When should triazole fungicides be applied?
Triazoles may be applied preventively or as early-infection treatments. When applied as an early-infection treatment, applications must be made early in the fungal infection process. Some triazole fungicides have anti-sporulant properties, which means they inhibit spore production and therefore help to slow disease development. However, if a fungus begins to produce spores on an infected plant, triazole fungicides are then not effective. Where do triazole fungicides move in the plant and how long do they last? Although the triazoles don’t have the degree of systemic movement of many herbicides, they are locally systemic and more mobile in plant tissues than QoI fungicides. Following application, the active ingredient is readily taken up by leaves and moves within the leaf. Studies have shown that three droplets of a labeled rate of triazole fungicide applied to a soybean trifoliate leaf covered the entire leaf within one day. Note, however, that triazole fungicides are not necessarily
