Question

Dichloral urea is used as a

• A. Soil herbicide for pre emergence treatment
• B. Soil herbicide for post-emergence treatment
• C. Soil nematicide for pre emergence treatment
• D. Soil fungicide for post emergence treatment

Hint:

Pre-emergence soil herbicides require adequate soil moisture to activate the chemical and form a barrier layer that kills germinating weed seeds.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
Herbicides are chemical formulations used to suppress or kill undesirable vegetation.
They are classified by their mode of application (foliar/soil) and timing of application relative to crop/weed emergence.

Step 2: Detailed Explanation:
- Dichloral urea (DCU) is a chlorinated urea derivative.
- It is applied directly to the soil as a selective herbicide prior to the germination/emergence of weed seedlings (pre-emergence).
- It acts by inhibiting early root development and cell division in emerging weed seedlings, making it effective for weed control in crops like sugar beets.

Step 3: Final Answer:
Dichloral urea is classified as a soil herbicide for pre-emergence treatment.