By Pierce Paul, Ohio State University Extension plant pathologist
What should I spray for scab and vomitoxin control? With the addition of Miravis Ace (a new DMI + SDHI premix) to the list of fungicides recommended for the control of Fusarium head blight (head scab) and vomitoxin in wheat and barley, questions are being asked as to whether it is any better than Prosaro and Caramba. In 2018, we compared the three fungicides on scab susceptible varieties across 12 environments and found that in terms of efficacy against head scab and vomitoxin, Prosaro, Caramba, and Miravis Ace were very comparable. Disease severity, vomitoxin contamination, and fungicide efficacy varied among locations, but on average, all three fungicides reducing scab by about 55-60% and vomitoxin by approximately 50-55%.
When should these fungicides be sprayed for scab control? Another commonly asked question about Miravis Ace pertains to its efficacy when applied at early heading (Feekes 10.3).… Continue readingRead More »