Imperial Journal of Interdisciplinary Research (IJIR) Vol-2, Issue-7, 2016 ISSN: 2454-1362, http://www.onlinejournal.in Comparative Study on Nocturnal Insects Attracted To Various Light Sources Jismy M Antony1 & Anu P Sebastian2 1,2 Department of Zoology, Assumption College Changanacherry Abstract: This study investigated the influence of different sources of light such as such as CFL bulb, Incandescent bulb, and LED bulb on nocturnal insects. Insect collections were found to be higher in the rainy day than the normal dry day. Light attracted insect includes Kissing bug, Moth, Grasshopper, Cricket, Dragonfly, Bugs, Butterflies, Lantern fly. Six orders of insects were found to be attracted to the light source with a significant dominance for incandescent bulb followed by CFL bulb and least towards LED bulb. Among the insects order Dipterans are the dominant group that attracted to the light sources. Hemipteran were found to attracted secondly towards all the light source. 1. Introduction Phylum Arthropod occupies the first place in the animal kingdom. It is the largest and the most dominant group of animal on the earth at present. Arthropod is generally segmented coelom and jointed limbed animals with exoskeleton containing chitin, moulting periodically and without true nephridia cilia in there structure.[15] Arthropod has mainly five classes .They are Crustacean, Arachnoidia, Insecta, Myriapoda, and Onychophora.Insects which are attracted the light at night porch light and other artificial light sources are usually buzzing with flying insect. Most insects have two types of photoreceptive organs, compound eyes and ocelli. Artificial light attract moth, flies, beetles, and all sort of other insect.Unfortunately for the insect their attracted to artificial light is a cruel trick caused by our innovation moving faster than their evolution .Night flying insect evolved to navigate by the light of the moon .By keeping the moon reflected light at a constant angle the insect can maintain a steady light path and a straight source .Artificial light interfere with an insect’s ability to detect the moonlight .They appear bright and radiate their light in multiple direction. Once an insect flies close enough to a light bulb it attempt to navigate by way of the artificial light rather than the moon. Of the light sources that attract nocturnal insects, those that emit relatively large amounts of UV radiation (blue fluorescent lights, black lights, and mercury lamps) exert the strongest attraction [3,7,17] Insect light traps using blue fluorescent Imperial Journal of Interdisciplinary Research (IJIR) light were used widely to control rice stem borer, Chilo suppressalis Walker, and Tryporyza incertulas Walker moths in paddy fields across Japan during World War II and the postwar period [13]. Insects that are attracted to these yellowish devices include important crop pests such as planthoppers, leafhoppers, aphids, whiteflies, thrips, and leafminer flies [10,16,22].The purpose of this study was to compare the potential impact of these various lamps on insect ecologies. The purpose of this study was to compare the potential impact of these various lamps on insect ecologies 2. Methods A comparative study were done on the attracting insect towards different light sources such as LED bulb, Incandescent bulb, and CFL bulb were evaluated. Study area is located in Kainakarypanchayath, Alappuzha district. Sampling involved using of improvised setup of four blue LED white bulbs, four Incandescent bulbs, and four CFL bulbs arranged randomly and installed at three Corners of the house. Oil papers were placed on the side of the bulbs used to trap the insects. The study was conducted for one month and it was during the 1 st December 2015 to 31 st December 2015 .The data was recorded everyday of the all 4 weeks. Data recording was done during night hours from 7 pm to 11 pm. The insect orders were identified using insect key, data were tabulated, analyzed and discussed in relation to available literature. 3. Results Insect collections were significantly different according to the Climate. The phenomenon of light attraction towards light source is maximum in the first and second week, of the experiment. Insect collections were found to be higher in the rainy day than the normal dry day. Light attracted insect includes Kissing bugs, Moths, Grasshoppers, Crickets, Dragonflies, Bugs, Butterflies, Lantern flies.Six orders of insect were found attracted to the light source with a significant dominance for incandescent bulb followed by CFL bulb and least towards LED bulb. Among the insects order Dipterans is the dominant group that attracted to Page 1559 Imperial Journal of Interdisciplinary Research (IJIR) Vol-2, Issue-7, 2016 ISSN: 2454-1362, http://www.onlinejournal.in the light sources.Hemipteran were found to attracted secondly towards all the light source. Orthoptera, Lepidoptera,Odonata and Homoptera were also found towards light source.See Table:1 Table 1: LIGHT ATTRACTION CAPABILITY OF VARIOUS INSECTS INCANDESCENT LAMPS CFL LAMPS ORDERs LED LAMPS ODONATA 1 7 2 12 3 9 4 4 1 12 2 65 3 8 4 5 1 7 2 3 3 4 4 8 LEPIDOPTERA 7 8 12 9 8 5 2 3 2 9 14 5 DIPTERA 78 81 76 65 34 25 24 42 58 53 47 49 HEMIPTERA 31 38 40 29 9 14 8 9 15 4 4 9 ORTHOPTERA 12 8 13 14 8 5 6 4 7 6 8 9 HOMOPTERA 7 14 8 11 6 8 2 1 2 4 1 0 4. Discussion Light attraction of insect fauna towards different light sources was found to be an interesting phenomenon in nature. Hongayo Menelo et al 2014 reported that insects belonged to ten orders were found to be attracted to different light sources and were Lepidoptera, Hymenoptera, Dipterans, Orthoptera, Hemiptera, Psocoptera, Isopterans, Neuropteran and Embiidina.Present study clearly revealed that insects collected ,around from the various light sources belongs to the the Orders Odonata, Lepidoptera, Diptera, Hemiptera, Orthoptera and Homoptera. The insect orders attracted towards the light with a significant dominance for Diptera followed by Hemiptera and Orthoptera. The maximum number of insects were attracted towards Incandescent bulbs followed by CFL and LED bulbs. The members of Dipterans composed of flies and they may get attracted to the various light sources due to the response of their visual stimuli .Second group of insects attracted belongs to the order Hemiptera. The phenomenon of insect attraction towards various light sources may be due to the physiological mechanism that synchronise with the frequency or wavelength of the light spectrum.Most of the insects were attracted to artificial light sources because of its colour,heat .These responses to light are substantially influenced by a variety of factors, including light intensity and wavelength, combinations of wavelengths, time of exposure, direction of light source, and the contrast of light source intensity and color to that of ambient light. In addition, the impact of light on insect behavior varies both qualitatively and quantitatively depending on the light source (lncadescent bulb , light-emitting diode [LED] and CFL bulb, [1,5,12,1519,20,21,22]. Present study suggests that insects prefer Incandescent light bulbs than other light sources .Incandescent bulbs emit greater heat Imperial Journal of Interdisciplinary Research (IJIR) than fluorescent light tubes, and insects prefer the colour of this source.In additition to this they get reasonable heat probably to gain some warmth. Imms 1970 , also supports the fact that heat can attracts insects. .The phenomenon of light attraction towards different source of light may also be governed by the wavelength and frequency of light spectrum and also climatic ecological features of area. Hence Incandescent bulbs are the most insect friendly and better for house and open area use. 5. Conclusion The present study concluded that the insect orders attracted towards the light with a significant dominance for Diptera followed by Hemiptera and Orthoptera. The maximum number of insects were attracted towards Incandescent bulbs followed by CFL and LED bulb 6. Bibliography 1. 2. 3. 4. 5. 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