研究报告

Spectral Characteristics of the Damaged Rice Plant by Brown Planthopper, Nilaparvata lugens

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  • Department of Entomology, College of Plant Protection, Nanjing Agricultural University/Key Laboratory of Monitoring and Management of Crop Diseases and Pest Insects, Ministry of Agriculture, Nanjing 210095, China; *Corresponding author, E-mail: liuxd@njau.edu.cn

Received date: 1900-01-01

  Revised date: 1900-01-01

  Online published: 2010-03-10

Abstract

The reflectance of rice plant damaged by the brown planthopper(BPH, Nilaparvata lugens) was measured using an ASD handheld spectroradiometer. The results showed that the spectral reflectances at the range of wavelengths of visible light and near infrared regions decreased significantly with the increase of the number and instar of BPHs. The damage degrees of rice plants caused by the BPH nymphae with different numbers or at different instars, and by the oviposition behaviour of adult were expressed well by the spectral reflectance in the nearinfrared wavelengths. The reflectance was negatively correlated with the number of BPHs, and the correlation coefficients were significant at the range of wavelengths of 520-570 nm and 700-1000 nm. The red edge slope (Dλred) and red edge area (Sred) of the reflectance also significantly correlated with the number of nymphae. The linear models for forecasting the occurrence number of BPHs were built using following relative indexes to the undamaged plants: the spectral reflectance at the wavelengths of 550 nm (R550) and 760 nm (R760), and the red edge indexes (Dλred and Sred). The accuracy of the models were 53%-79% for the 19 times tests. The factor of R760 was efficient for forecasting the number of BPHs.

Cite this article

SUN Qihua,LIU Xiangdong* . Spectral Characteristics of the Damaged Rice Plant by Brown Planthopper, Nilaparvata lugens [J]. Chinese Journal OF Rice Science, 2010 , 24(2) : 203 -209 . DOI: DOI: 10.3969/j.issn.1001-7216.2010.02.16

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