Isoproturon 75% WP Herbicide Uses

Isoproturon 75% WP is a selective herbicide from the substituted urea chemical class, registered for use in India under the Insecticides Act, 1968 and sold under various trade names including Shivron and Result. It is used almost exclusively in wheat, applied to control key grass and broad-leaved weeds. Isoproturon remains legally registered and sold in India; always confirm the current pack label before use. This page lists its mode of action, key benefits and the recommended dosage as per manufacturer labels.

Mode of Action

Isoproturon is a substituted-urea herbicide that inhibits photosynthesis by blocking electron transport at Photosystem II inside the weed's chloroplasts. This stops the target weed from converting light energy into usable chemical energy, halting its growth and eventually killing it. Isoproturon acts principally after root absorption from the soil, though it is also taken up to some extent through leaves, and can be used both as a pre-emergence treatment (applied to the soil before weeds emerge) and as an early post-emergence treatment (applied to young weed seedlings), depending on the label directions and field conditions. Because wheat is naturally tolerant to isoproturon at labelled rates while susceptible grass and broadleaf weeds are not, it provides selective weed control without harming the crop.

Features & Benefits

• Selective control of major wheat weeds — Phalaris minor (littleseed canarygrass), Avena fatua (wild oat) and Poa annua (annual meadow grass) — without harming the wheat crop.
• Flexible timing, usable as a pre-emergence or early post-emergence treatment depending on field conditions.
• Effective, well-established option specifically against Phalaris minor, a major yield-limiting weed in wheat across North Indian wheat belts.
• Root-zone (soil) absorption gives reliable activity even under variable spray-coverage conditions.

Recommended Usage of Isoproturon 75% WP Herbicide

The table below gives the commonly recommended dose and water volume per acre, as listed on manufacturer labels for this active ingredient. Always confirm against the current product label before use, including the correct application timing relative to sowing.

Doses above are the commonly listed formulation-label rate for Isoproturon 75% WP in wheat, rounded to practical spray-tank quantities. Always confirm the current pack label/CIB registration for the correct application timing (pre-emergence or early post-emergence) and consult your local agricultural extension office for the latest guidance.

How to Use

1. Confirm the correct application timing from the current product label — isoproturon is typically applied either as a pre-emergence treatment shortly after sowing, or as an early post-emergence treatment when weeds are still small (2–3 leaf stage), depending on the specific label and field history.
2. Make a thin paste of the required quantity in a small amount of water, then dilute this gradually into the full spray tank volume while stirring continuously so the wettable powder disperses evenly.
3. Spray using a knapsack or power sprayer fitted with a flat-fan nozzle, ensuring uniform coverage of the soil surface (for pre-emergence use) or of young weed foliage (for post-emergence use).
4. Ensure adequate soil moisture at the time of application, as isoproturon acts principally through root uptake and needs moist soil for good activity.
5. Avoid spraying if heavy rain is expected shortly after application, as this can wash the herbicide out of the target zone and reduce weed control.

Precautions & Safety

• Wear appropriate PPE — mask/respirator, gloves, goggles and full-sleeved clothing — while mixing and spraying, and avoid inhaling the wettable powder dust while opening the pack.
• Apply only in the labelled crop (wheat) and at the correct crop stage; isoproturon is not selective in most other crops and can cause serious injury if drift or residue reaches a sensitive follow-on crop.
• Store in the original, tightly closed container in a cool, dry place away from direct sunlight, food, feed and out of reach of children and livestock.
• Follow your local agricultural extension advice on pre-harvest interval and any rotational crop restrictions before planting a different crop in the same field.
• Isoproturon shares a single mode of action (Photosystem II inhibition) with several other herbicide groups; avoid repeated, back-to-back use of the same mode of action on the same field across seasons, and rotate herbicide groups as part of a resistance-management program, since resistant Phalaris minor populations are already documented in parts of India.
• Wash hands, face and any exposed skin thoroughly with soap and water after handling or spraying, and change out of contaminated clothing before eating, drinking or smoking.