Quelex Complex Pak - Quelex (florasulam, halauxifen methyl) + Naceto (diflufenican, flufenacet)

Quelex Complex Pak combined with Naceto - herbicide for winter and spring cereals

What are the benefits of using the Quelex Complex and Naceto plant protection product set for weed control?

• Effectively controls unwanted weeds including resistant blackgrass,
• Only one treatment is needed to enjoy a weed-free field,
• Very fast action - results visible within a few hours,
• Does not threaten subsequent crops,
• Convenience - both Quelex and Naceto are available as concentrates.

Quelex Complex and Naceto Pak are plant protection products manufactured by Corteva from the herbicide group.

Both Quelex and Naceto are selective herbicides.

Quelex has systemic action and is applied foliar. It is available in granule form for preparing a water suspension (WG).

Naceto is applied soil or foliar and is available as a concentrate in the form of a concentrated suspension for dilution with water (SC).

The combination of these products effectively controls both monocotyledonous and dicotyledonous weeds.

What is the content of active substances in the Quelex herbicide?

• Florasulam (a compound from the triazolopyrimidine group) - 100 g/kg (10%),
• Halauxifen methyl – Arylex™ (a compound from the aryloxyphenoxy group) – 104.2 g/kg
  (10.4%),
• Hazardous substances not classified as active substances: cloxyquintocet.

What is the content of active substances in the Naceto herbicide?

• Diflufenican (a compound from the phenoxynicotinoanilide group) – 200 g/l (16.26%),
• Flufenacet (a compound from the oxyacetamide group) – 400 g/l (32.52%).

How does the Quelex herbicide work on winter and spring cereals?

The product is absorbed through cotyledons and leaves. It then quickly moves throughout the plant. It contains two active substances with different modes of action. This complementary effect increases the herbicide's efficacy.

The active substance halauxifen methyl belongs to the aryloxyphenoxy group and is classified as a growth regulator (also known as synthetic auxins). Florasulam is an active substance from the triazolopyrimidine group belonging to the acetolactate synthase (ALS) inhibitor group. In the plant, halauxifen methyl disrupts cell division, while florasulam inhibits branched-chain amino acid synthesis, leading to disturbances in protein biosynthesis.

How does the Naceto herbicide work?

The product contains two complementary biologically active substances with different modes of action.

The active substance diflufenican is a contact herbicide (with limited translocation within the plant), classified as an inhibitor of carotenoid biosynthesis in weed cells. The lack of these structures causes leaf tissue bleaching and cell breakdown, especially visible in new tissues.

After application, diflufenican remains on the soil surface for an extended period, forming a thin layer that acts contact-wise on emerging young, actively growing weeds. Diflufenican provides protection for up to 8 weeks after application.

The active substance flufenacet is a systemic herbicide classified as a long-chain fatty acid synthesis inhibitor. It is mainly absorbed through roots and the area below the cotyledons of germinating weeds.

Diflufenican and flufenacet remain active in the soil for many weeks after treatment, maintaining high herbicidal efficacy also in later periods.

How do weeds behave after applying Quelex?

After treatment, sensitive weeds stop growing, followed by leaf and stem deformities and chlorosis leading to necrosis and weed death. The fastest herbicidal effect is achieved when applied to weeds in early growth stages during active growth. Visual symptoms appear within a few days to several weeks after treatment, depending on the weed species. Very sensitive weeds, e.g., cleavers and red dead-nettle, are controlled even in advanced growth stages.

What is the sensitivity of weeds to the Quelex herbicide?

Weed sensitivity to the product applied in autumn, mixed with an adjuvant, from one leaf stage to the end of tillering in winter cereals (BBCH 11-29) - dose 37.5 g + adjuvant:

• Sensitive weeds: chickweed, cleavers, volunteer oilseed rape,
• Resistant weeds: field violet.

Weed sensitivity to the product applied in spring, mixed with an adjuvant, from the beginning of tillering to the second node stage in winter cereals (BBCH 21-32) - dose 50 g + adjuvant:

• Sensitive weeds: cornflower, fumitory, chickweed, red dead-nettle, pink dead-nettle, corn poppy, scentless mayweed, field forget-me-not, field larkspur, cleavers, scentless chamomile, common chamomile, volunteer oilseed rape, shepherd's purse, common shepherd's purse, field pennycress,
• Resistant weeds: field violet, Persian speedwell, ivy-leaved speedwell.

Weed sensitivity to the product applied mixed with an adjuvant from the beginning of tillering to the second node stage in spring cereals (BBCH 21-32) - dose 50 g + adjuvant:

• Sensitive weeds: fumitory, red dead-nettle, common lambsquarters, scentless mayweed, cleavers, field bindweed, field pennycress.

How to apply the Quelex herbicide?

The product can be applied within a wide air temperature range (from 2 to 25°C), at low or high air humidity. Prolonged drought may reduce herbicidal efficacy. Rainfall occurring 30 minutes after treatment does not reduce efficacy.

The product should be applied together with the recommended adjuvant (a supporting agent), which promotes better uptake and thus increases herbicidal effectiveness. The adjuvant should also be used under unfavourable conditions for herbicide action, i.e., during drought, low temperatures, low air humidity, and on weeds in late growth stages.

The product is intended for use with self-propelled or tractor-mounted field sprayers.

Detailed information on dosage and application of the Quelex plant protection product can be found in the "Dosage" section and in the plant protection product label attached in the downloadable files.

How to apply the Naceto herbicide?

Optimal soil moisture favours high product efficacy.

The best herbicidal effect is achieved by applying the product in early weed growth stages, during germination or shortly after emergence, at the seedling stage.

The product is for use with self-propelled or tractor-mounted field sprayers.

Detailed information on dosage and application of the Naceto plant protection product can be found in the "Dosage" section and in the plant protection product label attached in the downloadable files.

In which crops can the Quelex and Naceto Pak be used?

• Winter and spring wheat,
• Winter and spring triticale,
• Winter and spring rye,
• Winter and spring barley.

What is the pre-harvest interval when using Quelex and Naceto Pak in winter and spring cereals?

The pre-harvest interval, i.e., the period from the last application to the day of crop harvest, does not apply to either Quelex or Naceto.

Can Naceto be used on weeds without risk to subsequent crops?

The product does not pose a threat to subsequent crops. If it is necessary to destroy a treated crop earlier due to frost, pests, or diseases, after 3 months and ploughing the field, spring wheat, spring barley, potatoes, and maize can be grown.

What are the recommendations when using spray liquid prepared with Quelex?

• Do not apply the plant protection product:
  − to plants weakened by nutrient deficiencies, including
  micronutrients,
  − to plants damaged by diseases, pests, frost, drought,
  − after night frosts and before expected frosts,
  − to plants covered with frost,
  − in cereals with legume undersowing,
  − in oats and cereal mixtures containing oats,
  − when air temperature is below 2°C or above 25°C.
• During application, avoid:
  − drift of spray liquid onto neighbouring crops and areas adjacent to the sprayed area,
  − overlapping spray liquid on the edges of treatment strips and headlands.

More information can be found in the attached label in the downloadable files.

What are the recommendations when using spray liquid prepared with Naceto?

• Mild winters accelerate the breakdown of active substances, shortening the product's action period in spring.
• Do not apply the product:
  – in cereals with legume undersowing,
  – to plants under stress, weakened or damaged by frost, drought, pests, or diseases,
  – immediately after large temperature fluctuations between night and day as temporary yellowing of crops may occur,
  – on waterlogged soils,
  – during windy conditions that may cause spray drift onto neighbouring crops.
• During application, avoid:
  – drift of spray liquid onto neighbouring crops,
  – overlapping spray liquid on the edges of treatment strips and headlands.
• Recommended working pressure: 2-4 bars. Distance of boom from field surface: 50-60 cm

More information can be found in the attached label in the downloadable files.

We invite you to learn more about using Quelex and Naceto plant protection products on the Agricultural Advisor website:

• Expand your knowledge about herbicides,
• Learn more about weeds.
• Read agricultural announcements.

Warning! Plant protection products must be used safely. Before each use, read the information on the label and product information.

The buyer declares that they meet the conditions specified in Article 25 paragraph 3 point 5 of the Act of 8 March 2013 on plant protection products and has training in the use of plant protection products in the case of products for professional users. Before each use, read the information on the label and product information. Pay attention to detailed risk indications. Follow the safety rules contained in the label. Plant protection products may only be purchased by adults and persons who have completed training and have the qualifications required for persons purchasing plant protection products (Article 28 of the Act on plant protection products of 8 March 2013 as amended). Plant protection products must be used in a way that does not pose a threat to human health, animals, or the environment. The buyer of plant protection products must be sober. By using this offer, you declare that you meet the above conditions.