Abstract:
【Objective】 To study the effects of sublethal doses cyantraniliprole on the development and reproduction of
Spodoptera litura in parental and F
1 generations.【Method】 The sublethal doses including both LC
20 and LC
40 were estimated by the leaf-dipping method and the sublethal effects were investigated in parental and F
1 generations under laboratory conditions.【Result and conclusion】 When the 3rd instar
S. litura larvae were exposed to LC
20 and LC
40 of cyantraniliprole on an arum leave,
Colocasia esculenta (L.) Schott for 72 h, the larvae duration from 3rd instar to 6th instar period increased by 2.39 and 4.32 d respectively, and the pupation rate (78.67%, 60.33%) and emergence rate (72.12%, 61.28%) were significantly lower than those of the control groups. Meanwhile, both the male and female pupal mass increased. Compared to the control groups, the laid eggs per female and the hatched rate significantly reduced in the LC
40 group, but those did not occur in the LC
20 group. No significant differences in pupal duration, sex ratio, and longevity of adults were observed in the treatment exposed to LC
20 or LC
40 dosages. The parent
S. litura exposed to LC
20 and LC
40 doses of cyantraniliprole also extended the development duration in F
1 generation larvae and reduced the pupation rate, with no significant influence on the emergence rate and the laying eggs per female. These results provide the theoretical basis for developing integrated pest management program for
S. litura and the rational use of cyantraniliprole.