颜色对梨小食心虫产卵选择性的影响

梨小食心虫(Grapholitha molesta Busck)是一种重要的果树害虫,早春产卵喜在桃嫩梢叶上,为探明寄主颜色在其产卵选择中的作用,利用彩色卡纸模拟寄主颜色,室内比较了红、粉红、浅粉、橙黄、深黄、浅黄、青绿、深绿、浅绿、蓝、紫、褐色等12种不同颜色基质对其成虫产卵选择性的影响。结果发现:基质颜色对梨小食心虫的产卵选择性有显著影响,其产卵偏嗜浅黄和浅绿色,白色和黑色参比时其产卵选择率分别依次为68.9%、63.8%和64.1%、65.5%,蓝和浅粉色则表现一定的拒避作用,白色和黑色参比时其产卵选择率分别依次为47.7%、40.4%和47.2%、42.7%,且参比色对其产卵选择性影响差异显著。基质颜色对其产卵量亦有显著性影响,无论黑或白色参比,黄、绿颜色上的产卵量均较多,尤其是深黄、深绿和青绿色。基质颜色对1—7日龄梨小食心虫成虫的产卵选择性均有显著影响。白色参比时,2、3日龄蛾对浅绿和浅黄色的产卵选择率显著高于其他颜色;黑色参比时,2日龄时明显偏嗜浅绿色(79.7%),6日龄时明显偏嗜浅黄色(74.8%)。表明寄主颜色在梨小食心虫产卵场所选择中具有重要作用,为其卵期监测和防控中颜色应用乃至进一步揭示其产卵寄主选择机理提供了依据和参考。

Effect of colours on oviposition preference of the oriental fruit moth, Grapholita molesta Busck

Abstract: Grapholita molesta Busck is one of the major fruit tree pests insects which lay their eggs prefer spawning on the leaves of peach young shoots. In order to find out the roles of the host colour in the orientation in oviposition of G.molesta Busck, Has comparative study the effect of 12 different colours ( red, pink, light pink, orange yellow, deep yellow, light yellow, green, deep green, light green, blue, purple, brown etc) on oviposition selectivity of adult using the color cardboard to simulation host colour in indoors. The results showed that colour can effect the G.molesta Busck oviposition selectivity significantly. Oviposition prefer the light yellow and light green,the oviposition selectivity of light yellow was 68.9% and 63.8% in white and black reference,while light green was 64.1% and 65.5%. blue and light pink shown a certain avoid function, the oviposition selectivity of blue was 47.7% and 40.4%,whlie light pink was 47.2% and 42.7%, and the referance colours can significantly impact the oviposition selectivity. Colour can effect the fecundity of G.molesta Busck significantly, whether the while or black referance, the eggs spawing on yellow and green colour are much more than others, especially the deep yellow, deep green and green. Colour could even significantly impact the oviposition selectivity of 1-7 days adults, the oviposition selectivity of light yellow and light green of 2 and 3 days moth were significantly higher than other days on white reference, especially 2 day, which oviposition selectivity was as high as 86.7% and 91.7%; On black reference, 2 day moth obvious prefered light green that oviposition selectivity was 79.7%,while 6 day moth obvious prefered light yellow that oviposition selectivity was 74.8%. The study showed that host colours play an important role in the choice of spawning ground of G.molesta Busck and provide basis and reference for the application of colour in its egg stage monitoring and prevention and control and for further uncovering the spawning host selection mechanism.