Crop is stunted in patches, no Herbicide used or any other foliar application. Adjoining field is quite healthy. Temperature is in between 5-15 degrees Celsius, foggy and moist condition exists. ..thanks
The symptoms you present are not consistent with manganese deficiency in wheat. It is consistent with fungal leafspot from a necrotrophic fungal species. The conditions you state are also consistent. To confirm the diagnosis the leaves are given to a plant pathologist who can keep the leaves in a moist chamber for the fungal fruiting bodies in the lesions which will give a preliminary diagnosis.
It is also similar to some leafspots caused by Pseudomonas pathovars. The described conditions are optimal for pseudomonad infection.
Kouadri Mohamed El Amine There was no Powdery formation on the leaves
Paul Reed Hepperly Alex Ignatov Farmers growing the same variety in the close vicinity was quite healthy and no such symptoms appear in any other field. Had it been a disease symptoms might have appeared in adjoining fields too..moreover, pattern and symptoms have almost 80% resemblance with Mn deficiency..
Please go through the attached link for further discussion..thanks
https://mtvernon.wsu.edu/path_team/Plant-Nutrient-Functions-and-Deficiency-and-Toxicity-Symptoms-MSU-2013.pdf
One more thing as Mn become less available during the cold temperature, there is transitional changes in temperature as now day by day temperature is going up..the recent emerged flag leaf do not have any such spots in same symptomatic plants..
Rupinder Singh "emerged flag leaf do not have any such spots in same symptomatic plants.." it is more typical for infection. You should consider all possible reasons, including infection. Dark margins around the spots are usual for disease, not for Mg deficiency. You are right that low temperature decrease Mg absorbtion by roots, but take in account that some diseases like viruses do the same.
Alex Ignatov I agree with you but there were no dark margin or any type of sporulation..I am also aware of Tan spots, septoria and Stagonospora and have carefully opted out them..thanks
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