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SE Nebraska | I've worked with this for several years and have some thoughts. A fungicide recommendation that works in South Dakota generally will not be relevant in Kansas. Not that Their recommendation is wrong, the environments and disease pressures are vastly different. I've seen a nice yield response with a V5/early application. I recommend this almost exclusively on rain fed acres. The disease pressure late in the year is generally less than irrigated so a tassel aerial application may not be warranted. Year in, year out the best roi is the at tassel application. I see bigger yield response in Southern Nebraska than Northern also. If you are in an area where Tar Spot is an issue, I might back off from the early application a bit. It is only legal to apply 2 applications of the common fungicides used in corn, it doesn't matter if you switch brands/companies. It is a resistance management strategy. With tar spot hanging on so late in the growing season, I would apply a tassel treatment and then want to have one left if an R3 application was needed. If tar spot is not a concern, doing the early season app will generally pay back, a tassel application also does. Doing both is generally not cumulative. If on average we see 7 bushels increase from a V5 only application and 14 bushels from a tassel only treatment, applying both doesn't mean you will get 21 bushels. To explain it plainly, you can only pull the strobilurin yield response trigger one time in a corn plant's life. | |
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Corn fungicide timing
