灰斑古毒蛾的发生规律

Occurrence regularity of Orgyia ericae Germar

灰斑古毒蛾(Orgyia ericae Germar)在鄂尔多斯地区1年发生2代,以卵越冬。5月中旬越冬卵开始孵化,6月中旬开始化蛹,成虫于6月下旬羽化,到10月下旬结束。第2代幼虫始见于8月上旬,结束于9月中旬。第1代和第2代幼虫为害期共约5个月。试验研究表明:相同条件下,雌蛹比雄蛹重;在23℃条件下,雌蛹最重,为(0.59±0.02)g;产卵量受温度影响显著,在23℃时,单雌产卵量最大,为每雌483.25粒。杭锦旗地区灰斑古毒蛾幼虫—蛹期的寄生性天敌平均寄生率达72.2%;卵—茧期的寄生性天敌平均卵寄生率3.23%,平均茧寄生率为61.03%。

Orgyia ericae Germar completes two generations per year in the Ordos areas and lives through the winter with eggs. The eggs were hatched in mid May of the next year, the pupation was occurred in mid June and the adults were main- ly produced form late June until late October. The second generation larva emerges from early August to mid September. Damage duration of two generations was about five months. The experimental results showed that the female pupa was heavi- er than the male in the same conditions and the heaviest female pupa was 0.59 ± 0.02g at 23 ℃. The temperature had a significant effect on the female fecundity. The single-female had greatest eggs at 23℃, about 483.25 eggs. The average parasitic rate of egg-pupa was 72.2%, egg parasitic rate was 3.23% and cocoon parasitic rate was 61.03% in Hangjinqi. Key words： Orgyia ericae Germar; occurrence regularity; life history; parasitoids ; parasitic rate