chlorantranilipole and chlorfluazuron

The cotton leafworm, Spodoptera littoralis (Lepidoptera: Noctuidae) is the most destructive pests and causing a great loss for several vegetables and field crops. So, the present study was aimed to evaluate and compare the effects of chlorantraniliprole and chlorfluazuron on certain behavioral and biological aspects of S. littoralis at different stages.. Under laboratory conditions, the toxicity of chlorantraniliprole and chlorfluazuron against the egg masses, 2nd and 4th larval instars of S. littoralis were evaluated. The impact of tested insecticides on the feeding, oviposition of females and biological aspects of S. littoralis was also carried out.. Overall, chlorfluazuron was more toxic than chlorantraniliprole. According to repellency index (RI %), tested insecticides have a repulsive effect for the feeding of 2nd and 4th larval instars as well as for oviposition of females. Sublethal concentrations significantly reduced larval and pupal weight, adult survival, percent of pupation and adult emergence, female fecundity, fertility percentage, weight and protein content of ovaries. While, larval and pupal durations were increased.. It was concluded that chlorantraniliprole and chlorfluazuron have insecticidal, behavioral and biological effects on S. littoralis stages and may be used as alternatives to conventional insecticides in IPM programs.

Topics: Animals; Behavior, Animal; Dose-Response Relationship, Drug; Female; Insecticides; Larva; ortho-Aminobenzoates; Ovary; Oviposition; Phenylurea Compounds; Pupa; Pyridines; Spodoptera

The diamondback moth (DBM), Plutella xylostella (L.) (Lepidoptera: Plutellidae), is a globally distributed and important economic pest. Chemical control is the primary approach to regulate populations of this pest. However, resistance to insecticides evolves following heavy and frequent use. Therefore, the insecticide resistance in field populations of P. xylostella collected from Central China from 2013 to 2014 was determined with a leaf-dipping method. Based on the results of the monitoring, P. xylostella has developed high levels of resistance to beta-cypermethrin (resistance ratio=69.76-335.76-fold), Bt (WG-001) (RR=35.43-167.36), and chlorfluazuron (RR=13.60-104.95) and medium levels of resistance to chlorantraniliprole (RR=1.19-14.26), chlorfenapyr (RR=4.22-13.44), spinosad (RR=5.89-21.45), indoxacarb (RR=4.01-34.45), and abamectin (RR=23.88-95.15). By contrast, the field populations of P. xylostella remained susceptible to or developed low levels of resistance to diafenthiuron (RR=1.61-8.05), spinetoram (RR=0.88-2.35), and cyantraniliprole (RR=0.4-2.15). Moreover, the LC50 values of field populations of P. xylostella were highly positively correlated between chlorantraniliprole and cyantraniliprole (r=0.88, P=0.045), chlorantraniliprole and spinosad (r=0.66, P=0.039), spinosad and diafenthiuron (r=0.57, P=0.0060), and chlorfenapyr and diafenthiuron (r=0.51, P=0.016). Additionally, the activities of detoxification enzymes in field populations of P. xylostella were significantly positively correlated with the log LC50 values of chlorantraniliprole and spinosad. The results of this study provide an important base for developing effective and successful strategies to manage insecticide resistance in P. xylostella.

Topics: Animals; Bacillus thuringiensis; China; Drug Combinations; Insecticide Resistance; Insecticides; Ivermectin; Macrolides; Moths; ortho-Aminobenzoates; Oxazines; Phenylthiourea; Phenylurea Compounds; Pyrazoles; Pyrethrins; Pyridines