Chlorothalonil, with the CAS number 1897 - 45 - 6, is a well - known and widely used chemical product. It appears as a white to off - white crystalline powder. The molecular formula of Chlorothalonil is C8Cl4N2, and its molecular weight is approximately 265.9 g/mol. It has a melting point ranging from 250 - 251°C and a boiling point of 350°C. Chlorothalonil is slightly soluble in water but is soluble in many organic solvents such as acetone, benzene, and toluene. It has a relatively low vapor pressure, which makes it stable under normal environmental conditions.
Chlorothalonil is primarily used as a broad - spectrum fungicide. In agriculture, it is an essential tool for farmers and growers. It can effectively control a wide range of fungal diseases in various crops, including vegetables (such as tomatoes, cucumbers, and peppers), fruits (such as apples, grapes, and strawberries), and grains (such as wheat and barley). By preventing and treating fungal infections, it helps to improve crop yield and quality, reducing losses caused by diseases. Besides agriculture, Chlorothalonil is also used in the wood - preserving industry. It can protect wood from decay caused by fungi, extending the service life of wooden structures such as poles, fences, and decks.
When using Chlorothalonil as a fungicide in agriculture, it is important to follow the proper application procedures. First, determine the appropriate dosage according to the type of crop, the severity of the disease, and the growth stage of the plants. Usually, it is formulated as a wettable powder, suspension concentrate, or emulsifiable concentrate. For foliar application, mix the product with water in the recommended ratio and spray it evenly on the leaves of the plants, making sure to cover both the upper and lower surfaces. It is best to apply the fungicide before the onset of the disease or at the early stage of infection for better efficacy. When using it in the wood - preserving industry, the wood can be treated by dipping, pressure - treating, or brushing. The treatment process should also follow the standard industry guidelines to ensure proper penetration and protection.
Case 1: Tomato Farm in California
A tomato farm in California was suffering from a severe outbreak of early blight, a common fungal disease caused by Alternaria solani. The farmer decided to use Chlorothalonil as a preventive measure. He applied a wettable powder formulation of Chlorothalonil at a rate of 1.2 kg per hectare, starting from the early growth stage of the tomatoes. By regularly spraying the fungicide every 7 - 10 days, the incidence of early blight was significantly reduced. The treated tomato plants showed healthy growth, and the yield was increased by 25% compared to the untreated plots. The quality of the tomatoes was also improved, with fewer blemishes and longer shelf - life.
Case 2: Wooden Fence in a Suburban Area
A homeowner in a suburban area wanted to protect a newly built wooden fence from fungal decay. He chose to use a Chlorothalonil - based wood preservative. He brushed the preservative onto the surface of the fence according to the product instructions. After three years, the treated fence showed no signs of decay, while an untreated section of the same fence had started to rot. This case demonstrated the effectiveness of Chlorothalonil in preserving wood.
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Este é o William, Diretor Executivo da Zhishang Chemical Co., Ltd.
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