Effects of different light spectra on the predation of western flower thrips Frankliniella occidentalis by minute pirate bug Orius sauteri
Light supplementary in greenhouses may affect the application efficiency of natural enemies.In order to explore the spectrum of supplementary light on improving the application efficiency of natural enemies and promote the combination of light supplementary and natural enemy release technology,this study compared the differences in predatory ability of Orius sauteri to Frankliniella occidentalis under red(R),blue(B),red and blue combination(RB)and white(W,control)light treatment under the same light intensity and photoperiod.The results showed that compared with W light,B light significantly reduced the survival of female adult O.sauteri,but R and RB light had no effect on the survival of O.sauteri.R and RB light significantly increased the predatory amount of O.sauteri against F.occidentalis under high prey density.The predatory ability of female adult of O.sauteri to female adult of F.occidentalis under different light spectra fitted the Holling Ⅱ functional response model,and the searching efficiency decreased with the increase of prey density.Under RB light,O.sauteri had the best predatory ability on F.occidentalis with the theoretical daily maximum prey consumption number of 43.10 individuals/d,and the shortest handling time of 0.0232 d.At the same time,the theoretical daily maximum prey consumed of B light was 42.90 individuals/d,and the handling time was 0.0233 d.The highest instantaneous attack rate of O.sauteri against F.occidentalis was from R light treatment,of 1.0837.In addition,the searching efficiency of O.sauteri on F.occidentalis was highest under RB light,followed by R or B light,and that was the lowest under W light.These results indicate that compared with W light,R,B and RB light can enhance the predatory functional response and searching efficiency of O.sauteri preying on F.occidentalis,but B light can reduce the survival rate of O.sauteri.Therefore,the combination of R or RB light could potentially improve the predation effect of O.sauteri on F.occidentalis.In this study,we evaluated the effects of three commonly used supplementary light spectra on the predation of O.sauteri on F.occidentalis based on predation differences,providing basic data for the application of supplementary light with natural enemies.
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