光周期对井上蛀果斑螟生长发育及繁殖的影响

Effects of photoperiod on growth,development and fecundity of Assara inouei

为明确不同光周期对井上蛀果斑螟Assara inouei Yamanaka生长发育及繁殖的影响,在25℃,70%RH,光照强度5500 lx及5种不同光周期(L∥D=8 h∥16 h、10 h∥14 h、12 h∥12 h、14 h∥10 h、16 h∥8 h)条件下,研究了井上蛀果斑螟的生长发育和繁殖情况。结果表明,光周期对井上蛀果斑螟幼虫和蛹的发育历期、幼虫存活率、化蛹率、羽化率、成虫寿命、产卵期、平均单雌产卵量有显著影响。在L∥D=16 h∥8 h光周期下幼虫期、蛹期和产卵期最短,分别为18.8、8.2 d和7.8 d;幼虫存活率、化蛹率、羽化率和平均单雌产卵量最高,分别为67.4%、86.5%、93.3%和95.3粒。在L∥D=12 h∥12 h光周期下雌、雄成虫寿命和产卵期最长,分别为15.8、15.1 d和12.5 d,但幼虫存活率最低,为38.9%。光周期对蛹重、成虫产卵前期和卵孵化率无显著影响。除L∥D=16 h∥8 h光周期外,其余4种光周期下井上蛀果斑螟幼虫部分个体出现生长发育停滞现象,滞育率在3.9%~6.9%之间。长光照有利于井上蛀果斑螟的生长发育及繁殖。

To clarify the effects of photoperiod on the development and fecundity of Assara inouei Yamanaka,the study had been conducted to observe the insect development,survival and reproduction at 25℃,70%relative humidity,illumination intensity 5500 lx under five photoperiods(L∥D=8 h∥16 h,10 h∥14 h,12 h∥12 h,14 h∥10 h,16 h∥8 h).The results indicated that the photoperiod had a significant effect on the developmental time,larval survival rate,pupation rate,emergence rate,longevity of adult,oviposition period and number of eggs laid per female.Under L∥D=16 h∥8 h photoperiod,the larval duration,pupal duration,and oviposition period were the shortest,which were 18.8,8.2 d and 7.8 d,respectively,and the survival rate of larvae,pupation rate,emergence rate,and number of eggs laid per female were the highest,which were 67.4%,86.5%,93.3%and 95.3 eggs,respectively.Under L∥D=12 h∥12 h photoperiod,longevity of female and male adults and oviposition period were the longest,which were 15.8,15.1 d and 12.5 d,respectively,but the survival rate of larvae was the lowest,which was 38.9%.The photoperiods had no significant effect on the pupa weight,pre-oviposition period and egg hatching rate of A.inouei.Except for the L∥D=16 h∥8 h photoperiod,some individuals of the larvae showed growth retardation under other four photoperiods,and the diapause rate ranged from 3.9%to 6.9%.Longer photoperiods are favorable for the development and fecundity of A.inouei.