Cycloxaprid: a novel cis-nitromethylene neonicotinoid insecticide to control Bemisia tabaci

Bemisia tabaci is a worldwide insect pest with high ability to develop resistance to many insecticides. Cycloxaprid is a novel cis-configuration neonicotinoid insecticide that is effective against a wide range of imidacloprid-resistant pests.

The lethal and sublethal effects of cycloxaprid on B. tabaci B were estimated. Cycloxaprid showed higher toxicity against adult, nymph and egg of B. tabaci B than imidacloprid. And cycloxaprid provided better efficacies against B. tabaci than imidacloprid in fields. Moreover, cycloxaprid was similarly toxic to the relatively susceptible and imidacloprid-resistant populations. The LC₅₀ of cycloxaprid against the resistant adult, nymph and egg were 6.2, 11.5 and 111.3 mg L^-1 , respectively, while they were 5.7, 8.9 and 129.4 mg L^-1 for the susceptible population. In addition, when resistant adult of B. tabaci B was treated with LC₃₀ of cycloxaprid (3.2 mg L^-1 ), the net reproductive rate and female ratio of F1 generation B. tabaci were reduced. Moreover, the age-specific fecundity demonstrated the highest fecundity sharply decreased in cycloxaprid (7.0 offspring/ day) treated group compared with the control (26.0 offspring/ day).

Our results indicated that cycloxaprid is a promising insecticide for the management of B. tabaci and insecticide-induced resurgence might not occur after exposure of B. tabaci to low sublethal concentrations of cycloxaprid. © 2019 Society of Chemical Industry.