Chempa

Introduction

Chempa Herbicide (Pyrazosulfuron-Ethyl 70% WDG) is a selective, systemic herbicide formulated as a water-dispersible granule (WDG) containing 70% pyrazosulfuron-ethyl, a sulfonylurea herbicide that acts as an inhibitor of acetolactate synthase (ALS), an enzyme essential for the biosynthesis of branched-chain amino acids (BCAAs) in plants. By disrupting BCAA synthesis, pyrazosulfuron-ethyl disrupts protein synthesis and plant growth, leading to plant death.

Active Ingredient and Mode of Action

The active ingredient in Chempa Herbicide (Pyrazosulfuron-Ethyl 70% WDG) is pyrazosulfuron-ethyl, a synthetic sulfonylurea herbicide that mimics the natural amino acid sulfometuron methyl. When absorbed by susceptible weeds, pyrazosulfuron-ethyl binds to ALS, an enzyme responsible for the first step in BCAA synthesis. This binding inhibits ALS activity, preventing the synthesis of BCAAs, which are essential for protein synthesis and other cellular processes. Without BCAAs, plants are unable to produce proteins, leading to stunted growth, chlorosis (yellowing), and eventually, plant death.

Crop Applications

Chempa Herbicide (Pyrazosulfuron-Ethyl 70% WDG) is widely used on a variety of crops, including:

Cereals: Rice, wheat, barley
Non-crop areas: Fallow fields, roadsides, industrial sites
Plantation crops: Rubber, tea, oil palm

Application Methods

Chempa Herbicide (Pyrazosulfuron-Ethyl 70% WDG) can be applied as a foliar spray or a soil drench.

Foliar spray: Mix the recommended dosage of Chempa Herbicide (Pyrazosulfuron-Ethyl 70% WDG) with water and apply it to the leaves of weeds until they are thoroughly wet.
Soil drench: Mix the recommended dosage of Chempa Herbicide (Pyrazosulfuron-Ethyl 70% WDG) with water and apply it to the soil around the base of weeds.

Dosage Rates

The recommended dosage rate of Chempa Herbicide (Pyrazosulfuron-Ethyl 70% WDG) varies depending on the target weed, crop, soil type, and application method. Consult the product label for specific dosage instructions.

Precautions

When handling and applying Chempa Herbicide (Pyrazosulfuron-Ethyl 70% WDG), follow these precautionary measures to ensure safety:

Wear protective clothing, including gloves, goggles, and a respirator.
Avoid contact with skin and eyes.
Do not apply the herbicide in windy conditions.
Wash hands thoroughly after handling the product.
Dispose of empty containers responsibly.
Avoid using near water sources or aquatic habitats.
Do not use on bees or other beneficial insects.

Storage and Shelf Life

Store Chempa Herbicide (Pyrazosulfuron-Ethyl 70% WDG) in a cool, dry place, away from direct sunlight and heat. When stored properly, the product has a shelf life of two years.

Conclusion

Chempa Herbicide (Pyrazosulfuron-Ethyl 70% WDG) is a versatile and effective herbicide that provides broad-spectrum control of a wide range of broadleaf weeds in various applications. Its selective action and long-lasting residual activity make it a valuable tool for weed management programs. However, it is important to use Chempa Herbicide (Pyrazosulfuron-Ethyl 70% WDG) responsibly and in accordance with label instructions to minimize potential risks to human health and the environment.