Herbicides Classification in Detail

1) On the basis of the application method

i) Soil applied herbicides: Herbicides sprayed to the soil operate on weeds’ roots and other subsurface portions. Fluchloralin, for example.

ii) Foliage applied herbicides: Herbicides that operate predominantly on plant foliage, such as glyphosate and paraquat.

2) On the basis of the mode of action

i) Selective herbicide: A herbicide is called selective when it kills some plant species while leaving others unharmed in a mixed plant growth. For example, atrazine

ii) Non-selective herbicide: It kills the majority of the treated plants. eg- paraquat

3) On the basis of mobility

i) Contact herbicide: A touch herbicide, such as paraquat, destroys plant portions with which it comes into close contact.

ii) Translocated herbicide/Systemic Herbicide: Herbicide that, depending on the nature of its molecule, moves from treated to untreated regions via xylem / phloem tissues. Glyphosate, for example

4) On the basis of application time

i) Pre-plant herbicide application: Herbicides are applied before the crop is planted or sowed. This location handles both soil and foliar application. Fluchloralin, for example, may be administered to the soil and integrated before planting rainfed groundnut, whereas glyphosate can be applied to the leaves of perennial weeds such as Cyperus rotundus before planting any crop.

5) Based on molecular structure:

Herbicide formulation:

Need for preparing herbicide formulation

• To have a product with physical properties suitable for use in a variety of types of application equipment and conditions.
• To prepare a product which is effective and economically feasible to use
• To prepare a product which is suitable for storage under local conditions?

Types of formulation