WS/T 832-2024
Technical standards for chemical mosquito control (English Version)

Standard No.

WS/T 832-2024

Language

Chinese, Available in English version

Release Date

2024

Published By

Professional Standard - Hygiene   CN  /  WS

Latest

WS/T 832-2024

Introduction

Analysis of the core framework of the standard

Target of prevention and control	Key technology	Typical pesticides	Persistent period
Mosquito larvae	Constant spraying/granular spreading	Dimethoate, Pyriproxyfen	2-6 weeks
Adult mosquitoes	Space spray/residual spraying	Deltamethrin, Cis-Cypermethrin	3-6 months

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Key points of technical implementation

1. Control of mosquito larvae

For large and medium-sized water bodies, it is recommended to use a knapsack sprayer for regular spraying. Attention should be paid to the following during operation:

• The spreading dosage of pyriproxyfen GR formulation should be controlled at 1-5mg/m²
• Methyl pirimiphos EC formulation should be used for sewage ditch treatment
• The control cycle should be shortened to the conventional 50-70%
during the rainy season

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2. Space spraying of adult mosquitoes

【Post-disaster epidemic prevention case】

During the flood disaster in southern China in 2023, vehicle-mounted ultra-low volume spraying was used for treatment:

1. Choose 5% highly effective chlorpyrifos EW formulation
2. Apply at a rate of 0.5L/ha
3. Operate at dusk every day
4. Mosquito density decreased by 82% within 3 days

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Strategies for insecticide resistance management

Mechanism of action	Representative agents	Rotation cycle
Sodium channel inhibitors	Deltamethrin	≤6 months
Acetylcholinesterase inhibitors	Propoxur	≤12 months

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Analysis of Standard Evolution

Main upgrades compared with the 2012 version:

• Added hedge spraying method to control Aedes albopictus
• Detailed the list of 7 types of appendix pesticides
• Specified the frequency of pesticide resistance monitoring (at least twice a year)