首页|Monitoring of Diaphorina citri populations from Florida reveals reduced susceptibility to cyantraniliprole and thiamethoxam
Monitoring of Diaphorina citri populations from Florida reveals reduced susceptibility to cyantraniliprole and thiamethoxam
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NSTL
Wiley
Abstract The Asian citrus psyllid, Diaphorina citri, is an important pest that transmits the causal pathogens of huanglongbing (HLB) in citrus. In Florida, HLB threatens citrus production and insecticide overuse for the vector has resulted in evolution of resistance among populations of D.?citri to commonly used insecticides. Cyantraniliprole is effective against nymphal and adult D.?citri. However, since the introduction of cyantraniliprole use in Florida, observations have suggested that duration of population suppression following foliar sprays against D.?citri has decreased from 60 to 28?days during the period between 2012 and 2020. Here, we sampled populations of D.?citri from four locations in FL and measured their susceptibility to four insecticides compared with a susceptible laboratory culture. A vial bioassay method was used to measure direct toxicity of insecticides to D.?citri. For bifenthrin, cyantraniliprole, dimethoate and thiamethoxam, the resistance ratios of field populations were 6.67–11.33, 3.20–36.37, 12.50–82.50 and 4.60–10.08, respectively. Data suggested that susceptibility levels of D.?citri populations to cyantraniliprole have decreased over 10‐fold at three separate citrus growing locations in Florida. Although some shifts in the resistance ratio of cyantraniliprole appear to have occurred since its use began in FL citrus, the resistance ratios are congruent with field observations indicating that D.?citri should remain susceptible to label rate applications of this mode of action without control failure. However, our results indicate that sufficient field variation in susceptibility to cyantraniliprole exists among populations of D.?citri to justify careful management of this insecticide for prevention of insecticide resistance development.
NSTL
Wiley
