Monitoring of Aphis gossypii Using Greenseeker and SPAD Meter
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Monitoring of Aphis gossypii Using Greenseeker and SPAD Meter Guolong Zhang 1 & Xu Tao 2 & Ze Zhang 1 & Yinxi Du 3 & Xin Lü 1
Received: 16 October 2015 / Accepted: 11 April 2016 # Indian Society of Remote Sensing 2016
Abstract Cotton aphid (Aphis gossypii) is considered as one of the most important agriculture pest for the cotton production. However, it is generally labor-intensive and timeconsuming to obtain some information of Cotton aphid with conventional methods through direct measurement by sampling in the field. This study explores the potential of using a new method to obtain information of the Cotton aphid rapidly. In our study, the cotton canopy spectral indices (NDVI, VI_2, REDrefc, NIRrefc) and chlorophyll concentration, obtained from hand-held high spectrometer GreenSeeker and chlorophyll meter SPAD-502 and Cotton aphid amount derived from the artificial field-based survey were used to uncover the relationship between Cotton aphid amount and canopy spectral index and SPAD value of the cotton in city of Shihezi, China. The results showed that NDVI and NIRrefc were negatively related to Cotton aphid amount. VI_2 content had a significant and positive relationship with its amount. The non-linear three cubic models with alate Aphid amount as independent variables have been established between VI_2 value and alatae Aphid amount, which could explain 92.37 % of VI_2 value variance. SPAD values were also significantly and negatively correlated to the Aphid amount. The non-linear logarithm model with wingless Aphid amount as independent
* Xin Lü [email protected] 1
Shihezi university, Shihezi, Xinjiang 832000, China
2
Changji Hui Autonomous Prefecture of Agriculture, Changji, Xinjiang 831100, China
3
The No.2 Senior High School of Jinchuan Head School, Jinchang, Gansu 737100, China
variables was the best for uncovering the relationship between SPAD value and wingless Aphid amount, which could explain 85.48 % of SPAD value variance. The results demonstrate the establishment of the function model provides a theoretical basis and techniques for indirect and rapid monitoring and management of Cotton aphid. Keywords Aphis gossypii . Canopy spectra . Function model . GreenSeeker . SPAD-502
Abbreviations NDVI Normal Differential Vegetation Index VI_2 The ratio of red light and near infrared REDrefc (650 ± 10 nm) red light reflectance NIRrefc (770 ± 15) nm of near infrared reflectance SPAD Soil and Plant Analyzer Development
Introduction Cotton aphid (Aphis gossypii) is regarded as one of the three major pests (cotton bollworm, cotton aphid, and cotton spider mites) for reducing the cotton production in north China (Li 2003). The damage is especially more serious during the period of cotton seedling. And how to acquire real-time crop growth and heath information is a hot area of research for the modern agriculture. Therefore, this study try to explore a new method of monitoring cotton aphid based on mastering the occurrence regularity of cotton aphid. And then the cotton aphid can be warned and forec
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