Recently the APVMA released a permit (#13979) for the use of fungicides containing tebuconazole for the control of powdery mildew (Podosphaera fusca) in mung beans. The permit has been issued for use in NSW and QLD due to the emergence of this disease in Mung Beans, and there being a lack of registered control options.
Symptoms of Powdery Mildew usually include a grey-white cottony fungal growth on leaves, stems and pods. The disease can cause significant yield loss (up to 40%) if the fungus develops before or during the flowering period.
Spray schedules will vary from year to year depending on the weather, which influences the occurrence of powdery mildew. The GRDC has conducted trials in 2015/16 to test the effectiveness of tebuconazole, concluding that spraying should be done immediately when symptoms first occur for maximum affect, with a follow-up spray 14 days later highly recommended.