Greater burdock (aerial parts)

The active substance derived from the aerial part of the greater burdock belongs to the class of natural phytopreparations with significant antifeedant and inhibitory activity. The raw material contains sesquiterpene lactones, essential oils, tannins, and organic acids, which collectively affect the physiological processes of pests.

The plant protection mechanism involves creating a physical and biochemical barrier that interferes with the feeding and development of harmful organisms. When applied to the aerial parts of plants, the extract's components disrupt the metabolism of insect pests, reducing their fertility and mobility.

The fungicidal activity of the preparation is attributed to the presence of natural antibiotic compounds, such as arctiin and arctigenin. These substances inhibit the growth of fungal mycelia, preventing their spread across the leaf surface of agricultural crops.

Additionally, burdock-based preparations act as boosters for the host plant's natural immune system. This activation occurs through the stimulation of phenolic compound synthesis and increased activity of enzymes responsible for stress resistance.

The action is characterized by both systemic and contact effects. Once deposited on the leaf surface, the active molecules are gradually absorbed, providing prolonged protection against secondary fungal spore infestation or pest damage.

The preparations in this group are primarily used against a wide range of leaf-eating and sucking insects, including various aphids, spider mites, and lepidopteran larvae. They effectively reduce pest populations at the early stages of infestation.

In a phytopathological context, the agent is used to combat powdery mildew and gray mold affecting vegetable and fruit crops. An inhibitory effect on the development of various rust diseases has also been observed.

The application area includes protected agriculture (greenhouses), where chemical pesticide use is restricted due to frequent harvesting requirements. The preparation shows good efficacy in controlling late blight in the early stages of symptom development.

The agent is frequently used in organic farming to manage viral pressure. While burdock has no direct effect on viruses, it effectively destroys vectors such as aphids and whiteflies, thereby limiting the spread of viral diseases.

The preparation can be used for treating seeds and seedlings before planting. This preventive measure reduces the risk of soil-borne infections and facilitates faster root establishment for young plants under field conditions.

Working solutions are prepared from concentrated extracts or decoctions of dry aerial biomass. The standard concentration ranges from 0.5% to 2%, depending on the level of infestation and the biological stage of the target organism.

Spraying should be conducted during morning or evening hours to avoid rapid evaporation of active ingredients due to UV exposure. It is recommended to maintain an interval of 7 to 10 days between treatments to ensure consistent concentrations on the leaf surface.

Pre-harvest intervals for phytopreparations are minimal, allowing applications during the fruit ripening period. However, potential changes in product taste should be considered if dosage levels are excessively high.

Compatibility testing is required when used in tank mixtures. It is recommended to combine the treatment with natural stickers to enhance the resistance of the preparation against wash-off due to rainfall.

Thorough coverage of the leaf surface is a key condition for efficacy. Even, fine-droplet spraying ensures maximum contact with the pest or pathogen, which is critical for contact-action biopreparations.

A primary limitation is the dependence of efficacy on weather conditions. High humidity and frequent rainfall can reduce the concentration of the preparation on the plant, necessitating re-treatment, which may not always be economically viable.

The preparation does not possess high toxicity to humans; however, when handling concentrated extracts, it is recommended to use basic personal protective equipment such as gloves and safety goggles to prevent mucous membrane irritation.

When storing the working solution, avoid direct sunlight, as active substances like sesquiterpene lactones are prone to photodegradation. The storage life of a prepared mixture in a cool, dark place should not exceed 24 hours.

It is not recommended to exceed the stated application rates, as this may lead to phytotoxicity in young crops. Sensitive plants may react to an excess of essential oils with stunted growth or marginal leaf burns.

To prevent the development of pest resistance, it is recommended to rotate burdock preparations with other bio-insecticides or fungicides that possess a different mechanism of action against pathogens or pests.