Uptake of soil-applied thiamethoxam in orange and its effect against Asian citrus psyllid in different seasons
Uptake of soil-applied thiamethoxam in orange and its effect against Asian citrus psyllid in different seasons
复制标题
不同季节土施噻虫嗪在柑橘中的吸收及其对亚洲柑橘木虱的作用
DOI：
10.1002/ps.5248
复制
发表时间：
2019-05-01
影响因子：
4.1
通讯作者：
Zhang, Ning
中科院分区：
文献类型：
--
作者：
Hu, Wei;Kuang, Fan;Zhang, Ning
背景
柑橘木虱Diaphorina citri Kuwayama是柑橘的重要害虫，它传播黄龙病病原菌。研究了土壤中噻虫嗪两种施用量在两个冲洗季节对农田非加太种群的影响和持效性。同时检测了该水果中噻虫嗪和噻虫胺的残留量，以评价其食品安全性。
结果
土壤施用50%噻虫嗪水分散粒剂的浓度为4和10克树-1显着降低ACP人口，并有控制效果和噻虫嗪和噻虫胺在叶片中的持久性之间呈正相关，提供更长期的保护长达90天，在秋季相比，在春季60天。新叶中噻虫嗪和噻虫胺的含量高于老叶。噻虫嗪和噻虫胺在水果中的残留率高，分别为0.012和0.010毫克kg-1，在收获，无论是杀虫剂在低利率检测。
结论
这些结果表明，土壤施用噻虫嗪在防御ACP方面发挥作用，并提供了延长的防治效果。这一认识可为土壤施用噻虫嗪减少HLB值扩散控制ACP提供参考。© 2018化学工业协会。
BACKGROUND
Asian citrus psyllid (ACP), Diaphorina citri Kuwayama, is an important pest of citrus worldwide because it transmits the bacteria causing huanglongbing (HLB). We investigated the effects and persistence of two soil application rates of thiamethoxam on ACP populations in two flushing seasons in the field. Thiamethoxam and clothianidin residues in the fruit were detected to evaluate food safety.
RESULTS
Soil application of 50% thiamethoxam water-dispersible granules at concentrations of 4 and 10 g tree-1 significantly decreased ACP populations, and there was a positive correlation between control efficacy and the persistence of thiamethoxam and clothianidin in leaves, providing longer-term protection for up to 90 days in the fall compared with 60 days in the spring. Higher thiamethoxam and clothianidin amounts were observed in new leaves than in old leaves. Thiamethoxam and clothianidin residues at a high rate in fruit were 0.012 and 0.010 mg kg-1 at harvest, respectively, and neither insecticides was detectable at low rates.
CONCLUSIONS
These results demonstrate that soil-applied thiamethoxam plays a role in defending ACP, and provides an extended period of control efficacy. This knowledge could provide a reference for the control of ACP by soil application of thiamethoxam to reduce HLB spread. © 2018 Society of Chemical Industry.