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29 September 2020 Field Efficacies and Joint Actions of Beta-cyfluthrin Mixed With Thiamethoxam or Tolfenpyrad Against Diaphorina citri (Hemiptera: Liviidae)
Tao Tang, Mingping Zhao, Pei Wang, Yi Xiao, Shengkong Huang, Wei Fu
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Abstract

The Asian citrus psyllid, Diaphorina citri Kuwayama, is the most serious pest of citrus because it is a vector for the highly destructive citrus greening disease (huanglongbing, HLB). Currently, insecticide applications are being used widely to control psyllid populations, thereby suppressing the spread of HLB. In the present study, topical application bioassays were performed to detect the joint actions of beta-cyfluthrin and thiamethoxam or tolfenpyrad against D. citri adults in the laboratory. In 2019, a field plot experiment was conducted to evaluate the control efficacies of beta-cyfluthrin+thiamethoxam 22% capsule suspension and beta-cyfluthrin+tolfenpyrad 30% microemulsion against D. citri using foliar sprays. For the former, a 9:13 mass ratio had the highest synergistic effect, with a cotoxicity coefficient of 188.64. For the latter, a 5:25 mass ratio had the highest synergistic effect, with a cotoxicity coefficient of 153.94. A one-time foliar spray of the former at 30–40 mg/kg or of the latter at 40–60 mg/kg effectively controlled D. citri, with control efficacies varying from 80.1 to 99.4% or 80.4 to 100.0%, during the 3–30 d after treatment, respectively. Moreover, field observations indicated that these foliar sprays at the tested rates had no negative effects on citrus trees. Thus, foliar sprays of beta-cyfluthrin+thiamethoxam or beta-cyfluthrin+tolfenpyrad under the given conditions may control D. citri.

© The Author(s) 2020. Published by Oxford University Press on behalf of Entomological Society of America. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.
Tao Tang, Mingping Zhao, Pei Wang, Yi Xiao, Shengkong Huang, and Wei Fu "Field Efficacies and Joint Actions of Beta-cyfluthrin Mixed With Thiamethoxam or Tolfenpyrad Against Diaphorina citri (Hemiptera: Liviidae)," Journal of Economic Entomology 113(6), 2793-2799, (29 September 2020). https://doi.org/10.1093/jee/toaa196
Received: 29 May 2020; Accepted: 3 August 2020; Published: 29 September 2020
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KEYWORDS
beta-cyfluthrin
cotoxicity coefficient
Diaphorina citri
thiamethoxam
tolfenpyrad
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