HPM Waada Oxyfluorfen 23.5% EC Selective Contact Herbicide for Pre & Post-Emergence Weed Control

HPM Waada is a broad-spectrum selective contact herbicide containing Oxyfluorfen 23.5% EC (Emulsifiable Concentrate). It is designed to control a wide range of annual grasses, sedges, and broadleaf weeds in crops like paddy (rice), groundnut, onion, tea, cotton, vegetables, and fruit orchards. Waada works effectively as both a pre-emergence and early post-emergence spray, creating a chemical barrier on the soil surface that stops weed seeds from germinating and kills young weeds on contact.

This herbicide belongs to the Diphenyl Ether chemical group and acts as a Protoporphyrinogen oxidase (PPO) inhibitor. It is absorbed rapidly by weed foliage and shoots with very little translocation within the plant. One of its unique features is sunlight activation — the chemical triggers the release of active oxygen molecules when exposed to sunlight, which burst weed cell walls and cause rapid drying and death (desiccation). This makes Waada especially effective on sunny days.

HPM Waada offers residual activity that provides extended weed control, reducing the need for frequent manual weeding and helping farmers save on labor costs. It is selective in action, meaning it targets weeds without harming the main crop when used correctly. The product is classified as WHO Class U (Unlikely Acute Hazard), making it relatively safe for handlers when proper precautions are followed. It is available in pack sizes including 50 ml, 100 ml, and 250 ml.

Key Benefits

• Stops weeds before they grow: Acts as a pre-emergence shield, killing weed seeds and seedlings as they try to sprout from the soil.
• Broad-spectrum control: Effectively controls annual grasses (like Barnyard grass, Crabgrass), sedges, and many broadleaf weeds (like Eclipta alba, Pigweed, Bathua) in one application.
• Extended residual activity: Provides prolonged weed control, reducing the need for repeat sprays and saving time and labor.
• Reduces manual weeding costs: Minimizes dependence on expensive and hard-to-find manual labor for weeding, improving farm profitability.
• Safe for subsequent crops: Does not affect the yield of follow-on crops, making it a reliable choice for crop rotations.
• Weather resistant: Binds tightly to soil particles and works effectively in both wet (paddy) and dry field conditions without easily washing away.
• Improves crop yield: By reducing weed competition, the crop gets better access to nutrients, water, and sunlight, leading to healthier growth and higher yields.

How It Works

HPM Waada works through a unique light-activated mechanism. It is a Protoporphyrinogen oxidase (PPO) inhibitor belonging to IRAC Group E. When sprayed, the chemical forms a thin layer on the soil surface or coats the foliage of emerged weeds. The active ingredient, Oxyfluorfen, is rapidly absorbed by the shoots and foliage of weeds but has very little movement (translocation) within the plant.

The key to its effectiveness is sunlight activation. When the treated weed or weed seedling is exposed to sunlight, the chemical triggers the release of active oxygen molecules (free radicals) inside the weed cells. These oxygen molecules attack and destroy the cell membranes, causing the weed tissues to break down. This leads to rapid drying, wilting, and death of the weed — a process called desiccation. Because this mode of action depends on light, Waada works best on clear, sunny days. As a contact herbicide, it kills only the parts of the weed it directly touches, so thorough and uniform spray coverage is essential for best results.

Technical Specifications

Recommended Dosage & Application

Note: For foliar application, use 258 to 430 ml per acre. Always follow the dose per acre for accurate results. Mix the liquid well with clean water before spraying. Avoid using muddy water as it can reduce effectiveness.

When to Use

HPM Waada is most effective when applied during the pre-emergence or early post-emergence stage of weed growth. The ideal timing depends on the crop:

• Rice (Paddy): Apply within 0 to 3-4 days after transplanting or sowing. This pre-emergence window is critical — the herbicide must be applied before weeds emerge from the soil for maximum effectiveness.
• Groundnut: Use as a blanket soil application at the pre-emergence stage, before weed seeds germinate.
• Onion, Tea, and other crops: Apply as a pre-emergence spray soon after sowing or transplanting, or as an early post-emergence spray when weeds are small and actively growing.

For best results, apply on a sunny day as the herbicide requires sunlight for activation. Avoid application when heavy rain is expected immediately after spraying. The product works effectively in both wet (paddy) and dry field conditions.

Step by Step Usage Instructions

1. Prepare the spray solution: Fill the spray tank with clean water. Add the recommended dose of HPM Waada as per the crop and weed type. Mix thoroughly to ensure uniform dispersion.
2. Check water quality: Use clean water only. Avoid muddy or turbid water as it can reduce the effectiveness of the herbicide.
3. Spray uniformly: Apply the mixture evenly over the soil surface using a knapsack sprayer or power sprayer. Ensure complete and uniform coverage so the chemical forms an unbroken layer on the soil.
4. Timing is key: For pre-emergence use, spray immediately after sowing or transplanting (within 0-4 days). For early post-emergence, spray when weeds are small and actively growing.
5. Post-application care: Do not disturb the soil after spraying as it may break the chemical barrier. Avoid entering the treated area until the spray has dried.
6. Clean equipment: After spraying, thoroughly wash all application equipment with clean water. Do not dispose of wash water near water bodies or wells.

Precautions & Safety

• Personal Protective Equipment (PPE): Always wear gloves, a mask, and goggles while handling and spraying the herbicide.
• Avoid contact: Do not inhale the spray mist or allow the chemical to come into contact with skin, eyes, or clothing.
• Hygiene: Wash hands and face thoroughly with soap and water after handling the product. Do not eat, drink, or smoke while spraying.
• Storage: Store in a cool, dry place away from food, animal feed, and drinking water. Keep out of reach of children and pets.
• Environmental safety: Avoid spray drift onto neighboring crops, water bodies, or non-target areas. Do not contaminate ponds, rivers, or irrigation channels.
• Disposal: Do not reuse empty containers for any purpose. Dispose of them safely as per local regulations.
• Regional restriction: This product is restricted in Kerala State. Farmers in Kerala must follow state-specific regulations.

Side Effects & Phytotoxicity

Avoid spraying directly on the leaves of young sensitive crops as contact may cause injury. The product is safe for labeled crops (Rice, Groundnut, Onion, Tea, etc.) when applied before crop seedlings emerge or as a directed spray. Always follow the recommended dosage — over-application may cause crop stress or damage.

PHI / REI & Storage

PHI (Pre-Harvest Interval): Refer to the product leaflet for crop-specific pre-harvest interval days.