Other inorganic mercury compounds

Inorganic mercury compounds were historically employed as fungicides and bactericides due to their high reactivity with thiol (-SH) groups in proteins and enzymes of microorganisms.

The mechanism of action relies on the irreversible binding of mercury ions to sulfhydryl radicals of fungal cell enzymes, which blocks vital metabolic processes, including cellular respiration.

Because of this lack of specificity, mercury is extremely toxic not only to pathogens but also to beneficial soil microflora, causing severe disruption of the biological balance in the agroecosystem.

These substances possess the ability to accumulate in plant tissues and move through food chains, posing a long-term threat to human and animal health through contaminated crops.

Modern agronomy has almost completely phased out their use due to their high cumulative potential in the environment and the extreme danger they pose to warm-blooded organisms.

The primary historical application of these preparations involved the pre-sowing treatment of seeds (seed dressing) to protect them from a wide range of phytopathogens.

They were used to combat causative agents of smut diseases in grain crops, such as loose and covered smut, which infect the embryo and surface of the seeds.

They were also used to control various types of root rots and mold growth during seed storage and the initial stages of germination in the soil.

These compounds effectively inhibited the development of spore infections found both on the surface of the seed and under the seed coat, providing a long-lasting protective effect.

• Covered and loose smut of cereals
• Root rots (Fusarium and Helminthosporium species)
• Seed and seedling mold
• Bacterial seed-borne pathogens

The use of any inorganic mercury compounds in agriculture is officially banned or severely restricted in all developed countries under the Stockholm Convention.

Mercury is a persistent xenobiotic with extremely high bioaccumulation potential, making any release into soil or groundwater entirely unacceptable.

Handling these substances requires adherence to the strictest industrial safety measures, including the use of specialized respiratory protection and full chemical-resistant suits.

Disposal of remaining chemical stocks and treated waste must be performed exclusively by specialized facilities using strictly regulated chemical neutralization protocols.

Due to the persistence of mercury, soils previously exposed to long-term application of mercury-based pesticides require a lengthy rehabilitation period and continuous monitoring of metal residues in agricultural produce.