BIOLOGY OF Spodoptera litura (Fabricius) ON DIFFERENT HOSTS, ITS POPULATION DYNAMICS AND MANAGEMENT IN TOBACCO NURSERY

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dc.contributor.advisorKOSHIYA, D. J.
dc.contributor.authorBaloliya, K. F.
dc.date.accessioned2018-04-20T05:40:56Z
dc.date.available2018-04-20T05:40:56Z
dc.date.issued2001
dc.description.abstractThe present investigations on biology of Spodoptera litura (Fab.) on different hosts, life tables, population dynamics, management, relative toxicity of different insecticides and susceptibility of different larval instars to NPV were conducted during the year 1999-2000 at B.A.College of Agriculture, Gujarat Agricultural University, Anand Campus, Anand. Studies on biology of this pest were carried out at a constant temperature (27 ± 1°C) on castor, tobacco, cotton and cabbage. The female moths deposited pale whitish eggs in clusters with a layer of 1 to 3; usually on lower surface of leaves. The eggs were round in shape and measured 0.45 ± 0.013 to 0.48 ± 0.006 mm in diameter. The mean incubation period did not influenced by the hosts, but it ranged from 3.30 to 3.80 days with the hatching per cent of 80.27 to 84.38 on these hosts. On hatching, larva emerged out from the egg by cutting the chorion. The larva passed through six distinct instars on all the four hosts under study and each instar was distinct in size, shape and appearance. The average duration of first instar larvae was recorded 3.10, 3.27, 3.40 and 3.37 days on castor, tobacco, cotton and cabbage, respectively. The period of second, third, fourth, fifth and sixth instarson these hosts was observed 2.27, 2.63, 3.53 and 3.13 days; 2.80, 2.87, 3.73 and 3.43 days; 2.73, 3.00, 3.63 and 3.73 days; 3.13, 3.37, 4.03 and 3.87 days and 3.77, 4.33, 5.13 and 5.13 days, respectively. The total larval period differed significantly, when they were developed on these hosts, the shortest duration (18.10 days) was observed on castor and the longest (23.47 days) on cotton. The per cent larval survival was also higher cm castor (92.50 percent) as compared to tobacco, cotton and cabbage being 85.00, 80.00 and 87.50 per cent, respectively. Considering the growth index values, the growth of larvae was faster on castor as compared to remaining hosts. Thus, castor proved to be the most suitable host for the growth of larvae of this pest. The pre-pupal period ranged from 2 to 3 days on the four hosts under study. The pupal period was significantly influenced by the hosts. The longest duration (9.50 days) was recorded on cotton which was followed by cabbage (9.23 days), tobacco (9.20 days) and castor (9.06 days). The longevity of male moths was observed 7.25, 6.58, 6.50 and 6.67 days, while of the female moth was 11.33, 10.92, 11.00 and 10.92 days on the respective hosts. Preoviposition, oviposition and post-oviposition periods were found 1.33, 1.25, 1.58 and 1.50 days; 7.67, 7.33, 6.75 and 6.83 days and 2.25, 2.33, 2.67 and 2.50 days on castor, tobacco, cotton and cabbage, respectively. The highest fecundity of female moths was recorded on castor (2264.17 eggs/ female), whereas the lowest on cotton (1569.50 eggs/female). The life span of the female moth was longer than the male on all the four hosts. The total life span (egg to death of adult) of male ranged from 35 to 40, 36 to 41, 41 to 46 aid 41 to 45 days, whereas of the female varied from 40 to 44, 41 to 45, 46 to 50 and 46 to 49 days, when they were developed on castor, tobacco, cotton and cabbage, respectively. Study on life fecundity tables of this pest on different varieties of tobacco revealed that the highest survival of immature stages was recorded on GTH-1 followed by GT-5 and GT-7. On the basis of reproductive potential (Ro),the varieties can be arranged as : GTH-1 > GT-5 > GT-7. The mean length of generation was almost equal on all the three varieties, however, it was lowest on GT-7. The intrinsic rate of natural increase in numbers (rm) ranged from 0.1503 to 0.1594 females per female per day. Thus, among the different tobacco varieties GTH-1 proved to be the most suitable for this pest. Results of the population dynamics under nursery conditions revealed that the pest remained active throughout the nursery period, however, the larval population was at peak in first week of September. Among various physical factors of environment responsible for causing the fluctuation of population, mean vapour pressure showed significant negative correlation with the population. Nine insecticides were tested against S. litura in tobacco nureery, of which quinalphos 0.05%, polytrin C 0.044% and profenophos 0.05% were found to be the most effective in reducing die damage as well as obtaining the highest numbers of healthy seedlings.en_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/5810044218
dc.keywordsBIOLOGY OF Spodoptera litura (Fabricius), DIFFERENT HOSTS, POPULATION DYNAMICS, MANAGEMENT, TOBACCO NURSERYen_US
dc.language.isoenen_US
dc.publisherAAU, Ananden_US
dc.research.problemBIOLOGY OF Spodoptera litura (Fabricius) ON DIFFERENT HOSTS, ITS POPULATION DYNAMICS AND MANAGEMENT IN TOBACCO NURSERYen_US
dc.subAgricultural Entomologyen_US
dc.subjectAGRICULTURAL ENTOMOLOGY, AGRICULTUREen_US
dc.subjectA STUDYen_US
dc.themeBIOLOGY OF Spodoptera litura (Fabricius) ON DIFFERENT HOSTS, ITS POPULATION DYNAMICS AND MANAGEMENT IN TOBACCO NURSERYen_US
dc.these.typeM.Scen_US
dc.titleBIOLOGY OF Spodoptera litura (Fabricius) ON DIFFERENT HOSTS, ITS POPULATION DYNAMICS AND MANAGEMENT IN TOBACCO NURSERYen_US
dc.typeThesisen_US
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