Visual response effects of western flower thrips manipulated by different light spectr

Abstract

To understand how spectral light wavelength affects thrips visual sensitivity, the selective response and the approach sensitivity of western flower thrips were examined. The results showed that light intensity affected thrips selective sensitivity to different spectra, with good visual sensitivity to blue, ultraviolet (UV), and green light changes to UV, violet, and yellow light when illumination increased from 120 lx to 6000 lx. Red light was the sensitive spectral light driving thrips to respond to sensitive light. Under illumination, the best sensitivity response to spectra was violet, while under light energy, this changed to UV when light energy was increased to 120 mW/cm 2. However, the photo-stimulus properties (illumination or light energy) did not affect the optimal approach sensitivity to UV light. Furthermore, when illumination or light energy stimulated thrips to select two different spectral lights, the total response sensitivity to 12000 lx of UV and violet light were the best (83.27%), while at 60 mW/cm 2 of UV and yellow light was the best (82.15%). But different photo-stimulus properties influenced on the total approach sensitivity to the stimulation of two different spectral lights when the intensity of light increased, showing that to 12000 lx of violet and green light was the best (53.18%), while for 120 mW/cm 2 of UV and green light was the best (47.74%). The thrips visual selection response effects stimulated by illumination were different from that induced by light energy, and originated from the thrips different bio-regulatory effects caused by the intensity of light energy of illumination and the intensity of illumination of light energy. Therefore, different photo-stimulus effects can manipulate thrips visual sensitivity to enhance the phototactic effect.

Influences of yellow and green lights on the visual response of western flower thrips and field verification

“…Research on the color vision mechanism and biological characteristics of thrips has shown that thrips have the strongest response in the wavelength range of 500-600 nm, while sunlight intensity, the shape and size of the chromatogram, the background color of the host, and the hanging height all affect the trapping effect of sticky plates [6][7][8][9] . Matteson et al [10] found that the peak value of the retinal potential of F. occidentalis was 545 nm, while the trapping peak value was 524 nm, and therefore presented the irritability of color tropism within a short distance [11,12] .…”

Light spectra blocking films reduce numbers of western flower thrips, Frankliniella occidentalis (Thysanoptera: Thripidae) in strawberry, Fragaria x ananassa

“…UV is an important cue for take‐off flight of thrips (Mazza et al, 2010); however, it is not clear how the attenuating film in our study affected F. occidentalis behaviour. In addition, light intensity can change the response of thrips to spectral wavelengths, as demonstrated in Liu et al (2019). In our study, potentially constricting the spectral range may reduce flower reflection and hence recognition by the thrips and attraction to flowers, preventing dispersal to new egg‐laying sites, but more research is needed to demonstrate this.…”

“…Spectral balance is important in insect pest navigation, flight orientation, and food sourcing. Thrips (Thysanoptera) generally have a very restricted range of perception within the UVA (300–400), violet‐blue (401–500), and green‐yellow (501–560) spectra compared with other insect orders (Fennell et al, 2019; Liu et al, 2019; Matteson et al, 1992). UV is an important cue for take‐off flight of thrips (Mazza et al, 2010); however, it is not clear how the attenuating film in our study affected F. occidentalis behaviour.…”

Photoreceptive reaction spectrum effect and phototactic activity intensity of locusts’ visual display characteristics stimulated by spectral light

“…In the experiment, the visual characteristic state of locusts stimulated by spectral light generated a spectral response amplitude emitted in the visual system (Figure 3), whereas the reaction specificity of the locust visual system absorbing and selecting different spectral light wavelengths and the differences in visual pigments and structures absorbing, refracting, and scattering different light photons [21][22][23][24][25][26][27][28][29] restricted the visual reaction intensity of the locust visual system absorbing different light energy components continuously. This caused a difference in the time-varying physiological regulation of the visual spectrum amplitude emitted in the visual system and characterized by visual reaction intensity.…”