Overview
Omethoate is an organophosphate insecticide and acaricide that belongs to the phosphorothioate chemical family. It is the oxygen analog of dimethoate and shares similar pesticidal properties. In tea cultivation, omethoate is primarily used to control sucking pests such as tea green leafhoppers and mites that can significantly damage tea quality and yield. The use of omethoate in tea production is controversial due to its high toxicity and potential health risks. Many countries have established maximum residue limits (MRLs) for omethoate in tea, typically ranging from 0.05 to 1 mg/kg. Some markets have banned or severely restricted its use.
Physical and Chemical Properties
Omethoate is a colorless to pale yellow liquid at room temperature with a mild ester-like odor. It is stable under normal conditions but decomposes when heated above 135°C. The compound is miscible with water and most organic solvents including alcohols, ketones, and aromatic hydrocarbons. Chemically, omethoate is an organophosphate ester that readily hydrolyzes in alkaline conditions. Its systemic action allows it to be absorbed by plants and translocated to untreated parts. The compound acts as a cholinesterase inhibitor in pests and mammals, disrupting nerve function.
Main Applications
In tea production, omethoate is primarily used against tea green leafhoppers (Empoasca vitis), tea aphids (Toxoptera aurantii), and spider mites that commonly infest tea bushes. Its systemic action makes it effective against hidden pests that conventional contact insecticides might miss. Beyond tea, omethoate is used in cotton, fruits (especially citrus), vegetables, and ornamental plants. It controls a broad spectrum of sucking and chewing pests including aphids, thrips, whiteflies, and leaf miners. Application methods include foliar spraying and soil drenching.
Safety and Storage
Omethoate is classified as highly toxic (WHO Class Ib). Exposure can occur through inhalation, skin contact, or ingestion. Symptoms include headache, nausea, blurred vision, muscle twitching, and in severe cases, respiratory failure. Always use proper PPE including gloves, goggles, and respirators when handling. Store omethoate in original containers in a locked, well-ventilated area away from food, feed, and water sources. Keep away from heat and open flames. Containers should be clearly labeled and disposed of according to local regulations. Never store near alkaline materials which can accelerate decomposition.
B2B Procurement Guide
When sourcing omethoate for tea production, verify the manufacturer's certification and product purity (typically 70-90% for technical grade). Check compliance with the destination market's regulations - some importers require certificates of analysis and GLP residue studies. Consider the pre-harvest interval (PHI), typically 7-14 days for tea. Bulk buyers should negotiate pricing based on volume, with discounts often available for quantities above 1 ton. For export-focused tea producers, alternative pesticides with lower MRLs may be preferable to avoid trade barriers.
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