共振声波技术防治柑桔大实蝇的可行性试验研究

运用大型模拟仿真软件ANSYS计算出柑桔大实蝇的固有频率约为55 Hz,对比研究共振声波对柑桔大实蝇行为效应和寿命影响,探讨共振声波技术防治柑桔大实蝇的可行性.1)采用声强120 dB,频率分别为55、100、180和300 Hz的声波分别辐照30 min,记录柑桔大实蝇的行为反应.结果表明:经低频声波辐照,柑桔大实蝇会产生不适反应,如头部不停摇晃,双翅快速摆动,并伴有肢体不停摩擦头部和尾部,趋向于活动在声强低的区域等.共振声波辐照下,柑桔大实蝇具有显著的趋避反应,有效趋避率达36.48％.2)采用频率55 Hz,声强分别为120、110、100、90和80 dB的声波分别辐照30 min,记录柑桔大实蝇的行为反应.结果表明:声强越大,柑桔大实蝇的趋避反应越明显,但声强低于80 dB时,无显著趋避反应.3)采用频率55 Hz,声强为120 dB的声波每次辐照4h,连续辐照直到全部死亡为止,记录柑桔大实蝇的死亡情况.结果表明:高强度共振声波对柑桔大实蝇的寿命具有显著的影响,辐照5d后实验组全部死亡,与对照组比较,最终死亡率提升42.80％.

Experimental study on feasibility of prevention of Tetradacus citri Chen through resonating acoustic technique

A reasonable value of 55 Hz for the natural frequency of Tetradacus citri Chen was obtained by using ANSYS,a large simulation software.A comparative study on the effects of resonating acoustic wave on behavior and lifespan of Tetradacus citri Chen was conducted in this paper,in order to verify the feasibility of prevention of Tetradacus citri Chen through resonating acoustic technique.The response of Tetradacus citri Chen were recorded and tested when they were exposed to a sound field with sound intensity of 120 dB and frequencies of 55,100,180 and 300 Hz for 30 minutes.The results showed that under low frequency acoustic conditions,the Tetradacus citri Chen performed discomfort reactions,such as head shaking,wings flapping,head and tail rubbing by their limbs,and moving to the areas of low sound intensity in the flask;while,under the resonating acoustic wave,Tetradacus citri Chen had a strong response of avoidance,and the effectively escaping rate was up to 36.48%.When Tetradacus citri Chen was exposed to a sound field with frequency of 55 Hz and sound intensities of 120,110,100,90 and 80 dB for 30 minutes,it found that the higher the sound intensity was,the more significant the avoidance;while,if the sound intensity was lower than 80 dB,there was no significant avoidance.The death statuses of Tetradacus citri Chen were investigated with exposure to a sound field of 55 Hz and 120 dB for 4 hours every day until all were killed.The results showed that resonating acoustic wave of high intensity have a significant impact on the lifespan of Tetradacus citri Chen and all the insects used in the experiments were killed after 5 days,comparing with the controls the final mortality increased by 42.80%.