Magnesium hydroxide

Magnesium hydroxide is an inorganic compound utilized in agricultural practices as an active substance with fungicidal and antiseptic properties. It is often classified as a contact-type fungicide that provides an effective environmental barrier against fungal pathogens on the leaf surface without causing significant phytotoxicity.

The mode of action of magnesium hydroxide is primarily based on creating an alkaline micro-environment on the plant tissue. This elevation of pH levels disrupts the enzymatic activity required for the germination of fungal spores, effectively stopping the development of mycelium. It acts as a preventative measure rather than a systemic treatment, inhibiting the spread of infections.

The primary application involves controlling powdery mildew on various crops, including greenhouse vegetables, vines, and ornamental plants. Beyond its fungicidal activity, the substance provides a supplemental source of magnesium, an essential nutrient for chlorophyll synthesis. This secondary effect supports plant recovery and enhances photosynthetic activity during the growing season.

Application instructions require precise dosage to ensure the leaf surface is coated without creating excessive alkalinity that could interfere with nutrient absorption. It is best applied during early morning or late afternoon to maximize the duration of effectiveness on the leaves. Consistent coverage is crucial for performance, as the material must be physically present on the target surface to act.

Safety precautions for users include wearing standard protective equipment, such as gloves and eyewear, to avoid irritation. It is essential to avoid mixing magnesium hydroxide with strongly acidic fertilizers or pesticides, as such interactions will neutralize the compound and degrade the solution's efficacy. The product should be kept in a cool, dry environment to maintain its chemical integrity.