The paper presents data on the peculiarities of the manifestation of diseases of fodder crops (spring barley, pea, spring rape) in the Trans-Urals under the influence of climatic changes. It has been established that the most common and harmful diseases of fodder crops are fusarium (root rot and wilting), ascochyta leaf blight and rust of peas, Alternaria blight and downy mildew of spring rape. The susceptibility of fodder crops to root rot and fusarium was more influenced by climatic conditions characterized by abrupt changes from a sufficient moisture regime to dry and arid conditions (correlation coefficient ranged from –0.92±0.23 to –0.96±0.28), and leafstem diseases (peas and spring rape) – with a sharp change of dry and arid conditions to satisfactory humidification (correlation coefficient ranged from 0.71±0.30 to 0.99±0.11). The yield of forage crops (spring barley, pea, spring rape) decreased with an increase in the plant susceptibility to fusarium and root rot, a close negative correlation was noted between the development of diseases and yield from –0.56 to –0.88. Leaf and stem diseases affected forage crops at the hydrothermal coefficient is greater than or equal to one. There was a close negative relationship between yield and the development of leaf and stem infections, the correlation coefficient ranged from –0.83 to –0.87.

Postovalov Aleksei A., Sukhanova Svetlana F.

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