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    ThesisItemOpen Access
    BIOLOGY AND MANAGEMENT OF DIAMONDBACK MOTH, Plutella xylostella ON CRUCIFERS
    (COLLEGE OF HORTICULTURE AND FORESTRY, DR Y S P UHF, NERI, HAMIRPUR, 2019-12-02) MEENAKSHI; KUMAR, SUNIL
    The present investigations entitled “Biology and Management of Diamondback moth, Plutella xylostella on crucifers” was carried out in the Department of Entomology, College of Horticulture and Forestry, Neri (Hamirpur), Himachal Pradesh. Experiments were conducted to understand and collect data on selected aspects of diamondback moth (DBM), Plutella xylostella like study of biology of DBM i.e. studied on four hosts of crucifer crops. Among these cauliflower and cabbage showed short life cycle as compared to radish and mustard. The total life cycle was completed faster in cauliflower (21.40 days) and in cabbage (25.20 days). Egg hatched (out of 100 eggs) was highest in mustard (98.00) followed by cauliflower (97.80). In bio-efficacy studies of different leaf extracts and agniastra against DBM indicated that overall mean per cent larval and pupal mortality were 46.44 and 80.67, respectively at 2.0% concentration of agniastra and minimum per cent larval and pupal mortality were 14.55 and 48.89 were recorded in aqueous leaf extract of bhang at 5.0%. From the result we can conclude that agniastra was the best formulation for the management of DBM in crucifer crops when the formulation applied at larval stages. The maximum per cent antifeedant activities were shown by 2.0% agniastra (83.56) followed by 10% aqueous leaf extract of eupatorium (67.99) higher than the standard check (chloropyriphos @ 0.01%). Bioefficacy studies of different aqueous seed extracts and cow urine against DBM, indicated that over all mean per cent larval and pupal mortality were achieved at 10% aqueous NSKE were 78.10 and 83.89, respectively. In repellent effect, NSKE have maximum per cent repellent rate 84.63 at 10% concentration and minimum 38.93 at 2.0% concentration of cow urine.