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Subject: Agricultural Entomology ×

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Now showing 1 - 9 of 493
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    ThesisItemOpen Access
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    ThesisItemOpen Access
    Evaluation of Different Methods of Supplementation of Azolla pinnata to Silkworm, Bombyx mori L. on Growth and Cocoon Parameteres
    (University of Agricultural Sciences, Dharwad, 2017-06) Nandeesh J.S.; Patil, G.M.
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    ThesisItemOpen Access
    Present Status of Sugarcane Root Borer, Polyocha depressella (Swinhoe) (Lepidoptera: Pyralidae) in Northern Karnataka and its Management
    (University of Agricultural Sciences, Dharwad, 2017-06) Patil, Shobha H.; Tippannavar, P.S.
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    ThesisItemOpen Access
    Assessment of Yield Loss in Maize Due to Stem Borers and their Management
    (University of Agricultural Science, Dharwad, 2017-09) Malipatil, Arunkumar R.; Mallapur, C.P.
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    ThesisItemRestricted
    Biology and Management of Maruca vitrata (Gayer) on Groundnut
    (University of Agricultural Science, Dharwad, 2017-06) Hanabar, Lalita; Hegde, M.G.
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    ThesisItemOpen Access
    Eco-Friendly Approaches for the Sucking Pests Management in Cutflowers (Gerbera) Under Protected Cultivation
    (University of Agricultural Science, Dharwad, 2017-08) Venkatachalapathi K.N.; Patil, R.K.
    A polyhouse study on monitoring, varietal evaluation, coloured sticky traps, bio-pesticides and synthetic chemicals for the management of sucking pests in gerbera was carried out in completely randomised block design during 2016-17 at the Hi-Tech Horticulture Unit, University of Agricultural Sciences, Dharwad. During monitoring, three species of thrips (Frankliniella schultzei, Scirtothrips dorsalis and Haplothrips gowdeyi), red spider mite (Tetranychus urticae) and natural enemies (spiders and anthocorids) were recorded. The highest population of thrips and mites were recorded during May (33.05 thrips/flower and 2.95 mites/flower, respectively) and lowest population was recorded during July (19.30 thrips/flower and 1.35 mites/flower, respectively). Nine varieties were screened for thrips incidence. “Rosalin” variety with pink flower had least thrips (4.43 thrips/flower) whereas “Stanza” with red flower had highest thrips infestation (22.33 thrips/flower). Among the seven colour traps evaluated for management of thrips, yellow sticky trap was significantly superior in trapping thrips (2.84 thrips/2.5 cm2 /week) followed by blue sticky trap (1.90 thrips/2.5 cm2 /week). Among the bio-pesticides evaluated for management of thrips, highest per cent protection (89.12 % with net returns of Rs. 2,07,424 and B: C ratio of 2.29) was recorded with three sprays of Lecanicilium lecanii (OF) + Nimbicidine 0.03 per cent, followed by Profenofos 50 EC (86.91 % reduction with net returns of Rs. 1, 92,708 and B: C ratio of 2.20), L. lecanii (OF) (82.73 % with net returns of Rs. 2,01,258 and B: C ratio of 2.25) and Chlorofenpyr 10 SC (78.98 % reduction with net returns of Rs. 1,84,708 and B:C ratio of 2.14). Three sprays of L. lecanii (OF) + Nimbicidine 0.03 per cent effectively controlled thrips in gerbera under polyhouse.
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    ThesisItemOpen Access
    Studies on Nursery Raising, Pests and Culturing Eri Silkworm (Samia cynthia ricini Boisdual) on Flemigia semialata Roxb.
    (University of Agricultural Science, Dharwad, 2017-12) Nemachandra S.B.; Patil, G.M.
    Studies on nursery raising, pests and culturing eri silkworm on Flemingia semialata Roxb. were carried out at Ericulture laboratory, Department of Agricultural Entomology, UAS, Dharwad during, 2015-16. The study on nursery raising with different pre-sowing seed treatments of F. semialata revealed that seed germination parameters were higher on treating seeds with concentrated H2SO4 viz., germination, shoot length, root length, number of roots, number of leaves and seedling vigour index (75.00 %, 11.15 cm, 8.65 cm, 13.96, 9.08 and 1482 respectively) when compared to other treatments. With respect to stem cuttings, treatment with IBA @ 2000 ppm on hardwood cuttings gave significantly higher results viz. sprouting, establishment and seedling vigour index (46.67 %, 33.33 % and 1718 respectively) than other treatments. About twenty three insect-species were recorded during the study period (Jun to Feb, 2015-16) on F. semialata plants. Among the different orders observed, Lepidoptera was the dominant group comprising ten insects. Nine insects belonged to Hemiptera and one each to Coleoptera, Orthoptera, Isoptera and Diptera. Major insects causing significant damage were pigeonpea pod fly (88.65 %), mealy bug (22.28 %) and spiraling white fly (18.43 %). Culturing eri silkworm revealed that among the host plants tried for eri silkworm rearing high survival rate (97.03 %), larval weight (7.10 g), silk gland weight (0.54 g), higher shell percentage (13.87 %), ERR (96.52 %), short larval duration (19.96 days) and short life cycle (45.96 days) were observed when reared on castor. Within Flemingia treatments high survival rate (67.18 %), larval weight (4.68 g), silk gland weight (0.41 g), ERR (42.87 %), short larval duration (40.95 days) and short life cycle (66.89 days) was observed when reared on tender leaves upto 3rd instar and medium mature leaves in 4th and 5th instar.
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    ThesisItemOpen Access
    Biodiversity of Natural Enemies in Grape Ecosystem
    (University of Agricultural Science, Dharwad, 2017-07) Sujatha S.; Sunitha, N.D.
    Studies on biodiversity of natural enemies in grape ecosystem were undertaken during 2016-17. The experiment was conducted in three locations namely Vijayapur (Study area-1), Aliyabad (Study area-2) and Tikota (Study area-3) of Vijayapur district, Karnataka (India). Assessment of different methods of natural enemy collection and to study the effect of herbivore induced plant volatile on biodiversity of natural enemies and the identification of insect predators and parasitoids of major grape pests were carried out. Natural enemies were collected through three methods viz., Herbivore induced plant volatile (Methyl salicylate 99-100% , Lobal chemie), Yellow sticky trap (YST) and Sweep net (SN). Collection method through Herbivore induced plant volatile (HIPV) was found significantly superior and on par with yellow sticky trap method. The abundance of natural enemies was highest by HIPV (43.00 %) followed by yellow sticky trap (35.00 %) and lowest in sweep net (22.00 %) method of collection. The highest abundance was recorded for coccinellids (37.00 %) and lowest abundance was recorded for ichneumonids (11.00 %). Among the natural enemies collected, predators constituted 89.00 per cent and parasitoids 11.00 per cent. Studies on input usage pattern in the study areas revealed different levels of pesticide pressure and also the variations in pest load, land use practices and pest management practices and weather conditions. Keeping this in view diversity indices were calculated. The Simpson diversity index values were 0.76, 0.79 and 0.81, Shannon index values were 1.68, 1.70 and 1.73 and Evenness values were 0.96, 0.93 and 0.87 for study area -1, 2 and 3 respectively. There were seven families of natural enemies from five orders in three study areas viz., Coccinellidae (Coleoptera), Syrphidae (Diptera) Icneumonidae (Hymenoptera), Pentatomidae and Miridae (Hemiptera), Chrysopidae and Hemerobidae (Neuroptera).
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    ThesisItemOpen Access
    Studies on Natural Enemies and Management of Citrus Leaf Miner, Phyllocnistis citrella Stainton (Lepidoptera: Gracillaridae)
    (University of Agricultural Science, Dharwad, 2017-07) Kattebennuru, Basavaraj; Biradar, A.P.
    An experiment entitled “Studies on natural enemies and management of citrus leaf miner, Phyllocnistis citrella Stainton (Lepidoptera: Gracillaridae)” was conducted in farmers field at Ukkali of Vijayapur district. A survey for natural enemies of the citrus leaf miner in citrus ecosystem was carried out in Vijayapura district of Karnataka during 2016-17. During the survey parasitisation of citrus leaf miner by Citrostichus sp. (Hymenoptera: Eulophidae) was noticed. Six generas of predaceous spiders viz., Neoscona nautica (Araneidae), Neoscona sp. (Araneidae), Bianor sp. (Salticidae), Peucetia sp. (Oxyopidae), Stegodhyphus sp. (Eresidae) and Oxyopes sp. (Oxyopidae), one species of Coccinellid, Chilomenes sexmaculata and green lacewing, Chrysoperla zastrowi sillemi were noticed. The genus Citrostichus parasitoids were solitary, most common and parasitized the second and third larval stages of citrus leaf miner. Predaceous spiders out numbered the coccinellids and green lacewing in lime orchard. Investigation on managing the citrus leaf miner were conducted with ten treatments of organics and twelve treatments of insecticides on citrus leaf miner. Among the foliar sprays of organics, neem seed kernel extract 5 per cent + biodigester solution 3 per cent (2.52 live mines per 10 cm shoot) recorded least number of live mines per shoot, which was on par with biodigester solution 3 per cent (2.42 live mines per 10 cm shoot) treatment. Among the inorganics, thiamethoxam 25 WG @ 0.2 g/l (3.52 live mines per 10 cm shoot) recorded least number of live mines per shoot, which was on par with flubendiamide 480 SC @ 0.1 ml/l (3.62 live mines per 10 cm shoot), spinosad 45 SC (5.62 live mines per 10 cm shoot) and flonicamide 50 WG @ 0.3 g/l (6.46 live mines per 10 cm shoot) treatments. Thus, both insecticides and botanicals can be used for management of citrus leaf miner in integrated pest management programme.