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.

中文翻译：

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β-氟氯氰菊酯与噻虫嗪或托芬吡菌混用对柑橘木虱（半翅目：蜂科）的田间功效和联合作用

亚洲柑橘木虱Diaphorina citri Kuwayama 是柑橘最严重的害虫，因为它是高度破坏性柑橘绿化病（黄龙病，HLB）的载体。目前，杀虫剂应用正被广泛用于控制木虱种群，从而抑制 HLB 的传播。在本研究中，在实验室中进行了局部应用生物测定，以检测 β-氟氯氰菊酯和噻虫嗪或托芬吡酯对柑橘 D. citri 成虫的联合作用。2019年开展田间小区试验，评价β-氟氯氰菊酯+噻虫嗪22%胶囊混悬液和β-氟氯氰菊酯+甲苯吡菌胺30%微乳叶面喷施对柑橘叶螨的防治效果。对于前者，质量比为 9:13 的协同效应最高，共毒系数为 188.64。对于后者，5：25质量比协同作用最高，共毒系数为153.94。前者30-40mg/kg或后者40-60mg/kg一次性叶面喷施有效控制了柑橘假单胞菌，防治效果从80.1%到99.4%或80.4%到100.0%不等。分别治疗后3-30 d。此外，田间观察表明，这些叶面喷洒以测试的比率对柑橘树没有负面影响。因此，在给定条件下叶面喷洒 β-氟氯氰菊酯 + 噻虫嗪或 β-氟氯氰菊酯 + 吡虫啉可以控制柑橘 D.。分别于治疗后 3-30 d。此外，田间观察表明，这些叶面喷洒以测试的比率对柑橘树没有负面影响。因此，在给定条件下叶面喷洒 β-氟氯氰菊酯 + 噻虫嗪或 β-氟氯氰菊酯 + 吡虫啉可以控制柑橘 D.。分别于治疗后 3-30 d。此外，田间观察表明，这些叶面喷洒以测试的比率对柑橘树没有负面影响。因此，在给定条件下叶面喷洒 β-氟氯氰菊酯 + 噻虫嗪或 β-氟氯氰菊酯 + 吡虫啉可以控制柑橘 D.。