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Do organic silicon and imidacloprid synergistically induce toxicity to the new invasive mealybug Phenacoccus solenopsis Tinsley on Portulaca grandiflora plants?

文献类型: 外文期刊

作者: Huang, Jun 1 ; Zhang, Juan 1 ; Wang, Daoze 2 ; Zhang, Lili 2 ; Xu, Yijuan 3 ; Li, Mingjiang 1 ;

作者机构: 1.Zhejiang Acad Agr Sci, Flower Res & Dev Ctr, Hangzhou, Zhejiang, Peoples R China

2.Plant Protect & Soil Fertilizer Hangzhou Gen Stn, Hangzhou, Zhejiang, Peoples R China

3.South China Agr Univ, Red Imported Fire Ant Res Ctr, Guangzhou, Guangdong, Peoples R China

关键词: Phenacoccus solenopsis;imidacloprid;organic silicon;chemical control;synergistic effect

期刊名称:TURKISH JOURNAL OF AGRICULTURE AND FORESTRY ( 影响因子:2.585; 五年影响因子:1.974 )

ISSN:

年卷期:

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收录情况: SCI

摘要: In this study, the effects of organic silicon (Si) on the toxicity of imidacloprid to a new invasive mealybug, Phenacoccus solenopsis (Hemiptera: Pseudococcidae), infesting Portulaca grandiflora (Caryophyllales: Portulacaceae) plants were evaluated using spotting and dipping methods under laboratory and field conditions to improve management strategies for solenopsis mealybug. Results showed significant synergistic effects of 0.06% organic Si with imidacloprid solution against third-instar P. solenopsis nymphs and adult females. However, the percentage mortalities increased remarkably after P. solenopsis was exposed to 100, 50, and 25 mg a.i./L of imidacloprid combined with organic Si. For the third-instar nymphs, these values increased to 100%, 100%, and 92.5%, respectively; for the adult females, these values increased to 100%, 100%, and 82.4%, respectively. After 5 days, the percentage mortalities reached 84.7%, 56.1%, and 39.7% when the third-instar nymphs were exposed to 100,50, and 25 mg a.i./L of imidacloprid solution, respectively. The percentage mortalities reached 57.5%, 38.9%, and 26.2% when adult females were exposed to the same imidacloprid solutions, respectively. Organic Si alone elicited toxicity to P. solenopsis. The percentage mortalities of the first-, second-, and third-instar nymphs and the adult females were 76.9%, 47.5%, 39.2%, and 18.9%, respectively. Field data showed that imidacloprid combined with organic Si caused sustainable control of P. solenopsis. The percentage mortalities of P. solenopsis reached maximum values (approximately 99.9%) after 21 days. Thus, the combined treatment with imidacloprid and organic Si is synergistically more effective than the individual use of these substances against third-instar P. solenopsis nymphs and adult females.

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