Copper-containing fungicides differ in content and particle size. Dribbling contains much finer particles compared to others, which ensures better adhesion to the plant, therefore it remains longer on the surface of the leaf. When the particles get wet, they generate copper ions that kill bacteria and prevent the reproduction of fungal spores. Large particles, such as those contained in Bordeaux mixture for example, cannot provide complete coverage and are easily washed away by rain. Accordingly, the smaller the particle size, the greater the number of particles per 1 kilogram and the greater the fungicidal or bactericidal activity.
Over the years, the use of preparations containing a large amount of copper leads to its accumulation in the sample, which subsequently has a negative effect on the plant. The low rate of consumption is especially noteworthy for organic farms that are limited in the use of copper-containing fungicides allowed in one season. And copper is actually irreplaceable against such diseases as: bacterial diseases, leaf rust, spotting, powdery mildew, etc.
Therefore, it is necessary to use a fungicide that has a low consumption rate due to small particles and will not lead to the accumulation of excessive amounts of copper in the soil.
For more information on these and other topics, see Agrocompany Baraka’s YouTube channel – https://www.youtube.com/@baraka.georgia2230