Influences of different damaged degrees of leafminer-infected leaves on the near-infrared spectral reflectance

Wu Dake; Ma Chengwei; Du Shangfeng

Volume 23 Issue 2

Feb. 2007

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Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE) > 2007 > 23(2): 156-159.

Wu Dake, Ma Chengwei, Du Shangfeng. Influences of different damaged degrees of leafminer-infected leaves on the near-infrared spectral reflectance[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 2007, 23(2): 156-159.

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Influences of different damaged degrees of leafminer-infected leaves on the near-infrared spectral reflectance

1.
College of Engineering and Technology, Southwest University, Chongqing 400716, China
2.
Key Laboratory of Agricultural Bio-environmental Engineering, Ministry of Agriculture, China Agricultural University, Beijing 100083, China

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Received Date: December 18, 2005
Revised Date: September 27, 2006
Published Date: February 27, 2007

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Abstract

Abstract

In order to find out an automatic monitoring method of plant insect pests, leaves infected by the leafminer were studied. Using image processing and spectroscopy analysis technology, near-infrared spectral reflectance of leaves infected by the leafminer was measured; damaged degrees(DD) of leaves and the ratios of the dry and fresh leaf weights(DFLW) were calculated. The regression results between DFLW and the near-infrared spectral reflectance are as follows: R² value between cucumber leaves and the near-infrared spectral reflectance is 0.79 (at 1452 nm) and the tomatoes' is 0.70(at 1450 nm); the R² value between the cucumber's DD and the near-infrared spectral reflectance is beyond 0.81(at 1436～1466 nm), tomato's is beyond 0.69(at 1436～1468 nm), respectively. The experiment and analysis results show that the leaf damaged degrees can be reflected by the near-infrared spectral reflectance of leafminer-infected leaves.
- leafminer,
- near-infrared spectral reflectance,
- leaf,
- image processing

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