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Weather patterns have gotten much warmer and drier over the past three weeks since the last report. As a result, overall weather patterns have not been very favorable to disease development in wheat but have favored high wheat yields statewide.
Fusarium scab has not been a major issue in Alabama wheat. This disease has developed in fungicide and cultivar screening trials at the Gulf Coast Research and Extension Center but has not been an issue at other research locations despite rains occuring at flowering. Leaf rust did appear late in some field wheat at GCREC but that disease has not appeared in cultivar or breeding line screening trials at other AAES outlying research units. In addition, strip rust, which is an occasional problem in the Tennessee Valley, also has not been observed in 2018.
Septoria leaf spot and Septoria leaf spot was observed at several location but damage, except at GCREC, was limited to the lower leaves. As a result, the impact of this disease on yield and test weights should also be low. Powdery mildew pressure was also low statewide.
Take-all root rot was diagnosted in wheat at the Tennessee Valley Research and Extension Center. This disease is an issue primarily in North Alabama where wheat follows wheat. As a result, the most effective control is rotation of wheat with other winter cover crops, particularly oats, legumes, or winter brassica's like tillage radish or turnips.
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