| Western flower thrips, Frankliniella occidentalis (Thysanoptera), is a serious worldwide pest on vegetables, flowers and other crop, but also spread rapidly in recent years, growing seriously hamful as a main alien invasive pest in China;.Orius sauteri ( Anthocoridae ) ( Orius), the predator of thrips, aphids, whiteflies, mites and other small insects and eggs of Lepidoptera pests , is a important natural control force of agro-forest ecosystem in China currently. This article is based on the Insect pest-natural enemy relationship, using behavior, histoanatomy method to study both phototactic behavior, morphology and ultrastructure of compound eye were studied, and the influencing factors of the similarities and differences and the causes were discussed in order to reveal the structural basis and action mechanism of eye's vision, and provide a basis for better protection and utilization of natural enemies to prevent and control pests. The main results are as follows:1. The morphology and microstrcture of comopund eye of Frankliniella occidentalis The western flower thrips compound eyes located on both sides of the head, a single eye consists of about 70 small ommatidia, the surface having more than 10 thorn shape sensory hair. Compound eye is divided into a dorsal, ventral region in two, wherein the back area is arranged in the hemisphere, abdominal area is arranged into a triangle.The small eye of the adult compound eyes the cornea, crystalline cone, rod, and the basement membraneThe ommatidium of adult compouned eye was comprised of corneal, cone; rhabdom and basement membrane.Around the crystalline cone and rhabdom distributed a lot of pigment granules. Considered from the structure, the compound eye belongs to an apposition eye.2. The morphology, microstrcture and ultrastructrue of comopund eye of Orius sauteri The compound eye of Orius sauteri is located on both sides of the head and near the ventral, the facet of male and female adultswere 230 and 210 respectively, approximately hemispherical, sensory hairs ca. 30 root. The diameter of female compound eye is about 153.85μm, height about 70.85μm; in the back view, closest distance of two eye was about 168.54μm, ventral view about 136.84μm. The male eye diameter is about 144.74μm, high about 60.72μm; looks from the back, two eye has a distance of about 166.67μm, and on the ventral of about 102.56μm.The adult eye eyes were comprised of corneal, cone, rhabdom and membrane. Corneal is composed by the multi-layer sheet fiber, present a convex lens structure as slightly convex in external and semicircular in internal, thickness of about 9.41μm; cone is colorless and transparent, shaped a circular truncated cone, the length is about 13.33μm, the distal end has a diameter of 8.33μm, the proximal end of 4.44μm; the rhabdom is about 33.33μm in length; base membrane shaped palisade, thickness of about 0.27μm. Orius sauteri adjust the imaging by microvilli shape and direction in different light intensity level is a typical apposition eye.3. The spectral and light intensity of behavior response of Frankliniella occidentalis Under the 14 Monochromatic Wavelengths within the 340 nm -605 nm spectrum, in the female, phototactic behavior response rates were higher in the monochromatic light green ( 498 nm, 524 nm ), ultraviolet ( 380 nm ) and blue light district ( 440 nm ), photophobic behavior response rates were higher in the spectrum of blue light district (440 nm ), ultraviolet (340 nm ) and orange light ( 582 nm ); in male ,phototactic behavior response rates were higher in the monochromatic light is green ( 498 nm ) and ultraviolet ( 380 nm ), photophobic behavior response rates were higher in the monochromatic light with blue zone ( 440 nm ), ultraviolet ( 340 nm and 360 nm ); spectral behavior reaction has certain difference between the sex, the female has more sensitive spectrum, but spectral sensitive strength is slightly worse, while the male has lesssensitive spectral relatively but better light sensitive intensity.In Log 4.5-Log 0.0 light intensity range, in stimulation of different light intensity of monochromatic light or white light ,the phototaxis behavior response rate has a big difference between female and male adult, phototaxis behavior response rate on the whole with the increasing light intensity; light avoidance behavior reaction rate also has a certain influence, but the effect is small; gender on light intensity of behavioral responses to have certain effect, but the effect is relatively small.4. The spectral and light intensity of behavior response of Orius sauteri In the 14 monochromatic wavelength spectrum within the 340 nm -605 nm, the phototactic behavior response rates were higher in the monochromatic light with ultraviolet ( 340 nm, 360 nm and 380 nm ), green ( 524 nm ) and orange red light district ( 583 nm, 605 nm ); male phototactic behavior response rates were higher in the monochromatic light ultraviolet region ( 340 nm, 360 nm and 380 nm ), red light ( 605 nm) and green ( 524 nm ); spectral behavior of reaction between the sexes have certain difference, the female has more sensitive spectrums, and the strength of sensitive spectrum is better than male.In Log 4.5-Log 0.0 light intensity range, in stimulation of white light in different light intensity , female, male adult phototaxis behavior response rate has significant changes, in log 4.5-log 1.5 intensity,in female, with the intensity enhancement the phototactic response rate varied little .in the log 1.0-Log 0.0 intensity, with the intensity enhancement the phototactic reaction rate increases rapidly. The phototactic behavior response rate of male increases with light intensity enhancement on the whole; the light avoidance behavior response rate has some effect with light intensity enhancement , but the effect is small; sex of Orius sauteri have certain effect on light intensity of behavioral responses, but the effect is relatively small.5. Hasten color behavior of Frankliniella occidentalisThe western flower thrips have some taxis with the green, yellow and blue. In feeding and non-feeding conditions, western flower thrips trend rate are affected of different color background , but little effect; at the same time, comparing each two color environment, different color trend rate have certain difference, but the difference is not significant.The innovation of this paper is to focus on the pest-natural enemy two trophic relationships, systematically studies and analyzes the pest, natural enemy, two functional group in the representation of the category - western flower thrips and Orius sauteri of their compound eye structure, physiological mechanism of light, color behavior and similarities, differences and the causes, to reveal the inherent essence and biological significance of the color, light visual information in compound eye structure, behavior and other aspects between them , providing scientific basis for the lighting and optical activity measurement and trap and kill technical for practice use. At the same time, initially revealed the physiological mechanism and causes of Orius sauteri and western flower thrips' photoreception and phototactic behavior at the cellular and population levels.
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