About 1/4 of field was affected by white heads symptoms. What can it be? Temperature range was high: 5 (night) - 30oC (day) within 4 last weeks.
Dear prof. Ignatov,
These symptoms in the photos may not be a reaction to temperature. It is probably a viral disease of cereals (Barley yellow dwarf virus - BYDV) which attacks species of the family Poaceae. Have you considered this option?
The viruses are transmitted by aphids migrating from winter hosts that became infected on grasses or winter grain infected in the previous year or from grasses and cereals on which they overwintered.
Typical symptoms of the infestation are golden yellow to orange leaf color and growth retardation (dwarfism). Yellowing progresses from the tips and edges of the leaves and gradually affects the entire leaf blade. Dwarfism of plants is associated with deformations of leaves and leaf blades, reduction of above-ground and underground biomass, ...
Best regards,
BS
Bozena Sera Dear Bozena,
So far, the symptoms are found in several places, and I suspect that it can be some virus or bacteria. But, most of extention service staff prefer to claim that it was pesticide or temperature change effect. I have never seen symptoms like this.
Best
Alex
Dear prof. Ignatov,
yes, you are right, it will be a phytopathogenic disease rather than a stress response. It probably corresponds to viral attack, as evidenced by the colored spots on the leaf blades (upper photo) and the twisting of the generative organs. Also, the occurrence of symptoms in several places corresponds to the disease, not a reaction to temperature or pesticide exposure.
It takes time and targeted analysis.
Good luck,
BS
• Dryland root rot (also known as dryland foot rot). This disease, caused by the Fusarium fungus, causes white heads and often turns the base of the plants pinkish. As with take-all, dryland root rot causes all the tillers on an infected plant to have white heads. This disease is usually most common under drought stress conditions, and is often mistaken for either drought stress or take-all.
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