynamics of Varroa destructor Anderson and Trueman, base level resistance to acaricides and hygienic behaviour of European honey bee, Apis mellifera Linnaeus
    (CCSHAU, 2015) G. Narendra Kumar; Chaudhary, O.P.
    Studies were conducted to determine the population dynamics of Varroa destructor, resistance to acaricides and hygienic behaviour of Apis mellifera in three apiaries of Haryana. Mean mite population per colony was maximum in August (29.8) in Hisar and June in Yamunanagar (30.0) and Karnal (26.0) apiaries and lowest in January in all the apiaries. Among three apiaries, Yamunanagar (14.6) recorded highest mite population followed by Hisar (11.6) and it was lowest in Karnal apiary (10.7). Mite detection by sticky sheet was most effective (14.7 mites/colony) followed by Pettis test method (12.9) and soapy water method (11.4) while powdered sugar method (10.1) was least effective. Colony strength had no bearing on mite population in Hisar and Karnal apiaries while in Yamunanagar, both low (16.32) and medium (15.95) strength colonies recorded significantly higher populations while high strength colonies had lower populations (2.08). Positive colony production traits were maximum in January and lowest during October in Hisar and Karnal and September in Yamunanagar. Among negative colony production traits, bald brood was highest in June in all apiaries but was lowest in November in Hisar, January in Yamunanagar and June in Karnal. Parasitic mite syndrome (PMS) was highest in August (12.7) and lowest in January (0.5) and December (0.5) in Yamunanagar. Pettis test conducted to gauge the presence of resistance in V. destructor to acaricide fluvalinate showed higher efficacy (69.17-100.00%) and never below 50 per cent, meaning susceptible populations but lower efficacy limits of 69.2% indicated impending danger of Varroa resistance. In laboratory assays, LC50 values of fluvalinate (14.701 PPM) and flumethrin (0.460 PPM) were established. Wide variations in hygienic behaviour were recorded among the colonies. It was encouraging to find 26.8 % colonies to be highly and moderately hygienic. Of the 194 colonies sampled, 9 colonies (4.6%) were HS and 43 (22.2%) MS. Majority of colonies exhibited sensitive (S) reaction (75 colonies, 38.7%) and least sensitive reaction (LS) (67 colonies, 34.5%). HS colonies recorded minimum V. destructor population (3.47 mites/colony), and was at par with MS colonies (7.85) while LS colonies recorded maximum mites (16.69) but with non-significant differences with sensitive colonies (11.37). Based on combination of hygienic behavior and CGPs, 53 colonies were selected for future breeding programme.
  • Thumbnail Image
    ThesisItemOpen Access
    Effect of some insecticides on development and survival of trichogramma chilonis ishii
    (CCSHAU, 2011) G. Narendra Kumar; Khokhar, Sucheta
    Investigations were carried out to assess the toxicity of insecticides endosulfan, imidacloprid, spinosad, triazophos, thiodicarb, novaluron and azadirachtin on various biological parameters of Trichogramma chilonis Ishii. The bioassay studies under laboratory conditions were carried out to determine the toxicity of these insecticides on parasitisation, adult emergence, adult longevity and sexratio of T. chilonis. Laboratory studies were also carried out to determine their effect on various immature stages of T. chilonis within the host eggs of Corcyra cephalonica Stainton. Studies were also carried out to assess their residual effect under laboratory and field conditions. Spinosad was found to be the most toxic in all the laboratory studies followed by triazophos. Spinosad resulted in only 17.80 per cent parasitization and 3.97 per cent adult emergence from the eggs treated before parasitization. Novaluron was found to be the safest resulting in 58.93 per cent parasitization and 89.72 per cent adult emergence from the eggs treated before parasitization. The parasitization in other insecticides ranged from 20.00 to 40.47 per cent. Spinosad was also found highly toxic to all the immature stages resulting in only 0.46, 0.66 and 0.65 per cent adult emergence from the egg, larval and pupal stages, respectively, while novaluron was found to be safe to all the immature stages resulting in 86.75, 87.84 and 87.46 per cent adult emergence from the egg, larval and pupal stages, respectively. The adult emergence in other insecticides ranged from 57.95 to 88.63 per cent from egg stage, 53.97 to 87.12 per cent from larval stage and 61.46 to 87.15 per cent from pupal stage. In residual toxicity studies under laboratory conditions only novaluron was found to be safe while all the other insecticides remained toxic even up to 15 days of preparation of film while residual toxicity studies under field conditions resulted in the recommendation of minimum waiting period of 10 days for endosulfan, imidacloprid and azadirachtin and 15 days for thiodicarb while it was more than 15 days for spinosad and triazophos. Novaluron remained safe even from the first day of the spray and hence can be safely integrated with inundative releases of the parasitoid.