chemical fungicide的意思|示意

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Chemical fungicide is an important class of pesticides used to control plant diseases caused by fungi, bacteria, algae, or other micro-organisms. Chemical fungicides are divided into two categories: contact and systemic. Contact fungicides act by coming into direct contact with the infectious organism, while systemic fungicides are absorbed by the plant and spread throughout the whole system, and can affect a wide range of organisms.

Contact fungicides work by killing the infectious organisms upon contact, while systemic fungicides are designed to move through the plant’s tissue and travel within the plant to reach the root of the organism. Therefore, systemic fungicides are more effective in controlling fungal diseases, because they can kill the organism even if it has not yet been identified.

The most common type of chemical fungicides used to control plant diseases are synthetic chemicals, such as organochlorines, phenols, fungicidal alcohols, and fungicides based on copper, sulfur, and boron. These fungicides work by either killing the pathogen directly, or by inhibiting its growth and reproduction.

In general, it is important to read the label instructions carefully before using a chemical fungicide, as different products may have different instructions for use, and the amount of product needed may vary depending on the severity of the disease. Also, it is important to apply the fungicide correctly, because if the fungicide is improperly applied, it may do more harm than good. Lastly, it is important to rotate fungicides on a regular basis to prevent resistance.