| Along with people’s demand for the quality of agricultural products becoming higher and higher, the technology of light traps provides a new method of pest control. But there are some weaknesses on light traps. In order to better use this technology, it needs to be more perfect. In aquatic vegetables lotus field, by means of light traps, this research study insect species and the occurrence of main pests and dynamic, determine trap effect of the different light source on the field of the main pests, study lamp rhythm of main insect pests, advantaged neutral insect and natural enemy insects. To provide scientific basis for the light traps technology on main pests of lotus field. The results of the study are as follows:1 The species and composition of insect caught by light trap in the lotus field128 species in 10 orders were caught by the light traps, including Lepidopterans, Coleopterans, Orthopterans, Hemipterans, Homopterans, Dipterans, Odonatas, Neuropteran, and Hymenopterans. Among them, Lepidopterans accounted for 54.33%, Coleopterans accounted for 12.60%, Odonatas accounted for 8.66%, Hemipterans 7.87%,Orthopterans accounted for 5.51%, Dipterans accounted for 4.72%, Hymenopterans accounted for 2.36%, Homopterans accounted for 1.57%, Mantodea accounted for 1.57% and Neuropteran accounted for 0.79%. 8 kinds main pests including: Prodenia litura, Latoia pastoralis, Hymenia recurvalis, Chrysochus chinensis, Donacia provosti, Spodoptera exigua, Spodoptera mauritia, Agrius convolvuli. 8 kinds natural enemies including: Staphylinidae, Propylea japonica, Staphilinidae, Sirthenea flavipes, Chlaenius micans, Hyperaspis repensis, Harmonia axyridis and Adalia bipunctata. 10 kinds of advantaged neutral insects including: Physopelta cincticollis, Gryllus chinensis, Lonicera japonica, Musca domestica, Oxya velox, Scotinophara lurida, Plautia fimbriata, Oedaleus infernalis, Euprepocnemis shiraki, Eretes sticticus.2 The occurrence dynamics of main pestsMain pests occurrence peak are mainly distributed in the middle of mid to late July and August and the end of August- beginning of September. Peak occurred in late August, early September the most(54.55%) of pests, followed by mid to late July(27.27%), there are a few insects(18.18%) in the middle of August. So the end of August to early September is the height of the hazard, is also the most critical period of pest control.3 luring effect of different light sources on the field of the main pestsThe advantage of light traps in lotus field of main pests light focused on the No.2 light, No.4 light, and No.19 light. Lamp advantage source scaled, No.4 light(44.44%) is better than that of No.19 light(33.33%). No.19 light is better than that of No.2 light(22.22%). So No.4 light in the lotus field luring effect is the best of all light sources. With No.4 light as light source, light traps can get the best pest control effect.4 Lamp rhythm of main insect pests, advantaged neutral insect and natural enemy insectsLamp peak of main pests in lotus field are mainly distributed in 20:00—22:00, 22:00—24:00 and 2:00—4:00. In regard to insect quantity, 22:00—22:00 and 2:00—4:00 is the most efficient time of trapping major pest. Lamp peak of natural enemy insects are mainly distributed in 20:00—22:00 and 22:00—24:00, In regard to insect quantity, 20:00 —22:00 is one of the biggest impact on the natural enemy insects. Advantaged neutral insects lamp peak were 20:00—22:00 and 22:00—24:00, In regard to insect quantity, 22:00—24:00 is influential periods of neutral insects. Summary of view, during the main pest lamp peak at the same time avoiding the insect natural enemies and neutral insects lamp peak(2:00—4:00) is the best time to turn on the light traps. |
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