Study on the Bionomics of Biston robustum and Its Control

Biston robustum has one generation a year in Rongcheng of Shandong Province,overwinters in pupal stage underground.The adults emerge in early April of the following year. The number of copulation for the female moths is only one,while the male moths 1～2 times.Each female lays 1 054～1 072 eggs.The female moths may live 9～11 days and male 7～8 days.The eggs hatching peak is 4～10 days.Eggs duration is 28～46 days.There are 8 larval instars,the time is 112～126 days.Feeding amount of each larva is 440.6～483.2 cm2.Pupal period is 232～249 days.Their predators are Hierodula patellifera,Calosoma maderae chinense,Arma custos,Misumenops tricuspidatus,Clubiona japonicola,Oxyopes sertatus. The parasitoid complexs are Meteorus pulchricornis,Exorista sorbillans. It is proved that the larvae were killed about 97.5% by 2.5 deltamethrin,20% fenvalerate(1:6 000, V/V),50% monocrotophos(1∶1 500, V/V),80% dichlorvos and 90% tricholorphon(1∶1 000, V/V).