[Objective] The paper aimed to explore influence of different factors on eggs hatching of Cryptotympana atrata,and optimize technical parameters in practice.[Method] By using hatching rate as index,L16（44）orthogonal...[Objective] The paper aimed to explore influence of different factors on eggs hatching of Cryptotympana atrata,and optimize technical parameters in practice.[Method] By using hatching rate as index,L16（44）orthogonal design was employed to determine the effects of the four factors including temperature,salinity,photoperiod and pH.[Result] Photoperiod had obviously effects on hatchability of Cryptotympana atrata eggs.The optimal conditions for hatching were temperature 30 ℃,salinity 25%,photoperiod L12∶D12,and pH 6.[Conclusion]The research provided some scientific basis for indoor artificial incubation.展开更多
The outbreak of Cryptotympana atrata happened in a certain airport,Zhejiang Province in July 1999.Some airplanes were damaged.The biological habits of this insect,the causes of outbreak were studied.The author also su...The outbreak of Cryptotympana atrata happened in a certain airport,Zhejiang Province in July 1999.Some airplanes were damaged.The biological habits of this insect,the causes of outbreak were studied.The author also suggested some measurements to control C.atrata which including artificial catching,physical control and chemical control.展开更多
The long rib of the sounding membrane in the black cicada is an analog to the beam clamped at one end. The fundamental frequency of activation sound is between 3900-5500 Hz and is basically consistent with the possibl...The long rib of the sounding membrane in the black cicada is an analog to the beam clamped at one end. The fundamental frequency of activation sound is between 3900-5500 Hz and is basically consistent with the possible range of the main peak frequency ( MPF) of song in the black cicada. The operculum (Op), tymbal cover (TC) and joint membrane (JM)are respectively analogous to a unifor square plate clamped at one edge and free at the others, to another plate at two opposite sides and free at the other, and to a rectangular membrane clamped at four sides. The fundamental frequencies of activated vibration are basically consistent with theMPFs and main high frequency components of vibrations of the Op, TC and JM, respectively.The resonant cavity and spiracles on both sides are analogous to a current resonace circuit and to a resistance connected in parallel at the output ends, and the resonant frequency and quality factor of the circuit are in good agreement with the MPF and its tuning sharpness of son the black cicada.展开更多
基金Supported by National Trades(Agriculture)Scientific Research Foundation(200803005)~~
文摘[Objective] The paper aimed to explore influence of different factors on eggs hatching of Cryptotympana atrata,and optimize technical parameters in practice.[Method] By using hatching rate as index,L16（44）orthogonal design was employed to determine the effects of the four factors including temperature,salinity,photoperiod and pH.[Result] Photoperiod had obviously effects on hatchability of Cryptotympana atrata eggs.The optimal conditions for hatching were temperature 30 ℃,salinity 25%,photoperiod L12∶D12,and pH 6.[Conclusion]The research provided some scientific basis for indoor artificial incubation.
文摘The outbreak of Cryptotympana atrata happened in a certain airport,Zhejiang Province in July 1999.Some airplanes were damaged.The biological habits of this insect,the causes of outbreak were studied.The author also suggested some measurements to control C.atrata which including artificial catching,physical control and chemical control.
文摘The long rib of the sounding membrane in the black cicada is an analog to the beam clamped at one end. The fundamental frequency of activation sound is between 3900-5500 Hz and is basically consistent with the possible range of the main peak frequency ( MPF) of song in the black cicada. The operculum (Op), tymbal cover (TC) and joint membrane (JM)are respectively analogous to a unifor square plate clamped at one edge and free at the others, to another plate at two opposite sides and free at the other, and to a rectangular membrane clamped at four sides. The fundamental frequencies of activated vibration are basically consistent with theMPFs and main high frequency components of vibrations of the Op, TC and JM, respectively.The resonant cavity and spiracles on both sides are analogous to a current resonace circuit and to a resistance connected in parallel at the output ends, and the resonant frequency and quality factor of the circuit are in good agreement with the MPF and its tuning sharpness of son the black cicada.
