Content area
Full text
Abstract: With the aim to examine variations in the migration phenology and population of N. lugens along with the advance/retreat of the Asian summer monsoon (ASM) and lay the foundation for further study on predicting the timing and location of N. lugens outbreak, correlation analysis and spatial analysis were applied for estimating the impact of the ASM and its related meteorological factors on the migration phenology and population of N. lugens in China in this paper. The ASM had a positive effect on the occurrence and outbreak of N. lugens. First, the first appearance date of N. lugens was consistent with seasonal advances of the northernmost location of the ASM, and the ASM provided the dynamic condition for the northward migration of N. lugens. Second, outbreak of N. lugens occurred in the area under the control of the ASM, and the ASM provided the survival condition for the population of N. lugens. Third, the population was positively related to the northernmost location of the ASM, θε (850hPa) and wind speed (850hPa). Particularly, the stronger southwest wind caused the date of the first, peak and last catches of N. lugens to turn up earlier than in the extremely years.
Key words: Nilaparvata lugens; insect migration; phenology; Asian summer monsoon; meteorological factors
CLC number: S431 Document code: A
1INTRODUCTION
Nilaparvata lugens (Stål) (Homoptera: Delphacidae) is a major rice pest throughout Asia, which is one of the primary rice-growing regions worldwide. The population and migratory behavior of N. lugens are associated with rice developmental stages, weather and climate conditions (Cheng and Holt[1]; Cheng et al.[2]; Jadhao and Khurad[3]). Wind is a major driving force for the long-range migration of N. lugens. The flight speed of N. lugens is a function of its flight speed and the wind speed (Rosenberg and Magor[4]; Kisimoto and Rosenberg[5]; Riley et al.[6]). And moderate temperature and suitable humidity level are important factors in the population dynamics and migratory behaviors (takeoff, flight direction and distance, landing, etc.) of N. lugens (Pender[7]). Relative humidity of 70%-85% in summer and 40%-50% in autumn are conducive to increases in N. lugens populations, whereas rainfall causes N. lugens to cease flying. A temperature of 20-30°C is generally considered the most suitable for the survival and growth...