4.7 Article

Examination of acephate absorption, transport, and accumulation in maize after root irrigation for Spodoptera frugiperda control

Journal

ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 28, Issue 40, Pages 57361-57371

Publisher

SPRINGER HEIDELBERG
DOI: 10.1007/s11356-021-14689-6

Keywords

Acephate; Root irrigation; Maize; Control; Fall armyworm moth

Funding

  1. Research and Development Plan in Key-Area Research and Development Program of Guangdong Province [2020B020224002]
  2. National Key R&D Program of China [2018YFD0200305]
  3. Modern agricultural industrial technology System of Guangdong Province (The task of Innovation team building of key generic technologies in agricultural resources and environment) [2020KJ118]

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The study showed that root irrigation of acephate can more effectively control the infestation of fall armyworm in maize compared to foliar spraying. The translocation and distribution of acephate and methamidophos through root irrigation were more uniform, with higher control efficacy. This pest control method could reduce pesticide residues while safely and efficiently controlling fall armyworm infestation.
Since the invasion of the fall armyworm moth (Spodoptera frugiperda) in China in January 2019, damage to maize crops has gradually intensified, and chemical control has become the main control measure. This study aimed to examine methods of effective pest control while monitoring the environmental impact of pesticide use. The effectiveness of S. frugiperda pest control by foliar spraying and root irrigation of maize plants with acephate was determined, and the absorption, distribution, and dissipation of acephate and methamidophos by maize were studied. Field trials showed that acephate treatment at 6000 g a.i. ha(-1) was the most effective for controlling S. frugiperda. Acephate and methamidophos were absorbed from the roots, transported upward, and concentrated in the leaves, particularly new leaves. The terminal residues of acephate and methamidophos in maize grains were below detectable levels at 60 days after treatment. The results demonstrate that acephate treatment via root irrigation can more effectively control the infestation of S. frugiperda in maize than acephate treatment via foliar spraying. The translocation and distribution of acephate and methamidophos by root irrigation were more uniform, and the holding efficiency was higher than those in foliar spraying, suggesting an extended period of control efficacy. This pest control method could be utilized to reduce pesticide residues while safely and efficiently controlling S. frugiperda infestation.

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