Whey

Whey belongs to the category of biological plant protection products, with its efficacy based on creating a specific microenvironment on the leaf surface. The active components include a complex of lactic acid bacteria and lactic acid, which inhibit the development of pathogens.

When applied to plants, whey forms a thin, breathable film on the leaf surface. This film acts as a physical barrier that prevents fungal spores from germinating and penetrating into the leaf tissues.

Additionally, whey alters the pH level on the surface of the leaf blade, creating an environment unsuitable for the survival of many types of phytopathogens. Acidification of the environment is a key factor in halting fungal infection outbreaks.

Whey contains amino acids, vitamins, and trace elements that, when applied to a plant, have a mild stimulatory effect. This contributes to strengthening the crop's own immune system and activating photosynthetic processes.

Unlike systemic chemical pesticides, whey acts exclusively by contact and does not penetrate into the plant's vascular system. This makes it a safe tool within the framework of integrated crop management.

Whey is most effective against a wide range of powdery mildew fungi (family Erysiphaceae). It is actively used to control powdery mildew on cucumbers, tomatoes, zucchini, and berry crops.

The product also demonstrates suppressive effects against certain types of late blight during the early stages of development. It prevents rapid disease spread under weather conditions favorable to the fungus.

Beyond direct fungicidal action, the product is used to combat various leaf spot diseases caused by imperfect fungi. Regular treatments reduce the risk of epiphytotics in vegetable gardens.

Whey application in orchards helps combat apple and pear scab, preventing massive infection of fruit and leaves. The product is particularly in demand during periods when the use of aggressive chemicals is undesirable.

Additionally, a positive effect is noted in the control of some aphid species, as the film complicates their respiration and feeding on young shoots.

To prepare a working solution, whey is typically diluted with water at a ratio ranging from 1:5 to 1:10, depending on the disease development stage and the crop. To improve adhesion, a small amount of mild liquid soap is often added.

Treatments are carried out in the evening or early morning, away from direct sunlight, to avoid leaf burns and rapid drying of the protective film. The frequency of procedures is every 7–10 days throughout the growing season.

In cases of high disease pressure, the interval between sprayings is reduced to 3–5 days. The product should be applied preventively before the first signs of mass disease appearance on the leaves.

Special attention during spraying should be paid to the underside of the leaf, as this is where the primary reproductive centers of many pathogens are located. It is important to ensure thorough coverage of all above-ground plant parts.

There is no pre-harvest interval required, as the product is a food component and does not pose a toxic risk to humans.

The main limitation is that efficacy is dependent on weather conditions. Heavy rainfall quickly washes away the protective film, requiring the agricultural operation to be repeated.

When using concentrated solutions, there is a risk of localized leaf tissue burns, especially when treating in hot, sunny weather. Preliminary testing on a small, limited area is recommended.

Whey does not have long-lasting residual effects, which necessitates frequent repeated treatments. This makes it less efficient on large-scale production areas compared to industrial fungicides.

The product is incompatible with most systemic chemical fungicides, as lactic acid may alter their chemical composition and reduce biological activity.

Long-term storage of the working solution is not recommended, as fermentation processes develop rapidly, which can change the environment's reaction and reduce effectiveness against target pathogens.