Dissertation > Excellent graduate degree dissertation topics show

Millimetric Scanning Entomological Radar Observations and Trajectory Analysis of Migratory Behavior of Planthoppers

Author: QiHuiHui
Tutor: ChengDengFa
School: Chinese Academy of Agricultural Sciences
Course: Agricultural Entomology and Pest Control
Keywords: Millimetric scanning entomological radar Brown planthopper White back planhopper Trajectory analysis
CLC: S435.112.3
Type: Master's thesis
Year: 2011
Downloads: 82
Quote: 1
Read: Download Dissertation

Abstract


The planthoppers are one of the most serious pests of rice in China. Successive outbreaks of planthoppers with serious damage to rice production have been recorded in recent years in China. Monitoring and forecasting is the basis for effective prevention and control. In order to obtain better understanding of the flight behavior parameters and population dynamics of planthoppers, we observates the migration behavior of the planthoppers by using an 8.0 mm wavelength scanning entomological radar, a searchlight trap and a Jiaoduo light trap. The Hysplit4 software was used to calculate particle trajectories for clearifying the source areas of migrant planthoppers.The brown planthoppers formed 3 insect density layers at the heights of 300 to 400 m, 500 to 700 m and 800 to 1100 m above the ground in autumn, 2009. These layers were well-defined and related to the maximum wind speeds. The aerial insect density increased soon after the sunset, and reached the maximum at about 20:00 h. Generally, the insect density decreased after the midnight, but sometimes the high density kept through 5:00 in the morning. The collective orientation of brown planthoppers was observed with the radar and the orientation direction was toward south or north with an angle to the downwind direction.Although the time of peaking migration and the density of migrants varied through years, the general displacement direction was almost constant. In May to June, the planthoppers in the northern Vietnam and southern Guangxi Municipality immigrated into Xing’an, Guangxi in southwestern winds. When the early season rice was mature, the planthoppers immigrated into the middle-eastern Hunan province in 12 hrs, and into the middle Anhui province and southwestern Henan province in 24 hrs. The migration during autumn was complicated, with the immigration and emigration occurred at the same time, and the middle-eastern Hunan province was the main source area. The planthoppers in the Xing’an Guangxi Municipality in autumn would immigrate into the middle Guangxi in 12 hrs, and into the southwest Guangxi and northern Vietnam in 24 hrs.The rainfall caused mass descent into the immigration areas. The vertical air currents had little effects on the migration, because the vertical air currents were relatively weak during the peak migration season.The sex ratio （female: male） varied significantly. It was greater in the searchlight trap than that in the Jiaduo light trap for brown planthoppers. The sex ratio in the middle-season rice and late-season rice was greater than or equal to 1. The females of white back planthoppers in the searchlight trap were more than the males, in contrast to lesser females in the Jiaduo light trap. The sex ratio is greater than 1 in the tillering to jointing stage of middle-season rice and late waxen maturity stage of late-season rice.

Related Dissertations

  1. Spectral Characteristics of Rice Damaged by Nilaparvata Lugens (St(?)l) and Cnaphalocrocis Medinalis(Guen(?)e),S435.112
  2. Breeding Restoret Lins with Resistance to Brown Planthopper in Hybrid Rice by Molecular Marker Assisted Selection,S511
  3. Conductance of Several Chemical Elements in Rice Plant-Brown Planthopper (Nilaparvata Lugens St(?)l) System and Their Physiological Effect,S435.112.3
  4. OBSERVATIONAL STUDY ON BLACK CARBON AEROSOLS IN RURALAND REMOTE SITES OF CHINA,X513
  5. The Research of Editorial on New Year and National Day of "People’s Daily" Since the Founding of the PRC,G219.29
  6. STUDIES ON CHAOTIC PROPERTY OF BROWN PLANTHOPPER (Nilaparvata Lugens st(?)l) OCCURRENCE SYSTEM AND BPH’S FORECASTING MODELS,S435.112.3
  7. Epidemic and Control of Rice Stripe Disease in Rice Growing Area Along the Yellow River,S435.111.4
  8. Genetic Analysis and Molecular Mapping of QTL for Rice Black-Streaked Dwarf Disease Resistance in Rice,S511
  9. Evaluations of Virulence Indexes and Studies on Virulence Variations of Nilaparvata Lugens (St(?)l),S435.11
  10. Imidacloprid Resistance in Brown Planthopper, Nilaparvata Lugens (St(?)l) and the Mechanisms,S481.4
  11. System Trajecotry Analysis for Spatial Community Succession and Its Application in A～2/O Fixed Biofilm Process for Coking Wastewater Treatment,X703
  12. Morphological Obervation, in Vitro Clture and Molecular Biology Study of the Yeast-Like-Symbiots of the Brown Planthopper Nilaparvata Lugens(St(?)l),S435.112.3
  13. Resistance to Small Brown Planthopper and Its Mechanism in Rice Varieties,S435.112.3
  14. Teleconnection between the Advance SST, ENSO Indices and Early-season Immigration of Nilaparvata Lugens (St(?)l) and Its Implications for Medium-and Long-term Forecasting,S435.112.3
  15. The Physiological and Biochemical Mechanisms of Resurgence of Brown Planthoppers(Nilaparvata Lugens St(?)l) Induced by Insecticides and Effects of Insecticides on Enzyme Activity of Non-target Species,S435.112.3
  16. The Nutritional Function and Its Molecular Basis of Yeast Like Symbiotes in Rice Brown Planthopper,Nilaparvata Lugens(St(?)l),S433
  17. Genetic Analysis and Molecular Mapping of Two Brown Planthopper Resistance Genes Derived from Wild Rice,S511.9
  18. Studies of Regulation of Gene Expression in Rice Responding to Brown Planthopper and Cloning Resistance Related cDNAs,S435.11
  19. The Cloning and Characterization of Brown Planthopper Responsive Genes in Rice Seedlings,S435.11
  20. Genetic Analysis and Mapping of Brown Planthopper Resistance Genes in Rice and Constructing of Molecular Function Map,S435.11
  21. Construction of Genomic Library from BPH Resistant Rice B5 and Fine Mapping of the Resistant Locus Qbp1 on Chromosome 3,S435.11

CLC: > Agricultural Sciences > Plant Protection > Pest and Disease Control > Crop pests and diseases and their prevention > Cereal crop pests and diseases > Rice pests and diseases > Insect pest > Planthopper
© 2012 www.DissertationTopic.Net  Mobile