临夏地区异色瓢虫生物学特性观察

Observation on Biological Characteristics of Harmonia axyridis in Linxia

异色瓢虫在临夏地区1年发生4代,幼虫共4龄,越冬成虫4月上旬始见,成虫交尾时长为80～160min,交尾后3～5 d开始产卵,在(20±2)℃的室温下饲喂表明:越冬雌虫产卵量(133.40±33.78)粒/头,孵化率98.91%±1.49%;第1代发育历期:卵期(3.03±0.04)d,1龄幼虫(2.06±0.94)d,2龄幼虫(3.27±0.78)d,3龄幼虫(1.82±0.84)d,4龄幼虫(6.50±7.10)d,蛹期(6.80±0.84)d,成虫平均寿命为(19.67±10.34)d,全世代历期43.15 d。10月下旬以成虫越冬。

Harrnonia axyridis had four generation a year in Linxia, the larvae had 4 instars, winter adults appeared in early April, the adults mating lasted 80-160 minutes copulation after 3-5 days and began to lay eggs, when they were fed under the room temperature of （20 ± 2）℃. It showed that fecundity of overwintering female was （133.40 ± 33.78） eggs/times, the hatching rate was 98.19% ± 1.49%, the first generation development duration： egg stage was （3.03 ±0.04） days, a larvae （2.06 ± 0.94） days, 2 larvae （3.27 ± 0.78） days, 3 larvae （1.82 ±0.84） days, 4 larvae （6.50 ±7.10） days, pupal stage was （6.80 ±0.84） days, average life was（19.67± 10.34） days, the entire generation lasted 43.15 days. It overwintered as adult in late October.