Chlorothalonil: An Effective Solution In The Control Of Fungal Diseases On Plant

Chlorothalonil is a synthetic organic compound belonging to the chloro nitrile chemical group. It was first developed in the 1960s and has since been widely used in agriculture due to its effectiveness in controlling fungal diseases.

1. Overview

• Chemical name: 2,4,5,6-Tetrachloroisophthalonitrile.

• Molecular formula: C₈Cl₄N₂.

• Molecular weight: 265.91 g/mol.

• Chemical group: Organochlorine compounds.

* Physical and chemical properties:

• Form: White or slightly yellow crystalline powder.

• Solubility: Insoluble in water, soluble in organic solvents such as acetone, methanol and benzene.

• Melting point: About 250°C.

• Stability: Stable under normal conditions but decomposes when exposed to light and high temperatures.

2. Mechanism of action

Chlorothalonil is a broad-spectrum fungicide, strong contact, high fungicidal effect, long lasting and less leaching, used to prevent many types of harmful diseases on crops. It works by inhibiting the enzyme glutathione reductase, disrupting the metabolism of fungal cells. Thereby, preventing the formation of spores and the growth of fungal mycelium.

* Toxicity:

• Toxicity to humans: Causes irritation to the skin, eyes and respiratory tract upon direct contact.

• Toxic to fish, aquatic animals (should not be used near water sources).

• Does not bioaccumulate but can decompose to form toxic products.

3. Applications

Chlorothalonil is used to prevent many types of fungal diseases such as anthracnose, downy mildew, powdery mildew, rust, brown spots, ... caused on leaves, stems and fruits of rice, vegetables, fruit trees, tea, crops and ornamental plants. 

4. Instructions for use

• Dosage: Varies from 0.5 - 2.5 kg/ha, depending on the crop and disease. 

• Application method: Foliar spray, periodic disease prevention spray. 

5. Safety notes

• Wear protective gear when using. 

• Do not spray in strong winds or near water sources. 

• Observe the safe waiting time before harvesting.  

• Avoid direct contact with the product. 

• If contact occurs, rinse with water immediately. 

• Store in a cool, dry place and out of reach of children