Effects of chlorantraniliprole on development and reproduction of beet armyworm, Spodoptera exigua (Hübner)

Abstract

The lethal and sublethal effects of chlorantraniliprole against Spodoptera exigua (Hübner) were evaluated under laboratory conditions by oral exposure of neonate larvae to the compound. The 72 h LC 50 value of this insecticide to S. exigua was found to be 12.747 lg l -1 . A progressive larval mortality of 24.32% for LC 30 treatment and 42.61% for LC 50 treatment was observed from 4th to 6th day after exposure, which resulted in the reduced pupation rates in exposure groups. The sublethal effects of this chemical were indicated by prolongation of larval period, the increase of pupal weight and decrease in hatch rate of egg. Chlorantraniliprole at LC 30 and LC 50 rate significantly delayed larval development; the developmental duration of surviving larvae was extended for 22.5 and 28.6%, respectively, compared with that of control group. LC 30 treatment increased the mean weight of pupa and induced to the production of heavier pupa ([150 mg). In LC 50 treatment, heavier pupa also showed up but the mean weight of pupa was not influenced. The egg hatch rate in LC 50 group was significant lower than that in control and LC 30 groups. No significant differences in pupal duration, emergence rate, sex ratio, egg number per female, and longevity of adults were observed among treatments. Chlorantraniliprole had exceptional activity against S. exigua according to concentration-response bioassay in laboratory, and the toxicities were primarily resulted from immediate lethality.

Effects of cyantraniliprole, a novel anthranilic diamide insecticide, against Asian citrus psyllid under laboratory and field conditions

“…Further sublethal effects of cyantraniliprole on D. citri included reduced egg deposition, egg hatch and adult emergence. Anthranilic diamides have caused similar effects in other insects investigated to date . In addition to being highly toxic to neonate larvae of Spodoptera exigua and Lobesia botrana , chlorantraniliprole caused more than 20% egg mortality in L. botrana .…”

“…Cyantraniliprole is currently not yet registered for application in certain fruit crops or vegetables in the United States; however, such registrations are pending. The first‐generation anthranilic diamide insecticide chlorantraniliprole has shown promising results in the management of lepidopteran, hemipteran and coleopteran pests …”

Lethal and sublethal effects of cyantraniliprole onBactrocera dorsalis(Hendel) (Diptera: Tephritidae)

“…These results are similar to those obtained by Teixeira et al ., who evaluated chlorantraniliprole on three species of Rhagoletis fruit flies. However, chlorantraniliprole does have a significant negative impact on egg laying and egg hatching in Lepidoptera . The phenomenon whereby different species of insects exhibit adverse effects on the same behaviours/physiological factors when treated with the same kind of insecticide is not rare .…”

Sublethal effects of chlorantraniliprole on juvenile hormone levels and mRNA expression of JHAMT and FPPS genes in the rice stem borer, Chilo suppressalis

“…It not only shows high insecticidal activity against lepidopteran insects but also exhibits adverse sublethal effects on insect fitness. For example, chlorantraniliprole at LC 30 and LC 50 concentrations significantly extended Spodoptera exigua larval duration by 22.5% and 28.6%, respectively, compared with the control group . In Plutella xylostella , sublethal effects of chlorantraniliprole were indicated by reduced pupation rates, pupal weight and adult emergence rates as well as decreased fecundity .…”