STUDIES ON ARTHROPOD PESTS OF APPLE AND THEIR NATURAL ENEMIES IN DIFFERENT FARMING SYSTEMS

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dc.contributor.advisorP L Sharma
dc.contributor.authorNIKITA CHAUHAN
dc.date.accessioned2024-07-26T09:34:33Z
dc.date.available2024-07-26T09:34:33Z
dc.date.issued2024-07-09
dc.description.abstractThe present investigations entitled “Studies on arthropod pests of apple and their natural enemies in different farming systems” were conducted during the year 2022 and 2023 at Dr. Y S Parmar University of Horticulture and Forestry, Nauni, Solan, Himachal Pradesh. The diversity of apple pests and natural enemies varied with different combinations of variety, planting density and farming system. Aphis pomi De Geer, Eriosoma lanigerum (Hausmann), Quadraspidiotus perniciosus (Comstock), Panonychus ulmi (Koch) and Tetranychus urticae Koch, Dorysthenus huegelii (Redtenbacher), Apriona cinera (Chevrolat), Zeuzera multistrigata (Moore), Archips termias (Meyrick), Helicoverpa armigera (Hübner), Anomala dimidiata (Hope), Anomala lineatopennis (Blanchard), Brahmina coriacea (Hope) and Brahmina flavoserica (Bost) was found across a wide range of apple varieties (Jeromine, Red Velox, Super Chief, Auvial Early Fuji, Gale Gala, Scarlet Spur and Royal Delicious) and natural enemies recorded on all studied varieties, planting densities and farming systems were Coccinella septempunctata (Linnaeus), Hippodamia variegata (Goeze), Chrysoperla zastrowi sillemii (Esben-Peterson), Harmonia dimidiata (Fabricius), Oenopia sauzeti (Mulsant), Oenopia kirbyi Mulsant, Cheilomenes sexmaculata (F.), Scymnus posticalis Sicard, Chilochorus infernalis Mulsant, Ischiodon scutellaris (Fabricius), Sphaerophoria indiana Bigot, Episyrphus viridaureus (Wiedemann), Eupeodes corollae (Fabricius) and Aphelinus mali (Haldeman). In laboratory studies on demographics of pests and related natural enemies of apple, showed that all pests and natural enemies completed their life cycle on all the varieties successfully. Predatory potential and density responsiveness of natural enemies like O. kirbyi, S. posticalis, C. zastrowi sillemi, N. longispinosus and A. mali showed promising results against respective apple pests. The predatory potential increased with predator age. For all natural enemies, significant negative linear coefficients were obtained after logistic regression analysis between proportion of prey nymphs consumed (Na/N) and initial prey density (N) which indicated the Type-II functional response for all the stages of natural enemies. The attack rate decreased and increasing handling time with the advancement of the development stage of the prey in all the cases.
dc.identifier.urihttps://krishikosh.egranth.ac.in/handle/1/5810212527
dc.keywordsSTUDIES ON ARTHROPOD PESTS OF APPLE AND THEIR NATURAL ENEMIES IN DIFFERENT FARMING SYSTEMS
dc.language.isoEnglish
dc.pages344+vi
dc.publisherUHF Nauni
dc.subEntomology
dc.themeStudies on arthropod pests of apple and their natural enemies in different farming systems
dc.these.typePh.D
dc.titleSTUDIES ON ARTHROPOD PESTS OF APPLE AND THEIR NATURAL ENEMIES IN DIFFERENT FARMING SYSTEMS
dc.typeThesis
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