Influence of Tree Size and Application Rate on Expression of Thiamethoxam in Citrus and Its Efficacy Against Diaphorina citri (Hemiptera: Liviidae)

Journal of Economic Entomology
Kevin W LangdonMichael E Rogers

Abstract

Neonicotinoids are a key group of insecticides used to manage Diaphorina citri Kuwayama (Hemiptera: Liviidae), in Florida citrus. Diaphorina citri is the vector of Candidatus Liberibacter asiaticus, the presumed causal agent of huanglongbing, a worldwide disease of citrus. A two-season field study was conducted to evaluate the effect of tree size and application rate on the expression of thiamethoxam in young citrus following application to the soil. D. citri adult and nymph abundance was also correlated with thiamethoxam titer in leaves. Tree size and application rate each significantly affected thiamethoxam titer in leaf tissue. The highest mean thiamethoxam titer observed (33.39 ppm) in small trees (mean canopy volume = 0.08 m3) occurred after application of the high rate (0.74 g Platinum 75SG per tree) tested. There was a negative correlation between both nymph and adult abundance with increasing thiamethoxam titer in leaves. A concentration of 64.63 ppm thiamethoxam was required to reach a 1% probability of encountering a flush shoot with at least one adult D. citri, while 19.05 ppm was required for the same probability of encountering nymphs. The LC90 for the field population was 7.62 ppm thiamethoxam when administered th...Continue Reading

References

Jun 19, 2008·Pest Management Science·Alfred ElbertRalf Nauen
May 12, 2009·Pest Management Science·Dhana Raj BoinaLukasz L Stelinski
Nov 11, 2010·Journal of Economic Entomology·K S Pelz-StelinskiM E Rogers
May 4, 2011·Pest Management Science·Siddharth TiwariLukasz L Stelinski
Nov 20, 2012·Journal of Economic Entomology·R H SerikawaM E Rogers
Jan 16, 2013·Annual Review of Entomology·Elizabeth E Grafton-CardwellPhilip A Stansly
Dec 29, 2015·Journal of Economic Entomology·Lambert H B KangaPhilip Stansly
Sep 30, 2017·Journal of Economic Entomology·Kevin W Langdon, Michael E Rogers

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