Dimethomorph demonstrates excellent efficacy against downy mildew in high-value crops such as grapes, potatoes, tomatoes, cucumbers, and other vegetables. It is also widely used in cucurbit production and ornamental plants where oomycete diseases pose significant threats. The fungicide provides both protective and curative action, making it ideal for integrated disease management programs in these susceptible crops.

Dimethomorph belongs to the cinnamic acid amide fungicides (FRAC Group 40) and specifically targets oomycete pathogens like Phytophthora and Plasmopara. It inhibits cell wall synthesis in the pathogens by disrupting cellulose deposition, effectively stopping mycelial growth and spore formation. This unique mode of action makes it valuable for controlling resistant strains when used in rotation with other fungicide classes.

For optimal performance, Dimethomorph should be applied as a foliar spray using sufficient water volume (typically 200-400 L/ha) to ensure thorough coverage of all plant surfaces. Applications are most effective when made preventatively or at the very first signs of disease. In vineyards, special attention should be paid to covering the underside of leaves where downy mildew typically initiates. High-pressure spraying equipment with fine nozzles improves deposition in dense canopies.

Dimethomorph requires approximately 4-6 hours to become fully rainfast after application. The fungicide demonstrates good adhesion to plant surfaces, but heavy rainfall shortly after spraying may reduce efficacy, particularly on new growth that emerges post-application. In regions with frequent rains, adding a suitable adjuvant can improve retention and penetration of the active ingredient.

Dimethomorph shows excellent compatibility with most commonly used fungicides, insecticides, and foliar fertilizers. It is frequently combined with contact fungicides like mancozeb for broader protection or systemic products like fosetyl-aluminum for enhanced activity. However, compatibility should always be verified through jar testing, especially when mixing with alkaline products or those containing copper, which may reduce efficacy.