Understanding Quizalofop-P-Ethyl: The Technology Behind BASF and Winall’s New Rice System in China

15 April 2026, Beijing: The launch of BASF and Anhui Winall High-Tech Seed Co., Ltd.’s Provisia® Herbicide-Tolerant Rice System in China has brought fresh attention to quizalofop-p-ethyl, a herbicide chemistry now being adapted for a new role in rice production. While the commercial rollout is gaining momentum this year, the news first broke in December last year, when the companies announced the system in Hefei, Anhui.

At its core, the development is significant because it combines herbicide chemistry with seed technology. Instead of relying only on a spray product, the system links quizalofop-p-ethyl with specially bred rice hybrids that can tolerate the herbicide while surrounding grassy weeds are controlled. This creates a new weed management option for farmers, especially in direct-seeded rice systems where weed pressure is often severe.

What is Quizalofop-P-Ethyl and How Does It Work?

Quizalofop-p-ethyl belongs to the aryloxyphenoxypropionate (FOP) group of herbicides and is widely known as a post-emergence solution for grassy weed control in broadleaf crops such as soybean, cotton, pulses and vegetables. It is absorbed through the foliage of target weeds and moves within the plant to growing points.

Its mode of action is based on inhibiting the enzyme acetyl-CoA carboxylase (ACCase), which is essential for fatty acid synthesis. Once this process is blocked, plant growth stops, cell membranes cannot develop properly and susceptible weeds gradually die. Because grasses depend on this pathway, the herbicide has been highly effective on many troublesome grass weeds.

Why Rice Needed a Different Approach

Conventional rice, however, is also a grass species. That is why quizalofop-p-ethyl could not normally be sprayed over standard rice fields without damaging the crop itself. This has long limited the use of the chemistry in rice farming, despite its strong grass-weed control potential.

The challenge is even greater in direct-seeded rice (DSR), where rice seed is sown directly into the field rather than transplanted. In these systems, crop plants and weeds emerge at the same time and compete immediately for nutrients, moisture, sunlight and space. Weedy rice, which closely resembles cultivated rice, becomes especially difficult to control. Farmers often depend on costly manual weeding or limited herbicide options.

How the Provisia Rice System Changes the Equation

The new system addresses this challenge by combining BASF’s Provisia herbicide, containing 300 g/L quizalofop-p-ethyl, with herbicide-tolerant rice hybrids Quanyou 822 and Huiliangyou 898. These varieties are bred to withstand recommended applications of the herbicide, while susceptible grassy weeds are controlled.

This creates practical advantages in the field. Farmers can establish the crop through direct seeding and then apply the herbicide after emergence to reduce weed competition during the most critical growth stages. The approach can help lower labour dependence, improve crop stand establishment and support more efficient farm management. BASF has also indicated that the product’s residual profile supports flexibility for crop rotation and subsequent planting decisions.

Sustainability and Production Benefits

The wider importance of the system goes beyond weed control. Direct-seeded rice is increasingly discussed as a way to reduce labour requirements, lower water consumption and cut greenhouse gas emissions compared with conventional puddled and transplanted rice systems. Where water scarcity and labour shortages are rising concerns, such systems can offer economic and environmental value at the same time.

By integrating crop genetics with herbicide chemistry, the launch reflects a broader direction in global agriculture: complete production systems rather than standalone products. Farmers are looking for solutions that combine productivity, resource efficiency and easier management in one package.

What Comes Next

As with any herbicide technology, long-term success will depend on stewardship. Over reliance on a single mode of action can lead to herbicide resistance, making integrated weed management essential. Crop rotation, clean seed, timely scouting and diversified weed control practices will remain important alongside chemical tools.

For now, the China launch marks an important technical milestone. It shows how an established herbicide such as quizalofop-p-ethyl can gain new relevance when paired with modern breeding technology. If successful at scale, the model could influence future weed management strategies in rice-growing regions around the world.

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