LIFE TABLE, SEASONAL ABUNDANCE AND CONTROL OF LUCERNE POD BORER, Helicoverpa armigera (Hubner) Hardwick

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dc.contributor.advisorPatel, C. C.
dc.contributor.authorDABHI, MAHENDRASINH VINODBHAI
dc.date.accessioned2018-06-29T06:06:34Z
dc.date.available2018-06-29T06:06:34Z
dc.date.issued2003
dc.description.abstractPresent investigations on life table, seasonal abundance and control of lucerne pod borer, Helicoverpa armigera (Hubner) Hardwick were carried out at the Department of Entomology, B. A. College of Agriculture, Gujarat Agricultural University, Anand Campus, Anand and Main Forage Research Station, Gujarat Agricultural University, Anand Campus, Anand- 388 110 during the year 2001-2003. Study on life table of H. armigera on different hosts clearly indicated that the maximum expectancy of newly deposited eggs was recorded on chickpea followed by sorghum and lucerne. The highest survival of immature stages was recorded on lucerne followed by chickpea and sorghum. On the basis of net reproductive rate (Ro), the host can be categorized in descending order as chickpea > sorghum > lucerne. The lowest mean length of generation was recorded on sorghum and highest on lucerne. The intrinsic rate of natural increase in numbers (rm) was 0.1185 and 0.1195 and 0.1302 females per female per day on sorghum, lucerne and chickpea, respectively. Considering the value of 'rm' the host can be arranged as chickpea > lucerne > sorghum. Similarly, the finite rate of increase in numbers (X,) ranged from 1.137, 1.126 and 1.46 females per female per day on lucerne, sorghum and chickpea, respectively. A study on seasonal abundance showed that the pest was active from first week of January to the second week of May. The pest incidence started in first week of January, which slowly increased and reached to a peak in the first week of February. The larval population remained steady during second and third week of February (1.3 and 1.1 larvae/sq. meter area). However, it reached to peak of 2.8 larvae/sq. meter area during fourth week of February. Thereafter, the activity of the pest steadily declined from beginning of March to the end of March. The population remained steady from the first week of April to the first week of May (0.7 to 0.9 larvae/sq. meter area) and reached to a peak of 1.2 larvae per sq. meter area in the second week of May. Thus, there were three population peaks during first week of February (2.1 larvae/sq. meter area), fourth week of February (2.8 Jarvae/sq. meter area) and second week of May (1.2 larvae/sq. meter area). Role of different physical factors of environment in causing the fluctuation of larval population in lucerne was determined. The correlation study in lucerne crop revealed that maximum temperature and relative humidity in the morning hours were negatively and positively correlated with the population buildup of H. armigera, respectively, whereas other physical factors had no any effect in causing fluctuation of the pest population. Various insecticides were tested for the control of lucerne pod borer, H. armigera in lucerne seed production. Among various treatments, endosulfan 0.07 per cent was significantly superior over the rest of the treatments in controlling the larval population and it was at par with quinalphos 0.05 per cent in increasing the seedyield. Polytrin C 0.044, chlorpyriphos 0.05 and cypermethrin 0.01 per cent were at par with each other in controlling the pest as well as increasing the seed-yield. Considering the economics of the insecticides, all the treatments gave appreciable NICBR (Net Incremental Cost Benefit Ratio). The chronological order of various insecticidal treatments based on NICBR is : quinalphos 0.05 per cent (1:26.98) > chlorpyriphos 0.05 per cent (1:24.53) > cypermethrin (1:22.81) > endosulfan 0.07 per cent (1:21.21) > NSKS 5 per cent (1:19.82) > Gronim 0.0005 per cent (1:13.15) > Polytrin C 0.044 per cent (1:12.12) > profenophos 0.05 per cent (1:10.34) > HaNPV 250 LU (1:6.85). However, the highest NICBR was recorded in the treatments of quinalphos 0.05 per cent followed by chlorpyriphos 0.05, cypermethrin 0.01, endosulfan 0.07 and NSKS 5 per cent.en_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/5810055660
dc.keywordsLIFE TABLE, SEASONAL ABUNDANCE, CONTROL OF LUCERNE POD BORER, Helicoverpa armigera (Hubner) Hardwicken_US
dc.language.isoenen_US
dc.publisherAAU, Ananden_US
dc.research.problemLIFE TABLE, SEASONAL ABUNDANCE AND CONTROL OF LUCERNE POD BORER, Helicoverpa armigera (Hubner) Hardwicken_US
dc.subAgricultural Entomologyen_US
dc.subjectAGRICULTURAL ENTOMOLOGY, AGRICULTUREen_US
dc.subjectA STUDYen_US
dc.themeLIFE TABLE, SEASONAL ABUNDANCE AND CONTROL OF LUCERNE POD BORER, Helicoverpa armigera (Hubner) Hardwicken_US
dc.these.typeM.Scen_US
dc.titleLIFE TABLE, SEASONAL ABUNDANCE AND CONTROL OF LUCERNE POD BORER, Helicoverpa armigera (Hubner) Hardwicken_US
dc.typeThesisen_US
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