High efficacy Herbicide Ioxynil Octanoate

Jun 09, 2023

Herbicides play a vital role in modern agriculture by limiting the growth of harmful plants and weeds while protecting crops. One of the most effective herbicides on the market today is Ioxynil Octanoate.

Known for its high level of efficacy against a variety of challenging weed species, this herbicide is widely used on annual broadleaf weeds. This herbicide works by interfering with the enzyme system in plant cells, thereby disrupting metabolic processes. Herbicides are absorbed by leaves and transported through the plant system. Ioxynil Octanoate is available in liquid form.

Ioxynil Octanoate also has a long safety record and is approved for use in many countries around the world. In this blog post, we’ll explore the benefits and applications of Ioxynil Octanoate to give you a better understanding of this powerful herbicide.

The identity of Ioxynil Octanoate

Common name: ioxynil octanoate
IUPAC name: 4-hydroxy-3,5-di-iodobenzonitrile
CAS No.: 1689-83-4
Molecular formula: C7H3I2NO
Molecule structure

Ioxynil Octanoate

What is Ioxynil Octanoate used for?

Ioxynil Octanoate is a selective post-emergent herbicide widely used in agriculture to control broadleaf weeds. It is commonly applied to grains, onions, leeks, garlic, shallots, flax, sugar cane, pastures, lawns, and freshly seeded lawns because of its low toxicity to these plants.

The popular formulations of Ioxynil Octanoate are EC, and EW. And it is also often used in combination with other herbicides such as 2,4-D for extended control. The herbicide is absorbed by the plant’s leaves and travels to the roots, where it interferes with the plant’s ability to produce essential proteins. This causes the weed to grow slowly and gradually decline and eventually die.

What makes Ioxynil Octanoate particularly effective is its ability to target broadleaf weeds without harming the crop, making it a popular choice for farmers looking to control weeds while maintaining crop health and yield. Ioxynil Octanoate also has a low environmental impact, with a half-life of only a few days in soil and water.

Application of Ioxynil Octanoate

Ioxynil Octanoate is a photosynthetic electron transport inhibitor at the photosystem II receptor site and it can also uncouple oxidative phosphorylation. It is absorbed by the foliage, with limited translocation. It could control broadleaf weeds in onion, maize, sugarcane, etc. Due to the high price of Ioxynil Octanoate, it is normally used for onion and garlic.

Onion and Garlic Crops

To control broadleaf weeds in onion crops and Garlic, Ioxynil Octanoate is commonly applied as a herbicide during the pre-emergence stage. The pre-emergence stage means that the herbicide is applied before the crop plant has emerged from the soil (3 to 4 true leaves). This reduces the possibility of damaging the onion and Garlic plant while still targeting the weeds that may be present in the planting bed.

Onion and Garlic-ioxynil octanoate

For best results, Ioxynil Octanoate should be applied to crops during warm, moist conditions when the soil temperature is between 15℃ to 25℃. During this stage, the weeds are in a vulnerable state, and the herbicide can easily penetrate and control the weed population. The recommended dosage of Ioxynil Octanoate for onion or garlic crops varies according to the type and stage of growth. The herbicide is generally applied using a backpack sprayer, tractor-mounted sprayer, or hand-held spray bottle.


Ioxynil Octanoate can also be used in the control of broadleaf weeds on maize crops.

three-leaf to four-leaf of maize

Pre-Emergence Application

Ioxynil Octanoate can be applied before the maize plant has emerged as a pre-emergence herbicide. This type of application is beneficial when there is a high level of weed pressure in the field and can be applied using a backpack sprayer, hand-held spray bottle, or a tractor-mounted sprayer.

To prepare the field for Ioxynil Octanoate application, it is necessary to clear the planting bed of debris such as plant residues, rocks, and soil clods. The application of Ioxynil Octanoate should be done when the soil is slightly moist and shortly before or after planting the maize. This significantly increases the effectiveness of the herbicide.

Post-Emergence Application

The herbicide can be applied post-emergence, depending on the weed pressure and growth stage of the maize.

The timing of post-emergence application is crucial to ensure the herbicide targets young weed seedlings. The recommended application timing for Ioxynil Octanoate on maize crops is when the maize plants are at the 2 to 4 leaf stage, and the weeds are at the cotyledon to the 2 to 3 leaf stage.

Ioxynil Octanoate is also used as a herbicide for weed control on sugarcane crops. The herbicide is used at different stages of sugarcane growth to target specific weed species at different growth stages.

Sugarcane crops

ioxynil used in sugarcane

Pre-emergence is when the herbicide is applied before the sugarcane plant has emerged. Pre-emergence application of Ioxynil Octanoate on sugarcane crops can be done either before or after planting. The herbicide is typically applied at a dosage of 1.0 to 2.0 liters per hectare.

Pre-emergence application of Ioxynil Octanoate is usually recommended when the weed population is prevalent, and there is a need to control the weed population before sugarcane emergence. Weed control through the pre-emergence application is known to provide long-lasting weed control.

Precautions and Risks

It is important to take note of the precautions and risks that come with the application of Ioxynil Octanoate to crops, including onion and garlic. The herbicide can be harmful to non-target organisms, particularly pollinators such as bees. Before applying Ioxynil Octanoate, it is essential to read and follow the instructions on the label carefully. Protective equipment such as gloves, goggles, and a respiratory mask should be worn while applying the herbicide to avoid exposure.

The residue level of Ioxynil Octanoate in the crops must be monitored, and the prescribed harvest wait period should be observed before harvesting the crop. During the harvest period, it is advised to wash the crop thoroughly to remove any remaining residues before consumption.


When used in accordance with label directions and best practices, Ioxynil Octanoate can be an effective tool in ensuring high yields and quality products. However, necessary precautions must be taken to avoid any potential risk and hazard to non-target organisms and the environment.

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