A WSN-Based Oriental Fruit Fly Monitoring System with a Light Luring Mechanism

• Main Authors: Yu-Yuan Liu, 劉育源
• Other Authors: 顏炳郎
• Format: Others
• Language: en_US
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/88686128999361994852

碩士 === 國立臺灣大學 === 生物產業機電工程學研究所 === 103 === The fruit products in Taiwan are greatly attacked by the oriental fruit fly (Bactrocera dorsalis (Hendel), OFF). If no prevention measure is taken, the damage rate of the fruit caused by the OFF will reach 10 to 30%, and the agricultural and economic loss may reach approximately NT$ 4 billion every year in Taiwan. Therefore, the main goal of this study is to develop an appropriate OFF prevention method to reduce the agriculture loss caused by the pest. Traditionally, OFF prevention mainly relies on the senses of smell and sight of OFFs, but some studies indicate that vision and olfactory attraction not only play alone for luring but also have complementary effects. Thus, this study utilizes the characteristics of OFFs to design a trap to measure and capture the pests. For OFF prevention, this paper combines LED lights with methyl eugenol as the lure to attract OFFs. In the monitoring system, the pest information (e.g. the number of pests, air temperature, relative humidity, illumination) is collected by a wireless sensor network. Two experiments are conducted and the LEDs are turned on at day. In the first experiment, the LED is combined with methyl eugenol. Six LEDs (four with single peak wavelengths at 465, 520, 600 and 635 nm, and the white LED with double peak wavelengths at 450 and 550 nm and the purple LED with double peak wavelengths at 450 and 650 nm) are mounted in the trap to provide lighting. Among the six LEDs OFFs are more attracted to the red, yellow and green LEDs compared to the white, purple, blue LEDs and without using an LED, but no difference is found between the attractiveness of the red, yellow and green LEDs. The higher attractiveness of the red, yellow, and green LEDs indicates that the chromatic stimulation of the spectra between 500 and 570nm, and 580 and 650nm contains crucial cues for attracting OFFs. In addition, the white and purple LEDs used in the experiment have the broadest spectrum but no difference in attractiveness is found among the white and purple LEDs, the blue LED, and without an LED. Thus, it is reasonable to assume that there is a negative cue that reduces the attractiveness in the spectrum between 450 and 490 nm. In the second experiment, three luring arrangements are tested. The trap in the first luring arrangement only contains methyl eugenol. Both the LEDs with the best luring results and methyl eugenol are placed in the trap for the second arrangement. In the last arrangement the trap only contains the LEDs with the best luring results. The goal of these luring arrangements is to determine whether the LEDs along can attract OFFs or the LED combining methyl eugenol yields the best result. The experimental results show that temperature and the number of OFFs are closely related. It is also found that it is possible to capture OFFs at night, but the capture rate is higher during the daytime than during the nighttime.