Researchers from the CIMMYT international center have identified that wheat is susceptible to a variety of pathogens, including 25 fungal diseases, 3 bacterial infections, 1 viral disease, 3 nematode-related diseases, 4 physiological and genetic disorders, and 8 conditions linked to deficiencies in mineral nutrients or other abiotic factors. Although the pathogens that affect both winter and spring wheat are generally similar, there are occasional differences in specific instances. Wheat is frequently affected by four different forms of smut, three types of rust, powdery mildew, septoria leaf blotch, and helminthosporium leaf lesions, along with a range of root rot conditions. Additionally, the crop is vulnerable to bacterial infections, yellow mold or slime mold diseases, basal disorders, and a number of viral infections (Prescott et all., 1986; Koishybaev, 2002; Dubeiller, Singh et all, 2014).
Table 2 - Disease spectrum of spring wheat and their pathogens, affected plant organs
|
Disease |
Pathogen(s) |
Affected plant organs |
|
Loose smut |
Ustilago tritici |
entire ear |
|
Common bunt (Stinking smut) |
Tilletia caries, T. levis |
spikelets |
|
Ergot |
Сlaviceps purpurea |
grains |
|
Stem rust |
Puccinia graminis f. sp. tritici |
stems, glumes, leaves |
|
Leaf rust (Brown rust) |
Puccinia recondita f. sp. tritici |
leaves |
|
Powdery mildew |
Erysiphe graminis |
leaves, stems, glumes |
|
Septoria leaf blotch |
Stagonospora nodorum Septoria tritici |
leaves, stems, glumes |
|
Tan spot (Yellow leaf spot) |
Drechslera tritici repentis |
leaves, stems |
|
Root rot - Helminthosporium type |
Bipolaris sorokiniana (syn. Helminthosporium sativum) |
primary and secondary roots, stem internodes |
|
Root rot - Fusarium type |
Fusarium spp. |
primary and secondary roots, stem internodes |
|
Black point |
Alternaria alternata, B. sorokiniana |
grain, seeds |
|
Wheat streak mosaic |
Triticum virus |
leaves |
|
Mucilaginous or yellow bacterial blight |
Rathayibacter tritici |
leaves |
|
Basal bacterial disease |
Pseudomonas syringae pv. atrofaciens |
leaves |