Font size: A A

0 1 2

Primadonna®, SE

2,4-D acid (in the form of 2-ethylhexyl ester) 200 g/l + florasulam 3.7 g/l

Selective postemergence herbicide of systemic effect intended to control annual and perennial bilobate weeds on cereal crop plantings.

General information


  • highly efficient two-component herbicide to protect spiked cereal crops against a wide range of bilobate weeds;
  • powerful herbicidal effect ensured by synergy of two active ingredients with various mechanisms of action;
  • exterminates malicious, difficult-to-eradicate weeds, such as catch weed, mayweed, Canadian thistle, yellow sow thistle, and others;
  • has a wide range of application timing: from cereal crop tillering stage to evolving into tube;
  • excellent systemic activity of the preparation allows easy and fast (within an hour) penetration into and spread within a weed, while blocking weed growing processes;
  • high rain resistance: precipitation does not affect its efficiency as early as an hour after treatment:
  • selective with regard to all types of cereal crops;
  • no crop rotation limitations;
  • compatible in mixes with gramicides, insecticides, fungicides and growth regulators.

Preparative form

Suspension emulsion containing 2,4-D acid (in the form of 2-ethylhexyl ester) 200 g/l + florasulam 3.7 g/l.

Keep the preparation in a room dedicated for pesticide storage. Storage temperature range - minus 10⁰C to plus 35⁰C. Stir before use.

Shelf life

2 years.

Hazard class

Class II, high hazard.


5 liter PE container


Schyolkovo Agrokhim JSC, Russia.


Schyolkovo Agrokhim JSC, Russia.


Mechanism of action

Florasulam inhibits biosynthesis of indispensable amino acids by inactivation of acetolactate synthase enzyme. 2.4-D contained in the preparation acts as an auxin like growth inhibitor. The preparation has a systemic effect and quickly (within 1 hour) penetrates into and spreads within all parts of weeds, including roots, thus blocking cell growth in young tissues.

Protective period

The duration of herbicidal effect depends on preparation dose, weather conditions, species sensitivity and weed age. The best result is achieved when treating 5-10 cm annual bilobate weeds and perennial weeds at rosette stage.

Speed of action

Weeds on plantings cease growing within a day after treatment. First signs of exposure become visible as early as in 3 or 4 days. Depending on weed kind and weather conditions, total extinction of weeds takes place in 2 or 3 weeks after treatment.

Range of inhibited weeds

Annual and perennial bilobate weeds.

Sensitive species: ragweed, Canadian thistle, yellow thistle, speedwell (species), pepper plant (species), charlock, black bindweed, bankweed, tansy mustard, common fumitory, yellow cress, satin flower (common chickweed), Tartarian lettuce, copper rose, pigweed, common dandelion, field sow thistle, rough sow thistle, houndsberry, caseweed, catch weed, wild radish, chamomile (species), amaranth (species), dish mustard, day-nettle species, and others.

Compatibility with other pesticides

Compatible with many herbicides for protection of cereal crops, including Granat, Fenizan, Zinger, Ovsugen Express, Ovsugen Super, and others, as well as with insecticides, fungicides, and agrochemicals. Before use, check the mix for compatibility and phytotoxicity with regard to the crop treated.

Potential for resistance

Florasulam inhibits formation of acetolactate synthase enzyme, and 2,4-D causes auxin type reaction. Such dual action of the herbicide reduce the risk of weed resistance.

Usage regulations

Crop / object of treatment

Harmful plants

Preparation consumption rate, kg/ha

Mix consumption rate, l/ha

Method, time and conditions of application.
Application time for manual (machinery assisted) operations

Wait time (application frequency)

Spring and winter wheat, spring barley

Annual weeds, including 2,4-D and 2M-4X resistant weeds, and some perennial bilobate weeds.



Planting spraying at crop tillering stage and earlier stages of weed growth. Winter crops are to be treated in spring.



Planting spraying at tube stage (1-2 internodes) and earlier stages of weed growth (considering sensitivity of sorts) where catch weed prevails, unless weather conditions dictated earlier treatment. Winter crops are to be treated in spring.

Application technique. Mix preparation method
Prepare the mix immediately before use. Fill the sprayer tank with water to 1/2 of its volume, slowly add the entire preparation dose while stirring, and rinse the container with preparation remainders several times with water. Pour water after rinsing the preparation container to the sprayer tank and top up with remaining water until full while continuously stirring. Stir continuously during treatment to ensure mix uniformity.
Prepare the mix and fill the sprayer on dedicated sites that are disinfected afterwards.
Commercially available ground-based boom sprayers intended for herbicide application shall be used for treatment purposes.
Sensitive to the herbicide are broad-leaved (bilobate) plants. Experiments did not show any damage to cereal crops.

Clients feedback

There is no comments from clients. You can be the first to comment this product.