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| Thats a good photo. I am quite confident that those are the perithecia (fruiting bodies) of tan spot, I see a lot of those in the Central Plains in wheat following wheat rotations, especially in no-till systems. These perithecia release ascospores in the spring and splash onto the next crop during rainfall, causing oval or irregular lesions on the leaves. These lesions can stress the plant at the same stage as the wheat is determining the number of spikelets per head, so yield losses can be significant.
The big question is the yield response to early fungicide applications. With $10 (+) wheat, it only takes 1/2 bushel of wheat to pay for the early fungicide. If its a variety with below average tan spot resistance (Jagalene, 2137, Fuller, 2174 etc), it may increase the yield by 3-5 bu, especially if you have good moisture.
If you have tan spot on the residue, you should start to see it on the wheat plants by now, especially if its going to be a significant problem early. Attached is a photo of tan spot later in the season.
Where are you in the panhandle? and do you have moisture, now?
Phil
www.needhamag.com
Edited by Phil N 2/25/2008 23:48
 (Tan spot on wheat plant.jpg)
Attachments
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 Tan spot on wheat plant.jpg (95KB - 97 downloads)
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Wheat Question?
