Fenbutatin, also known as Tolke, Krypton-Tin, Nguyen-Chenxi, and Fenbuxi, is a widely used acaricide in agricultural practices. It is available in various formulations such as 50% wettable powder (WP), 20%, 10%, and 25% fenbutatin wettable powders. Over 30 companies are registered with the Ministry of Agriculture's Institute of Drug Control, including Zhejiang Pharmaceutical Chemicals Co., Ltd., Shanghai Sakamoto Pharmaceutical Co., Ltd., Wuxi Jiabao Pharmaceutical Co., Ltd., Foshan Daxing Biological Chemical Co., Ltd. in Guangdong, and Zhejiang Huaxing Chemical Pesticide Co., Ltd., among others.
Fenbutatin is a long-acting acaricide that shows strong contact activity against spider mites. Its initial effect after application is slow, but its efficacy increases over time, reaching a peak around day 14 and maintaining effectiveness for up to 30 days or more. It is safe for crops and does not harm natural enemies or beneficial insects. It is suitable for controlling a variety of pests on fruit trees, vegetables, tea plants, cotton, and ornamental flowers. However, it is ineffective against quail eggs. The effectiveness of fenbutatin decreases significantly when temperatures fall below 22°C, so it should not be used in low-temperature conditions.
**Application Areas:**
1. **Fruit Tree Pests:**
- Controls citrus spider mites from April to May.
- Prevents citrus rust and protects fruit development.
- Manages red spider mites on apples and hawthorns.
- Use 10% EC at 500–800 times dilution, 25% wettable powder at 1000–1500 times, or 50% wettable powder at 2000–3000 times. Apply evenly, with an effective period lasting 1–2 months.
2. **Tea Plant Pests:**
- Controls tea orange wolfberry and tea short mash during non-harvest periods.
- Apply 50% wettable powder diluted 1500 times.
- Focus on the underside of leaves and lower parts of the tea bush for thorough coverage.
3. **Ornamental Plants:**
- Controls chrysanthemum and rose leafhoppers during infestation periods.
- Use 50% wettable powder at 1000 times dilution, applying evenly to foliage and leaves.
**Safety and Usage Guidelines:**
1. The acceptable daily intake (ADI) for fenbutatin is 0.03 mg/kg.
2. Maximum residue limits (MRLs) vary by crop: 5 mg/kg in citrus, 1 mg/kg in tomatoes, with a maximum concentration of 1000 mg/l.
3. For citrus, apply at least 14 days before harvest; for tomatoes, stop application 10 days prior to harvesting.
Always follow local regulations and safety instructions when using this pesticide to ensure both environmental and human health protection.
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