POPULATION DYNAMICS AND MANAGEMENT OF PINK BOLLWORM, Pectinophora gossypiella (Saunders) IN Bt COTTON

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dc.contributor.advisorS. G. HANCHINAL
dc.contributor.authorRAKHESH S
dc.date.accessioned2023-12-29T16:26:53Z
dc.date.available2023-12-29T16:26:53Z
dc.date.issued2023-12-29
dc.description.abstractThe influence of weather factors on pink bollworm indicated that maximum and minimum temperature, rainfall, morning and afternoon relative humidity having highly significant, negative correlation with trap catches and larval incidence of pink bollworm. Among them minimum temperature highly influence on trap catches and larval incidence with the R2 value of 78.70 and 92.00. The survey conducted on alternate host of pink bollworm in major cotton growing districts of North-Eastern region of Karnataka recorded nil incidence of pink bollworm on the different malvaceous host plants. The pink bollworm completed its life cycle on Bt-cotton and other malvaceous plants and recorded with the mean total larval period of 21.02 ± 2.40, 18.59 ± 2.03, 18.11 ± 1.93 and 17.75 ± 1.87 days and mean period of life cycle was 42.28 ± 4.22, 37.93 ± 3.84, 37.47 ± 3.74 and 36.91 ± 3.63 days when reared on Bt-cotton, Aelmoschous ficulneus, Abutilon indicum and Abutilon hirtum, respectively. The larval period was more on Bt cotton (21.02 days) as compared to malvaceous plants (17.75-18.59 days). Similarly, total life cycle was more on Bt cotton (42.28 days) as compared to malvaceous plants (36.19-37.93 days).The frequency and time intervention of different insecticides recorded that the lowest larval incidence (2.25 larvae/10 bolls), green boll damage (20.00 %), bad boll opening (20.25 %), locule damage (20.21 %) and highest good boll opening (79.75 %) in the treatment, T1 with four sprays viz., profenofos 50 EC, chlorantraniliprole 18.50 SC, emamectin benzoate 5 SG and bifenthrin 10 EC at 65, 80, 95 and 110 DAS, respectively with the highest benefit cost ratio of 1.55.
dc.identifier.urihttps://krishikosh.egranth.ac.in/handle/1/5810205068
dc.language.isoEnglish
dc.pages192
dc.research.problemPOPULATION DYNAMICS AND MANAGEMENT OF PINK BOLLWORM, Pectinophora gossypiella (Saunders) IN Bt COTTON
dc.subAgricultural Entomology
dc.themePOPULATION DYNAMICS AND MANAGEMENT OF PINK BOLLWORM, Pectinophora gossypiella (Saunders) IN Bt COTTON
dc.these.typeM.Sc
dc.titlePOPULATION DYNAMICS AND MANAGEMENT OF PINK BOLLWORM, Pectinophora gossypiella (Saunders) IN Bt COTTON
dc.typeThesis
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