What is the primary use of Dacthal in horticulture?

Dacthal, also known scientifically as DCPA (Dichloroacetic acid), is primarily used in horticulture as a pre-emergent herbicide. Its main function is to control certain annual grassy weeds by preventing their seeds from germinating and sprouting. This is essential for maintaining healthy crop and plant growth, as unwanted weeds can compete for nutrients, water, and light, which may hinder the development of desired plants.

In the context of the other provided options, while enhancing photosynthesis, attracting beneficial insects, and promoting overall plant growth are important aspects of horticulture, they are not the primary function of Dacthal. Instead, Dacthal specifically targets weed control, making it an important tool in integrated pest management (IPM) strategies to ensure that plants can thrive without the competition posed by weeds.